EMR Corp ensures only the highest quality radio frequency products leave our facility, and has been designing, supporting and manufacturing high frequency radio equipment for over 34 years. ii) Tuning the Duplexer. BNC connectors are standard. Generically, filter of this kind are known as notch filters. The analyzer noise floor doesn't show the bottom of the notch very well. Tuning one of these takes considerably longer than even a multi-cavity duplexer assembly, and it's much more involved. Juan - November 7, 2017 Wath is the difference on the duplexer you show on the video and the big duplexer ? I have reapeter 442. UHF Duplexer 4201-C6 utilize six high-Q notch-type coaxial resonators with 1”-cross-section that results in small geometry advantages without compromising duplex isolation. BP-BR Duplexer Tuning: Initial on Bench vs In Service John #173336. ) Product Narrative. RB04 - Output 433. Free Frequency Tuning - send me the high / low frequency. These repeaters are identical to the CDR700 and GR300 the only difference is the housing, the GR500 housing has a larger power supply and larger fan for continuous duty operation. When tuning the duplexer, you will want to adjust each loop individually to set the insertion loss. 950MHz and have "capacitive shorts" between input and output connectors to place a rejection notch at the transmitter frequency of 144. connect a … Continue reading Duplexer tuning 3920B →. If you want a quality duplexer and no desense, look no further. Duplexer Tuning with the Freedom Communications System Analyzer 3 element or path being tested. Only female BNC is available. Providing quality-assurance inspection equipment for food and pharmaceutical products, we effectively meet the desire for promoting health. Learning how to tune an antenna entails lengthening or shortening the antenna so that, for the radio's. I get GREAT notches but LOUSY loss. com with top-selling Uhf Duplexer brands. You may have to register before you can post: click the register link above to proceed. Furthermore, magnetic tuning is introduced to improve isolation in case of practical imbalances. The definition of the tuned radio frequency, TRF receiver is a receiver where the tuning, i. Tuning the duplexer: If you have taken the leap to build your first repeater, let me personally say congrats and thank you. dbSpectra manufactures Transmitter Combiners, Receiver Multicouplers, Duplexers, Filters, Antennas and Tower Top Amplifiers as well as legacy Decibel Products Land Mobile Radio (LMR) site management equipment. Tunable Bandpass and Bandreject filters provide the best solution for pre-tuning desired signals while rejecting interfering signals. Save on Other Ham Radio Equipment. UHF Duplexer ‐ Tuned 406‐500 MHz (N‐female 4‐8 MHz spacing) All duplexers have female type "N" connectors. Our state-of-the-art RF filters lead the industry for size, performance, cost and time to market. Their M/2 category short story…. This duplexer resonators are made from 1"5/8 helical coaxial cable. The cavities use N connectors and thick LMR400 type cable, and are about twenty years old. What is a duplexer? A duplexer is a three port filtering device which allows transmitters and receivers operating at different frequencies to share the same antenna. The Monitor side is hooked to the other port. Parameter Specification Remark DL 2110 ~ 2170MHz Insertion Loss 0. Current version is Windows only but i'm working on a linux/mac version. 5 dB TX noise suppression at RX (typ) 70 dB at 600 KHz RX isolation at TX (typ) 70 dB at 600 KHz VSWR (max) 1. duplexer chip with out tuning and with tuning for diff erent center frequencies. Duplexer, Q-Circuit, Res-Lok, 4 cavity, rack mount, 220-225 MHz 220 to 225 MHz Q2222. Try using a low-pass filter on the output of a delay. Tuning one of these takes considerably longer than even a multi-cavity duplexer assembly, and it's much more involved. Qorvo's family of RF filters includes duplexers, diplexers, triplexers, quadplexers and discrete RF filters, giving designers the flexibility to choose between discrete single-band building blocks and integrated multiband filtering. On the low side of the duplexer I get a great notch at 467. These repeaters are identical to the CDR700 and GR300 the only difference is the housing, the GR500 housing has a larger power supply and larger fan for continuous duty operation. Baby & children Computers & electronics Entertainment & hobby. Diagnose and fix repeater desensitization 21 January, 2007. All duplexers are tuned and tested with customer-specified frequencies prior to shipping. A "tee" junction and two more cables connects the two branches with the antenna feed line. Comet CF-4160N - 1. Identified and solved over-heating issue from high power challenge. Duplexer Tuning is additional labor charge. Wilson CB antennas offer silver-plated copper wire for superior power and the broadband antenna allows for easy tuning. About A low cost UHF/VHF duplexer The resource is currently listed in dxzone. 110 frequency in 1997, it made a scraping noise as the knobs were turned. A duplexer are designed to be transmitted into with high power when correctly tuned and using low power while tuning are absolutly complety safe. Calibrated RF indicator such as a network analyzer or spectrum analyzer, with sensitivity of at least 80 dB below the RF generator output. Instructions. 8 Minimum Isolation < 80 dB RF Connectors < N Female Item Width < 19 in Item Length < 17 in Item Height < 4. Duplexer Tuning: see pages 222-227 of the HP 8920B Applications manual. The item “U/V UHF VHF dual band spectrum analyzer BNC with tracking source tuning Duplexer” is in sale since Friday, January 05, 2018. 075 40 watts , heliax coax 1/2 with duplexer like you show on video. RFS 450-470 MHz mobile duplexer. 50W UHF 6 Cavity N-connector Duplexer for UHF Duplexer Kenwood 485Mhz SGQ-450D See more like this. Then the BridgeCom BCD-UHF Combiner Duplexer is perfect for your application. The duplexer exhibits an isolation from Tx to Rx of greater than 60dB. In any case, how a duplexer operates is basic physics. UHF Duplexer Project The motivation here is to save the installation of a cable within the home. With analyzer you can see difference of high and lo quality capacitors and. Skyworks offers ceramic coaxial line elements in seven sizes and four dielectric constants to span applications from UHF Frequencies up to 6 GHz. This is for a uhf duplexer that needs tuning on your frequency. I commonly hook my signal generator to the antenna port and send one of the frequencies into the duplexer. For frequency division duplex (FDD) applications, no duplexer is perfect and, therefore, some part of transmit (Tx) wideband noise spills into the receive (Rx) band and becomes part of the noise budget. 3 Duplexer tuning using RLB Return to ApNote TOC ! "#$%& 1. As the cutoff frequency of the delay component is reduced, you should expect to hear a more ‘realistic’ spatial separation between the direct signal and the delay. The receiver side tuned to notch out the transmitter frequency. Fiplex Public Safety Centric DAS is the evolution of the traditional Broadband RF over Fiber DAS, improving. Alternative Multi-band Solution Granite State Antenna -- Northwood, NH -- 603-731-0710 -- [email protected] Each BCR Repeater includes FREE Programming! Please include TX/RX Frequency, PL Tone In/Out, Station ID, Desired Transmit Output Power within the Special Instructions during checkout. Duplexer, and power supply. Instead, please coil and ziptie the pigtail out of the way. CF-706 Comet Duplexer $125. A Duplexer passes transmitter power at one frequency while preventing it from reaching a receiver tuned to a different one. 550, at somewhere around -80. To facilitate our customer's time-to-market, our design services for Electronic Hardware & Firmware, Mechanical and Software solutions, enable fast and swift prototyping. When the bias on a pin diode is varied, the microwave resistance changes from a typical value of 6 kilo-ohms under negative bias to about 5 ohms when the bias is positive. The analyses and tuning of these circuits are a skilled task that requires highly accurate RF measurement equipment in the hands of a skilled professional. NanoVNA Recently this NanoVNA product popped up on my radar, and like normal, I was a bit behind the group in discovering it. A tunable differential duplexer in 90nm CMOS. Our BAW and SAW technologies are instrumental in enabling the next generation of wireless and mobile products, particularly in RF bands with the most. A consideration when using a duplexer is that the DC voltage for tuning the ATAS-100 is supplied through the HF pigtail. Frequency Range: 144-174 MHz. UHF (400-470 MHz) - 40 Watts Continuous Duty. A Duplexer passes transmitter power at one frequency while preventing it from reaching a receiver tuned to a different one. 38 dB / 102 dB isolation) Placed duplexer back. A "tee" junction and two more cables connects the two branches with the antenna feed line. xxx and not the /exact/ frequency? I would like to hop between frequencies as I travel without having to pull out a duplexer for each pair. Fit for Motorola Repeater Enclosurer. Most of us don't have a service monitor or a scope that can go up to VHF/UHF bands, so we need to look at other alternatives. PA7N miniVNA. I'll let you know how the duplexer works when it is reinstalled back on the mountain. Each BCR Repeater includes FREE Programming! Please include TX/RX Frequency, PL Tone In/Out, Station ID, Desired Transmit Output Power within the Special Instructions during checkout. A duplexer is divided into a transmit and receive section. RF splitter, combiner and duplexer. is a worldwide recognized designer and manufacturer of highly innovative telecommunication products focused on providing solutions to Public Safety and Mission Critical applications. Antenna Tuning Units; Antenna Wire; Baluns; Components; Dummy Loads; Duplexers & Triplexers; Guy Rope; Lightning Arrestors; HF+6m and VHF/UHF duplexer. Tuned Duplexers (for use with standard repeater) ‐ Must Specify Frequency for Tuning. - Duplexer Tuning Guide This is a great reference guide for a volunteer fireperson, sheriff posse officer, ham operator, EMS or Rescue personnel… Note: Although we tested the unit, we do not guarantee the test under any circumstances. Price list effective as of October 1, 2019. The cursor points to the step: the number keys directly input or the up and down keys to adjust the step change in 5K scan range will be slightly changed to fit the size of the grid. "Our aim is usually to give superior quality items at aggressive rates, and top-notch company to clients around the earth. I hold my opinion that it is a very good duplexer for just $91. PASS-REJECT CAVITY AND DUPLEXER TUNING TEST EQUIPMENT MINIMUM REQUIREMENTS: 1. The duplexer uses phasing and phase-shifting to steer the PA's output power to the antenna while blocking it from the LNA input, to avoid overload and saturation of the sensitive LNA input. Duplexer, Base Station Pass Notch 806 - 960 Mhz; IsoPlexer (Pass Notch Duplexer w/ Isolators) IsoPlexer (Pass Notch Duplexer w/ Isolators)144 - IsoPlexer (Pass Notch Duplexer w/ Isolators)300 - IsoPlexer (Pass Notch Duplexer w/ Isolators) 440; IsoPlexer (Pass Notch Duplexer w/ Isolators) 806 - IsoPlexer (Pass Notch Duplexer w/ Isolators) 894 -. Our vector network analyzer and signal generator are calibrated semi-annually to NIST traceable standards with. The high frequency section of a duplexer is designed to be tuned to the higher frequency whether that happens to be either the transmit frequency or the receive frequency. 6-225MHz LPF/340-1000MHz HPF HAM Antenna Combiner VHF UHF Transit Station Duplexer 5. One filter provides a path between the transmitter and the antenna, the other provides a path between. 143 results for vhf duplexer Save this search. How does it work? + Post New Thread. Motorola XPR8400 UHF Repeater 48watt 450-512MHZ wi. Figure 15 shows the parts and optimized layout design of the duplexer. Duplexer Tuning/Performance The procedure used to tune the duplexer is as follows: 1. That is to say they work best at a single frequency. selectivity is provided by the radio frequency stages. Series Notch Duplexer Tuning Instructions General Overview The S27-XX-06 is a Series Notch style duplexer which offers notch isolation characteristics at the appropriate Tx-Rx split for the specific band. 6 Cavity 25W UHF Two Way Radio Duplexer SGQ-889 SL16/UHF-M Connector Specifications: 25W RF power Handling 6 cavity Design Maximum Tx and Rx frequency difference: UHF 10Mhz Power Isolation >75dB Power loss <1dB Nominal impedance: 50 V. Using an 8mm wrench, loosen the tuning lock screws that hold the four tuning rods in place. A circulator is sometimes called a "duplexer", meaning that is duplexes two signals into one channel (e. I found that approximately 0. Search for an RCX01-A39 Duplexer. You can "check" the tuning on a duplexer with a decent antenna analyzer (you really need one that can graph a SWR plot…which throws out most if not all of the MFJ analyzers). 00, 100 to 150 miles $350. Shipping to 98052: Items in search results. The duplexer provides enough attenuation of the transmitter signal, and transmitter parasitics, to prevent overloading or desense of the receiver. Tuning each cavity separately is only needed when making major jumps in frequency. Black finish. The Duplexer can also be custom tuned for other applications. Parameter Specification Remark DL 2110 ~ 2170MHz Insertion Loss 0. Celwave duplexer tuning instructions. A procedure for estimating the size. In the case of duplexer assemblies, the cabling harness must be intact and in good condition, and. Free programming and tuning of the duplexer is available. Baby & children Computers & electronics Entertainment & hobby. Wacom WP-640-6 VHF Duplexer Bandpass/Bandr eject 6- Cavity. Great video. Any physical vibration of the duplexer would make it act up violently, with noise bursts as high as 40 to 50 dB! I had also noticed other changes in the duplexer. Hello everyone, I recently acquired a Decibel Products duplexer, model DB-4072. Example of duplexer: It separates uplink (890-915MHz,Uplink-UL) and downlink (935-960MHz,Downlink-DL) frequency bands in GSM900 system. A duplexer are designed to be transmitted into with high power when correctly tuned and using low power while tuning are absolutly complety safe. Hook the transmitter to the duplexer ANT port, wattmeter with a 50ohm load on the other side to the respective HIGH or LOW port, terminate the other with another 50 ohm load, and give it a go. Find helpful customer reviews and review ratings for Fumei UHF 400-470MHz 30W Duplexer for Radio Repeater with Preseted Low Frequency 462MHz & High Frequency 467MHz & N Female connectors at Amazon. The Boom is 3/4" square (with rounded corners) and 37 1/2" long. Results 1 to 10 of 10. This book, however, is not finished. As an example, mobile duplexers are designed to handle low power and are very compact in size. Mobile Radio Duplexer Tuning Tuning a Chameleon F-Loop for low SWR NEW iView HD COMBO FULL HD Freeview HD + Freesat HD Satellite Receiver Set Top Digi Box + 7 DAYS FULL EPG Advanced TV Program USB RECORDER , Digital Television Tuner SCART + HDMI Input. Accessories. How to Tune a Duplexer What a duplexer does. Electrical Specifications & Proposal Specifications. I am tuning this for a gmrs repeater I put together with the frequencies 462. PCBMotor's core business model is to operate as a component supplier, delivering stator and driver circuits to low-volume solutions and Piezo components for higher volume. Adjust the low Pass side of the duplexer on the higher frequency for the deepest notch on these two cavities. This is the easiest way to explain tuning a duplexer. Hook up the duplexer and re-tune the ¼-20 screw for the deepest notch on the opposite frequency. The cavity duplexer is a very familiar part of both amateur and commercial two-way radio. To USA, UK, Australia, Canada, to other countries maybe will takes little longer. Band Reject Duplexer. Motorola T-1504A Duplexer assembly, after refurbishing and repair, hooked up during final tuning and testing. I commonly hook my signal generator to the antenna port and send one of the frequencies into the duplexer. "Our aim is usually to give superior quality items at aggressive rates, and top-notch company to clients around the earth. - Interface: BNC. 6-225MHz LPF/340-1000MHz HPF HAM Antenna Combiner VHF UHF Transit Station Duplexer 5. Customer Support 800-737-6937 630-262-6800. You have to pass through the RF through the duplexer. This is a 50 watt duplexer that allows you to connect a repeater with seperate transmit and receive ports to a single antenna. 00, On site up to 50 miles $150. NP2N used VA6AM Triplexer with BPFs during 2017 ARRL CW DX contest. It consists of four 8” OD cavities interconnected with double shielded cable in a bandpass-reject configura-tion. The duplexer is a motorola/celwave 6 cavity which was original to a Motorola GR300 repeater. Change in temperature can effect the tuning. The following equipment will be required to tune the duplexer: NOTE : 2. The duplexer provides enough attenuation of the transmitter signal, and transmitter parasitics, to prevent overloading or desense of the receiver. An iris filter is more intuitive – each waveguide iris is a perpendicular wall, so that two irises create a resonant cavity in a section of waveguide. USB interfaces: Connect your transceiver to. A "tee" junction and two more cables connects the two branches with the antenna feed line. Manufacturers recommend NOT to use RF power to tune a duplexer. transmit and receive into an antenna). I finally added the return loss readout plus support for a couple of storage references and a few other features. Duplexer 20W / 35W / 50W ( Request High and Low frequency for Factory testing. Learned a few things. Quick view Add to Cart. We have a very active local 6 meter FM group and the repeater gets a fair amount of use each day. Using an 8mm wrench, loosen the tuning lock screws that hold the four tuning rods in place. The PD 497 series duplexer is a very good duplexer until old age sets in-----I have two of them here that have gone noisy---I should say that mine produce wide band noise when transmitter power is applied----lots of desense in spite of looking perfect on the tuneup instruments-----and they are not easily fixed----and a Tx/Rx reversal didn't help. For splitting HF/VHF/UHF frequencies. Duplexer Final Tuning Instructions. UHF DUPLEXER 403-470 mhz 40 watts. 550, at somewhere around -80. 1710 ~ 1785MHz @ 80dB Min. FD183005: FD904510: FD906005: Rx Frequency, MHz : 1710-1785: 880-915: 890-915: Tx Frequency, MHz : 1805-1880: 925-960: 935-960: Rx Insertion loss, dB : 0. Some basics. Refurbished. Duplexer and circulator is sometimes used interchangeably, which is a common simplification, though not always accurate. For Entertainment Purposes. Tulisannya belum saya posting. Duplexers also provide good Tx to Rx port isolation. Duplexers isolate RF transmitters and receivers connected to a common RF line or antenna. Duplexer Tuning is additional labor charge. Fine tuning to a 50 ohm impedance match on 144. Using an 8mm wrench, loosen the tuning lock screws that hold the four tuning rods in place. I found that approximately 0. Amerizon can provide this tuning service as it requires specialized radio equipment to complete. com in a single category. Parts List. I am more of a computer person than an RF person, so tuning my own duplexer took quite a bit of help from friends and lot of research online. I have a older celwave 6 cavity duplexer that is badly out of tune. Add to cart as well as a unique fingerstock-free high-conductivity silver-plated tuning probe. Duplexer Question - posted in Technical Discussion: I have a question about duplexers. It has a frequency range of 380-485 MHz and a bandwidth of ±500kHz. The 2 Gamma Matches (shown above) are pre-assembled & pre-tuned. In essence the simplest tuned radio frequency receiver is a simple crystal set. 5 Type 3 Bodykit. All specifications subject to change without notice PASS-REJECT CAVITY AND DUPLEXER TUNING. Possible odd question but here goes. Quick view Add to Cart. The RLB1500 is a valuable tool for duplexer tuning, as the frequency which exhibits the lowest insertion loss and the frequency which exhibits the best impedance match may not coincide. 6 dB, 150 Watt. In a 3 port configuration. The main category is Duplexers and diplexers that is about Duplexer and diplexer. •Inverter coupling capacitance tuned with grounded screw between resonators. The tuning of the duplexer didn't change at all in getting banged around during transit from the lab to the mountain repeater site. A Duplexer passes transmitter power at one frequency while preventing it from reaching a receiver tuned to a different one. The coupling loops on the receive pass cavity. Specify N or UHF connectors, or 7-16 DIN (extra cost). If you want a quality duplexer and no desense, look no further. Customer Support 800-737-6937 630-262-6800. The -3dB bandwidth is approximately `10-11 MHz. Impedance change in antenna due to icing. Receiver desense protection is at least 90 dB, and TX sideband suppression is at least 75dB, making these duplexers ideal for all base stations. Their M/2 category short story…. Specifications: - 50W RF power Handling - High Quality 6 Cavity Design - Minimum Tx and Rx frequency difference: VHF 3. Do both sides of the duplexer. As you move above or below that frequency their efficiency rolls off, producing standing waves. The duplexer has three ports; they are the Antenna port, TX port and RX port. Refurbished. VSWR increase may be sufficient to reflect back through the Duplexer and upset transmitter tuning, causing parasitics, which are not suppressed sufficiently by the Duplexer. Antenna Tuning Units; Antenna Wire; Baluns; Components; Dummy Loads; Duplexers & Triplexers; Guy Rope; Lightning Arrestors; Cables, Leads & Plugs. Duplexers & Triplexers may be used for combining two/three transceivers to one coax feed line. Some factory setup duals work, depending on were the antennas are placed on the mirrors. 5 Mhz - Maximum Tx and Rx frequency. A duplexer is divided into a transmit and receive section. It is essential to have some sweep analyzer of network analyzer. R8000 Duplexer Tuning Application Note Page 3 of 6 An overview of testing a Duplexer using the R8000 is as follows: RF power from the Generator side of the R8000 is applied to one port of the Duplexer filter element or RF path under test. 00, 100 to 150 miles $350. It allows dual frequency operation on HF or 50MHz and either 2m or 70cm (duplexer not supplied). VSWR and do a full tune up of the duplexer. Search for an RCX01-A39 Duplexer. Please include transmit and receive frequencies at checkout. As the cutoff frequency of the delay component is reduced, you should expect to hear a more ‘realistic’ spatial separation between the direct signal and the delay. These are my recommended brands. Our state-of-the-art RF filters lead the industry for size, performance, cost and time to market. Duplexer Tuning/Performance The procedure used to tune the duplexer is as follows: Tune individual cavity (Bp & BpBr) Connect pair of cavities and verify performance; Connect two pairs to Tee and verify performance; An Agilent E5071B series network analyzer was used to tune and measure the duplexer. duplexer provides enough attenuation of the transmitter signal, and transmitter parasitic, to prevent overloading or defenses of the receiver. K&L Microwave offers a variety of Tunable Filter Products to satisfy a broad range of filtering applications. 66-14-26 2-inch Cavity Duplexer. The oft missed issue in retuning duplexers is return loss. TXRX 100W Mobile Style UHF Duplexer $ 990. Each cavity has about 45 db reject. VHF Compact Duplexer. Refurbished. NanoVNA for tuning notch duplexer. MFJ-4230MV Compact. 2 - 7 Improve Test Throughput for Duplexers and Other Multiport Devices 1996 Device Test Seminar: Effective Test Methods for Today's RF Devices Duplexer Test Tx Rx ANT Port 1 Port 2 Duplexer Duplexer Test Set Port 1 Port 2 Tx Rx Ant 1. Repeater is capable of both wide band and narrow band operation. I managed to get them turned around in less than 24 hours. I have 4 of these units that I will auction off over the next few weeks. 0 out of 5 stars 1 $49. UHF (400-470 MHz) - 40 Watts Continuous Duty. Black finish. Duplexers & Triplexers may be used for combining two/three transceivers to one coax feed line. They had things like Winlink, AMSAT, Introduction to Arduino, Introduction to the Raspberry Pi, SATERN, Duplexer tuning, and a few more. I've re-tuned many cavity filters, but since we really don't use duplexers at work, I've never really fussed with them. Mobile Radio Duplexer Tuning Tuning a Chameleon F-Loop for low SWR NEW iView HD COMBO FULL HD Freeview HD + Freesat HD Satellite Receiver Set Top Digi Box + 7 DAYS FULL EPG Advanced TV Program USB RECORDER , Digital Television Tuner SCART + HDMI Input. BTIHCEUOT HAM Combiner,Duplexer VHF UHF Duplexer for Radio Repeater,MX-72 1. PA7N miniVNA. Tel: 0845 2300 599. See this off-site link: Duplexer Tuning with a similar return loss bridge for details. Our cavities are constructed of hardened aluminum which, unlike most copper cavities, resists denting and associated detuning. Features compact size, low loss and temperature compensation over the range of -40ºC to +60ºC Extruded aluminum cavities and solid- shield copper-jacketed inter-cabling that ensures excellent mechanical and electrical stability All units are adjustable in the field and rated at 50 watts continuous duty with a maximum VSWR of 1. UHF Duplexer ‐ Tuned 406‐500 MHz (N‐female 4‐8 MHz spacing) All duplexers have female type "N" connectors. Before we start with the procedure This article assumes that you do not have access to a spectrum analyzer or a signal generator. Read honest and unbiased product reviews from our users. Resonant cavity body Sliding tuning rod 6. A duplexer tuning makes or brakes a repeater with respect to reception. BP-BR Duplexer Tuning: Initial on Bench vs In Service John #173336. It is a cheaper alternative to a set of phasing cables with a 10mm (5mm?) length increment. Fiplex DCL4533A Mobile Duplexer 400-520 MHz N Connector. Celwave tdn7407a, Celwave antenna catalog, Vhf duplexers for sale, Uhf duplexer 440 480 mhz, Celwave duplexer 0185417u05, Celwave, Rfs duplexer tuning, Duplexer vhf, Eia 649 b free, Dd 1694 fillable form, Mil std 973 replacement, Configuration control process, What is configuration control, Configuration baseline examples, Request for variance. •Port coupling resonators are interdigital inductive coupled (H field). 6-225MHz LPF/340-1000MHz HPF HAM Antenna Combiner VHF UHF Transit Station Duplexer 5. This completes the duplexer tune up. xxx and TX 462. ) Product Narrative. Instead, please coil and ziptie the pigtail out of the way. Tuning Instructions Number 025792 Rev: 1 Date: August 5, 2010 MR - Series. I usually pay about $350 for a good Telewave or Sinclair bandpass/band-reject (BPBR) duplexer with 80-90 dB of TX to RX isolation. 2 MHz SSB and 70cm 432. 6mm (maximum height 0. Highest quality duplexers and triplexers for splitting HF/VHF/UHF signals. The software is almost good enough. 5 db pass loss yielded about a 40 db notch at 1. Hook up the duplexer and re-tune the ¼-20 screw for the deepest notch on the opposite frequency. New Products Ultra-small SAW Duplexer Ultra-small SAW Filter Product Features The world, s smallest size with a hermetic sealing structure W-CDMA-compatible bands: I, II, IV, V, and VIII Bands I, II, IV, and VIII: 2. Fine tuning to a 50 ohm impedance match on 144. 1920 ~ 1980MHz UL 1920 ~ 1980MHz Insertion Loss 0. Notch Type Duplexer Filter Tuning SERVICE GMRS Ham Radio LMR VHF UHF 800 900 50W UHF 6 Cavity N-connector Duplexer for UHF Duplexer Kenwood 485Mhz SGQ-450D See. I've read through the Repeater Builder Dot Com site on duplexers both bandpass and notch filter designs. By using two TPRC-4504 or 4704 Pass / Reject cavities in the transmitter and receiver path, this duplexer provides maximum TX to RX protection in the most severe RF environments. How far are you moving the duplexer in frequency from where it was when delivered? Click to expand I remember the duplexer was tuned in the 440-450 portion of the band when I first hooked it up, but I don't remember exactly. The duplexer is a motorola/celwave 6 cavity which was original to a Motorola GR300 repeater. I found that approximately 0. dbSpectra manufactures Transmitter Combiners, Receiver Multicouplers, Duplexers, Filters, Antennas and Tower Top Amplifiers as well as legacy Decibel Products Land Mobile Radio (LMR) site management equipment. Since this is only rated. Here are some tips and resources I've found to help me use them. I don't have a model number handy. Without analyzer tuning of resonators is quite challange. They are basically band-pass filters, simultaneously passing RF in both directions through the common connector while the band-pass filters provide a high degree of isolation between ports. We have a very active local 6 meter FM group and the repeater gets a fair amount of use each day. NEW Daiwa LATEO 90ML/Q Medium Light 9' Casting Fishing Spinning Rod Pole,Farm Nursery Print Set of 4 Prints, Baby Animal Portraits - Horse, Lamb, Pig, - 696233590816,Inés del Alma Mía by Isabel Allende (2007, CD, Abridged) 9781933499109 - - whitecraigs. Parts List. easy fi eld tuning if frequency changes are implemented. The high frequency section of a duplexer is designed to be tuned to the higher frequency whether that happens to be either the transmit frequency or the receive frequency. TPRD-1556 - Pass-Reject Base Station Duplexer - 144-174 MHz. Diagnose and fix repeater desensitization 21 January, 2007. Baofeng Cheat Sheet. Lorch Microwave offers WD-00004, a full band EGSM duplexer, with a Tx and Rx passband insertion loss of less than 1. Quick view DX Radio Systems 3/40 Berriman Dr Wangara, WA 6065. BP-BR Duplexer Tuning: Initial on Bench vs In Service John #173336. "Our aim is usually to give superior quality items at aggressive rates, and top-notch company to clients around the earth. Wacom Wp-612 Vhf Mid Band 4-meter Duplexer Cavities Bpbr. We are specialists in the maintenance of repeater systems, including the complicated task of tuning antenna duplexer systems. Return Loss(S11, S22) 20. For Entertainment Purposes. Free Frequency Tuning - send me the high / low frequency. Learn how to clear a duplexer paper jam for the HP LaserJet Enterprise M607, M608, M609 - 13. Shop the top 25 most popular Uhf Duplexer at the best prices!. The main category is Duplexers and diplexers that is about Duplexer and diplexer. Repeater comes with RFS Celwave UHF duplexer. Specify N or UHF connectors, or 7-16 DIN (extra cost). Anyone have any luck using one of the cheap nanovna kits you find on ebay for tuning a 70cm notch duplexer? 2 comments. The duplexer must be tuned to the specific frequencies of both the transmit and receive frequencies. BTIHCEUOT HAM Combiner,Duplexer VHF UHF Duplexer for Radio Repeater,MX-72 1. Duplexer: Inbound RF signals from a transmitting station are received by the repeater antenna and directed to a component called the duplexer. Tuned Duplexers (for use with standard repeater) ‐ Must Specify Frequency for Tuning. Antennas are resonant devices. We have a very active local 6 meter FM group and the repeater gets a fair amount of use each day. 5: 1 over the entire tuning range. Software for miniVNA. Duplexer, and power supply. 3-170 MHz 350-540 MHz HF VHF UHF Duplexer With Leads. 8 Minimum Isolation < 80 dB RF Connectors < N Female Item Width < 19 in Item Length < 17 in Item Height < 4. They had things like Winlink, AMSAT, Introduction to Arduino, Introduction to the Raspberry Pi, SATERN, Duplexer tuning, and a few more. Model BP Split Boom longest part is less than 22. The cavities use N connectors and thick LMR400 type cable, and are about twenty years old. Just like when tuning using a tracking generator and tuning for the best pass response, after you tune each individual cavity in a duplexer and then cable everything together, you will need to touch up the pass adjustments for best return loss and then make the final notch adjustments last, Joe - WA7JAW. BNC connectors are standard. The transmitter side is tuned to notch out the receiver frequency. I am tuning this for a gmrs repeater I put together with the frequencies 462. edu On two meters the split is 600 kHZ. UHF Duplexer - 406-500 MHz (N-female 4-8 MHz spacing) Featured Products VX-261-DO-5 VHF 136-174 MHZ Package - Standard. EMR Corp ensures only the highest quality radio frequency products leave our facility, and has been designing, supporting and manufacturing high frequency radio equipment for over 34 years. Motorola xpr8400 uhf repeater 48watt 450-512mhz. BNC connectors are standard. Add to Cart. • Couplers take a sample of the signal in order to monitor it. By using two TPRC-4504 or 4704 Pass / Reject cavities in the transmitter and receiver path, this duplexer provides maximum TX to RX protection in the most severe RF environments. Joined Jun 20, 2005 Messages 981 Location Travelers Rest, SC. Celwave UHF Duplexer 300 400 MHz 6 Cavity BNC Tuned to 373 8 383 8 10 MHz Split. Duplexer 20W / 35W / 50W ( Request High and Low frequency for Factory testing. This voltage is called bias. Duplexer Tuning. You can also go to our Video Library page to see video tuning instructions. This completes the duplexer tune up. Change in temperature can effect the tuning. NanoVNA for tuning notch duplexer. Note that each branch has three cavities connected together with cables. Fiplex DCL4533A Mobile Duplexer 400-520 MHz BNC Connector. Also, it must not be capacitively coupled inside the duplexer or it will block the DC motor control voltage. You have to pass through the RF through the duplexer. Band Reject Duplexer. Plus the Chinese are selling knock offs on e-bay, without any discussion other than the seller offering to tune to your frequencies. Mobile Duplexers. Tune up and test the radio now, on it's old frequency. UHF duplexer for use with VXR-7000 and VXR-9000 Repeaters. Duplexer, and power supply. As the cutoff frequency of the delay component is reduced, you should expect to hear a more ‘realistic’ spatial separation between the direct signal and the delay. Designed, tested, validated and manufactured filter (duplexer) products for wireless base station Radio. Juan - November 7, 2017 Wath is the difference on the duplexer you show on the. Using a pen, clearly mark the location of the high pass and the low pass side on the top and bottom plates and side of the duplexer. When Band-Pass/Band-Reject (Bp/Br) duplexers really aren't band-pass In the repeater world there is a misconception that just because the duplexer may say "Band Pass, Band Reject" on its label - or even in its 'spec sheet - that it really does offer a proper band-pass response over a wide range of frequencies - but this is usually NOT the case. Software for miniVNA. transmit and receive into an antenna). Materials you will need: small 50 ohm dummy load Short test cables adapters as needed 3920B service monitor Start by connecting the TX side. You can "check" the tuning on a duplexer with a decent antenna analyzer (you really need one that can graph a SWR plot…which throws out most if not all of the MFJ analyzers). One method for calibrating the tunable duplexer includes building up and optimizing the tunable filters individually (a Tx tunable filter, and an Rx tunable filter), by applying an initial tuning value to each filter based on design of the communication system, and then inserting them in a duplexer environment that consists of the phase. They will be on their way back to California. If you're doing any more than retuning, in the specified band section, it can be challenging Lots of fun! 73 DE K7RSG. The physical size of a duplexer is most. 638 KB FT-450. 550, at somewhere around -80. What you'll see if the analyzer is hooked up to the antenna port and loads on the TX/RX port, is a low SWR for the passed frequencies and a high SWR (with an. The duplexer has three ports; they are the Antenna port, TX port and RX port. An on-chip tuning technique using magnetic coupling is introduced to improve the isolation of the duplexer in case of impedance imbalances. Customer Support 800-737-6937 630-262-6800. UHF/VHF MMDVM Hot-Spot OLED Module+Antenna Support P25 DMR YSF For Raspberry Pi. I have 4 of these units that I will auction off over the next few weeks. Frequency Range: 144-174 MHz. This is a new multi-mode, multi-platform software for radio amateurs. A Duplexer, preselector or similar tuned circuit is a critical part in any RF communications network. We have been ISO9001, CE, and GS certified and strictly adhere to their good quality specifications for Pressure Window, Rfs Pressure Window, Waveguide Pressure Window, Our company has built stable business relationships with many well-known domestic companies as well as. Do both sides of the duplexer. Free Tuning Included with Purchase. Electrical Specifications & Proposal Specifications. I've done everything I know to try to tune a Phelps-Dodge 6 cavity UHF Notch/Notch mini duplexer. Try using a low-pass filter on the output of a delay. Using an 8mm wrench, loosen the tuning lock screws that hold the four tuning rods in place. sabar tunggu yaa lg banyak kerjaan, atau coba browse ke yg lain mungkin ada tlisan tsb. - Duplexer Tuning Guide This is a great reference guide for a volunteer fireperson, sheriff posse officer, ham operator, EMS or Rescue personnel… Note: Although we tested the unit, we do not guarantee the test under any circumstances. Icom DCL4533A2N Mobile Duplexer 440-470 MHz (N Connector) $379. PASS-REJECT CAVITY AND DUPLEXER TUNING TEST EQUIPMENT MINIMUM REQUIREMENTS: 1. UHF DUPLEXER 403-470 mhz 40 watts. Variable-length phasing cables for tuning repeater duplexers: Part 1, Construction of the cable Introduction A variable-length phasing cable for use in determining duplexer cable lengths, using M/F SMA connectors to vary the length is proposed. Software for miniVNA. At 2000 Hz, we say the sound gives “presence” to speech, speech sounds more real and authentic. When you get into "duplexer" territory, while you fretted a bit about antenna mismatch de-tuning a duplexer, but other issues arise like de-sense (transmitter noise covering the received signal basically) due to incompatible (dissimilar) materials in contact with each other near the tx-rx antenna can present severe problems. Duplexers are designed for various application based on operational frequency and utility. These repeaters are identical to the CDR700 and GR300 the only difference is the housing, the GR500 housing has a larger power supply and fan for continuous duty operation. Baby & children Computers & electronics Entertainment & hobby. The notch cavity produces the opposite response of a. Learned a few things. xxx and not the /exact/ frequency? I would like to hop between frequencies as I travel without having to pull out a duplexer for each pair. Fiplex Public Safety Centric DAS is the evolution of the traditional Broadband RF over Fiber DAS, improving. Sort By: 5 Item(s) Show: Mobile Duplexer Tuning/Programming Service. Understanding, Maintaining & Re-Tuning Antenna Duplexers A band pass duplexer using six band pass type cavity resonators is shown in schematic form in Figure 1. The pass section of a duplexer will be properly tuned when there is maximum return loss (minimum SWR) from the transmitter to the antenna and from the antenna to the receiver. A duplexer can help by reducing the cost of leasing additional. This is a 100 watt repeater with a band split of 435-470 Mhz. VSWR should be no more than 1. - Duplexer Tuning Guide This is a great reference guide for a volunteer fireperson, sheriff posse officer, ham operator, EMS or Rescue personnel… Note: Although we tested the unit, we do not guarantee the test under any circumstances. com Motorola MTR2000 UHF Repeater and duplexer in Cabinet. When built, my house was installed with a single coaxial drop cable from the loft to the lounge, carefully hidden in the cavity wall. Traditional VHF repeaters use huge resonant cavity filters to get something like 70 dB of isolation, but for us this just isn't practical, both due to size and the manual tuning requirement. 550, at somewhere around -80. Tel: 0845 2300 599. Quick view DX Radio Systems 3/40 Berriman Dr Wangara, WA 6065. This is the easiest way to explain tuning a duplexer. I hold my opinion that it is a very good duplexer for just $91. Building your own repeater is no easy feat, but is very very rewarding. No further adjustments should be required. Add to Cart. It is essential to have some sweep analyzer of network analyzer. Note the caps between the connectors. Add to Cart. High-frequency sounds can start at above 2000 Hz, although there’s a very wide range of audible sound in this region. Comet CF-4160N - 1. Motorola T-1504A Duplexer assembly, after refurbishing and repair, hooked up during final tuning and testing. Notch Type Duplexer Filter Tuning SERVICE GMRS Ham Radio LMR VHF UHF 800 900 Wacom WP-612 VHF mid band 4-meter duplexer cavities BpBr Radio Frequency Systems VHF DUPLEXER 150-160 MHZ 6 cavity Radio Mobile WACOM VHF DUPLEXER Sinclair VHF RES-LOK Duplexer Q2220E 350 watts 132-174 Mhz Pass/Reject 4 Cavity TX RX Systems VHF Duplexer 28-37-02. Connect the Antenna port of the duplexer to the ant port of the 3920B. Rejection @ 80dB Min. However, after four months of light-duty. 5hshdwhu 'xsoh[hu 7xqlqj (txlsphqw 7r7xq h 'xsoh[huv˛ 5hfhlyhu wudqvplwwhu vlqdg vshdnhu vljqdo jhqhudwru fdqv ,qvwuxfwlrqv )ru 7xqlqj 'xsoh[huv˛ 6wduwe\ wxqlqj hdfk fdq vhsdudwho\ )ru lqlwldo wxqlqj dkdqgkh og fdqehx vhg vzlwfklqj ehwzhhq wkh uhfhlyhdqg wudqvplwiuhtxhqflhv. dbSpectra's staff of systems engineers stands ready to provide RF designs. Channel Configuration The airFiber AF-11FX can use single (SISO) or bonded (MIMO) channels, depending on your specific licensing requirements. Generally it is to join a base transmitters Tx and receive Rx together without any damage being caused by overloading the receiver and allowing one Aerial or antenna to be used. •The MR series of compact mobile duplexers can be retuned within the sub-band for which the unit was designed; tuning procedures are available upon request. Some basics. Features compact size, low loss and temperature compensation over the range of -40ºC to +60ºC Extruded aluminum cavities and solid- shield copper-jacketed inter-cabling that ensures excellent mechanical and electrical stability All units are adjustable in the field and rated at 50 Watts maximum with a maximum VSWR of 1. How to Tune an Antenna. A duplexer typically consists of two band pass filters connected in parallel. miniVNA PRO The miniVNA PRO, the big brother of the well-known miniVNA, is an extraordinary and unique handheld Vector Network Analyzer that makes available a multitude of features and capabilities which are perfect for checking antennas and RF circuits for hams and commercial users. I especially like the way you double check the insertion loss at the end. The same design steps for finalizing the duplexer design can be followed that were used for the diplexer design: optimize for the best Modelithics parts, optimize the interconnects, and then perform EM extraction optimizations with the AXIEM software if necessary. frequencies of the duplexer it may be returned to the factory for re-. Notch Type Duplexer Filter Tuning Service Gmrs Ham Radio Lmr Vhf Uhf 800 900. BNC connectors are standard. No extra charge for custom tuning. Repeater building is no longer my primary interest in ham radio. As the cutoff frequency of the delay component is reduced, you should expect to hear a more ‘realistic’ spatial separation between the direct signal and the delay. The Amtronix SW2012N Return Loss Bridge can be a valuable aid in duplexer tuning. Connect the GEN port of the Service monitor to the TX side of the Duplexer. TST is now recognized as the leading SAW device supplier in Taiwan, as well as the key OEM/ODM supplier of SAW device in the world. An on-chip tuning technique using magnetic coupling is. Arrow Antenna Duplexer. Note that each branch has three cavities connected together with cables. I would like some more understanding about the differences between say a 3 cavity, 4 cavity and 6 cavity duplexer? What would be the reasons to get more captivity vs not? The tower I am on only has a public safety repeater in VHF and 2. The duplexer is factory-tuned to the exact frequencies appearing on the decal with use of a spectrum analyzer/tracking generator and no further tuning or "touching up" is required. Great video. To detect the amount of “desense”, that is, how many dB receiver sensitivity is degraded when connected to the antenna from its own or other transmitters, and trace the desense source, a signal generator with an “isotee” is used to generate a precise signal level with a dummy load and antenna. Add to Cart. It includes two BCR repeaters and two BCD-440250 duplexers funneled into the BCD-UHF Combiner Duplexer. Have sku set up. Newbie duplexer tuning advice. This duplexer resonators are made from 1"5/8 helical coaxial cable. 2 dB loss N/female connectors *TESSCO tune or field tune. The same design steps for finalizing the duplexer design can be followed that were used for the diplexer design: optimize for the best Modelithics parts, optimize the interconnects, and then perform EM extraction optimizations with the AXIEM software if necessary. Connector needed to be refitted correctly. Customer Support 800-737-6937 630-262-6800. (Q2220E) Duplexer, Q-Circuit, Res-Lok, 4 cavity, rack mount, 138-174 MHz • Four cavity duplexer with 70 dB of isolation • Only 1. see Applications Manual Move the cursor knob to the "Analog" field and scroll to and select "Decoder". Buy It Now +$18. I finally added the return loss readout plus support for a couple of storage references and a few other features. Tuning Method < Tune Frequency Range < 144-165 MHz Minimum Separation < 3 Number of Cavities < 4 Maximum Power Input < 120 W Maximum VSWR < 1. Tuned Duplexers (for use with standard repeater) ‐ Must Specify Frequency for Tuning. Icom DCL4533A2N Mobile Duplexer 440-470 MHz (N Connector) $379. (Q2220E) Duplexer, Q-Circuit, Res-Lok, 4 cavity, rack mount, 138-174 MHz • Four cavity duplexer with 70 dB of isolation • Only 1. Sinclair - 450-470 MHz Pass Reject Duplexer (Q3330E-3) SINCLAIR 450-470 MHz Duplexer. The 633-A Mobile Duplexer uses four resonators and cabling similar to 633-6A. • Filters and diplexers allow us to have clean and non-interfered signals and to separate signals between antenna and radio. A duplexer has the shape of large tall cans and is designed to pass a very narrow range of frequencies and to reject others. Fit for Motorola Repeater Enclosurer. The filters that make up the duplexer isolate the transmitter from the receiver by filtering out. This is the easiest way to explain tuning a duplexer. 5 db pass loss yielded about a 40 db notch at 1. UHF Duplexer ‐ Tuned 406‐500 MHz (N‐female 4‐8 MHz spacing) All duplexers have female type "N" connectors. 1710 ~ 1785MHz @ 80dB Min. The duplexer in question, currently in storage, is from an inactive repeater that is getting a new frequency pair assigned. How to Tune an Antenna. Do both sides of the duplexer. The RX is usually a better choice when tuning notches, since you can usually get enough dynamic range, since a typical receiver will work at -120dBm, but many spectrum analyzers will not do much past -90 to -100 dBm. Sony Msw-m2100p Multiformat Player 40 Drum Hours, Sp, Sx, Digi Beta, Imx. • Power dividers/combiners split a signal among several signal paths and vice versa. The duplexer exhibits an isolation from Tx to Rx of greater than 60dB. Below is a comprehensive list of downloadable instructional manuals to help tune and understand your products. Base station duplexers are designed to handle higher base radio power and generally designed to be mountable in standard equipment racks. 6-225MHz LPF/340-1000MHz HPF HAM Antenna Combiner VHF UHF Transit Station Duplexer 5. VXD-60VC for VHF also available. Duplexer Tuning Services: We custom tune many different types of duplexers, both in our Canadian lab, as well as onsite, anywhere in the worldliterally. Notch Type Duplexer Filter Tuning SERVICE GMRS Ham Radio LMR VHF UHF 800 900. Fit for Motorola Repeater Enclosurer. Calibrated RF indicator such as a network analyzer or spectrum analyzer, with sensitivity of at least 80 dB below the RF generator output. The TPRD-4544/4744 duplexers mount on a 19” standard rack, with panel height of 5. Icom DCL4533A2N Mobile Duplexer 440-470 MHz (N Connector) $379. Duplexers are designed for various application based on operational frequency and utility. You may have to register before you can post: click the register link above to proceed. The cursor points to the step: the number keys directly input or the up and down keys to adjust the step change in 5K scan range will be slightly changed to fit the size of the grid. UHF duplexer for use with VXR-7000 and VXR-9000 Repeaters. 2000W Triplexer High Power BPFs 3000W Triplexer with BPFs set 2000W Triplexer with BPFs set VC3S claimed the new MS High Power Canadian record in 2016 CQWW RTTY using VA6AM Triplexer and BPFs. As the cutoff frequency of the delay component is reduced, you should expect to hear a more ‘realistic’ spatial separation between the direct signal and the delay. Some subjects could. The following scans were obatined from my HP8920A service monitor. The definition of the tuned radio frequency, TRF receiver is a receiver where the tuning, i. Antenna Efficiency runs between 15% up to 50% efficient. drifters Ch. Applications include digital and analog wireless radio, low power repeaters and mobile full duplex radios. Duplexer/Splitter/Combiner. Instructions. 000 and the receiver side is tuned to 444. The duplexer is factory tuned to the exact operating frequencies prior to shipment from the factory. The duplexer is a motorola/celwave 6 cavity which was original to a Motorola GR300 repeater. It have 4 resonators per RX and TX direction. Even used ones can cost a pretty penny these days. Icom Mobile Band Reject Duplexers such as the DCL4533A2N are coaxial mobile duplexers for use in systems up to 50 watts. NanoVNA for tuning notch duplexer. Duplexer, Q-Circuit, Res-Lok, 6 cavity, rack mount, 138-174 MHz • Six-cavity provides 85 dB isolation • Res-Lok design reduces inter-cavity cabling and losses • Provides up to 85 dB isolation at frequency separation of 500 KHz Model List View PDF: 8 1/2 x 11 View PDF: A4. The VXR-7000 serves as a repeater or as a convenient base station for simple fleet communications in public safety, industrial or administrative work areas and helps expand reception range. I've read through the Repeater Builder Dot Com site on duplexers both bandpass and notch filter designs. Our vector network analyzer and signal generator are calibrated semi-annually to NIST traceable standards with. The short cable helps to match the internal loop to frequencies above and below the notch frequency up to the minimum and maximum tuning range of the cavity. 800 MHz, CSC Milled WF Duplexer (MWFD8CMCSN) 806-869 MHz, 6 Cavity Multi-Ch. BNC connectors are standard. Duplexer 20W / 35W / 50W ( Request High and Low frequency for Factory testing. The TPRD-1554 has two pass-reject cavities in the transmitter and receiver sections. The primary goal in tuning an antenna is to make it usable all across the band(s) it is designed for. Construction isn't terribly hard, and neither is tuning. Comet CF-416A - 1. Duplexer Tuning With Vna. is a worldwide recognized designer and manufacturer of highly innovative telecommunication products focused on providing solutions to Public Safety and Mission Critical applications. It have 4 resonators per RX and TX direction. Comet CF-706A - HF-6M 2M 440 MHz Duplexer for Icom IC-706 MKII G FT100. An on-chip tuning technique using magnetic coupling is introduced to improve the isolation of the duplexer in case of impedance imbalances. For more information click on the spec sheet link below. Learned a few things. When it was tuned on our original 145. Motorola Xpr8300 Uhf 100 Watts 403-470 Mhz Trbo Repeater, Duplexer, Pa For Sale Online. Results 1 to 5 of 5 Tuning Filter using CST 3D Filter Tool (1) S11. Arrow Antenna Duplexer. Without analyzer tuning of resonators is quite challange. They are a pain to tune, and are designed to stay. MODEL WP-641 is a 4-cavity BpBr Circuit® duplexer designed for use with duplex systems operating in the 144-174 MHz band when the separation between the transmit and receive frequencies is 500 KHz or more. Please see the Analyzer comparison table.
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