Repeater duplexer. Most radio repeater systems include a duplexer.

Repeater duplexer. That means it will work across the entire band, just not well. Two separate antennas can be use with out a duplexer but the separation of the two antennas is to hard to obtain 90dB isolation is needed. These repeaters use two frequencies in a duplex fashion to extend the range of the radio system and make signals much stronger. 175 MHZ RX/464. And we’re here to help. Again, if this is the first time the duplexer is being tuned, you may want to tune each receiver band pass first, and then fine tune them together. If you are building the repeater from scratch, you’ll need to figure out the type of duplexer that is needed. It handles station identification (through either morse code ("MCW") or voice), activates the transmitter at the appropriate times, controls the autopatch (if so equipped), and sometimes does many other things. New and Used Land Mobile Radio Equipment Suppliers Motorola®, GE®, Etc. There are several different ways to build a duplexer. Again, it seemed to be working ok, other than the duplexer absorbing more than half of the power from the TX radio. Repeater Equipment SuppliersArcom - Kenwood Dealer Kenwood Repeaters from Kenneth Arck AH6LE with a focus on functionality and value. With an emphasis on duplexers and why a person would get one. The BCD-440 is built around a mobile type six cavity chassis boasting an impressive 80 dB isolation. This may be because of aging, or to set up on new frequencies. The repeater’s job is to take the signal it hears on its receiver and retransmit it on the transmit frequency. Price-Match Promise and free delivery on orders over £200. ) everything went to crap. Figure 3-1 shows the common configuration. Get the best deals for Vhf Repeater Duplexer at eBay. Without a duplexer, the repeater would require two antenna systems, one for the transmitter and one for the receiver. May 24, 2024 · We receive a lot of inquiries about duplexers how they are used with repeaters. com labs with complaints of “They worked great for years with our old Mastr II repeater running 40 Watts, but when we bought and installed a new Fusion repeater (or D-Star repeater, DMR machine, etc. All the coax that you use in a repeater must be 100% shielded. , can continue to be used as-is. They are the power suppl Repeater “Duplex” Operation We’ve discussed briefly that topography and tall buildings can greatly affect the usable range of a radio. A duplexer is necessary when working in DIGITAL mode. Aug 4, 2018 · Modifying Wacom VHF Duplexers for 2-meter Amateur UseBoth of these are pass/reject duplexers, where the main cavity handles the pass-band tuning while a stub hanging off the side of the cavity handles the reject-band tuning. Jul 29, 2025 · Without a duplexer, simultaneous operation on closely spaced frequencies would result in severe interference. They’re well known to repeater owners and builders. ‣ #woocommerce_price ‣ Purchase, Software, and Support for BaoFeng and BTECH Radios To tune a duplexer frequency is a critical process that ensures optimal performance of your ham radio repeater system. It operates in the 150 to 174 MHz band when the transmitter and receiver frequencies are separated by 5 MHz or more. DR-2X/XE Features Nov 10, 2020 · Buy Retevis RT97 GMRS Repeater, Full Duplex Portable Radio Repeater with LCD Screen, Portable Compact Base Station for School Farm Emergency (1 Pack): Two-Way Radios - Amazon. OEM gear with technical specs and compatibility details at Radioparts. If you need assistance, call us at 816-532-8451 and we can help specify the correct duplexer for your specific application. Amazon. com FREE DELIVERY possible on eligible purchases May 21, 2015 · Duplexers and Repeaters Some Basic Information BY ROBERT A. BUT the Q isn’t great in helical short cavity. But what is a duplexer? What are actually inside these things and how do they function? How important are they to the operation of a repeater and what happens if they fail? Sep 10, 2008 · I've seen a low-band repeater with a conventional 6-cavity duplexer with one side feeding the repeater receiver. com the BridgeCom 40du. If you have purchased duplexers that are used, they must be tested and Jul 30, 2025 · Find the ideal duplexer for your Motorola repeater system with this expert guide covering frequency range, power handling, isolation, and installation tips. Are you looking for Base Repeater Duplexers? Shop Base Repeater Duplexers for sale today at the Antenna Farm! Apr 26, 2018 · Have you ever wondered what makes a repeater system? Or interested in setting up your own system? This article will explain all the components of a repeater system. 25m duplexers, click HERE. I decided to try adding a duplexer into the mix and just go with one antenna. A collection of information on the Motorola T1500 UHF duplexer. We'll have more to say about the overall structure of a complete duplexer later. Tuning a duplexer (RLB / Coupler vs. Precision Duplexers for Better Radio Performance BridgeCom Systems’ duplexers improve radio communication by reducing interference, boosting efficiency, and delivering reliable performance for commercial users, public safety, and amateur radio users alike. These were commonly used in mobile repeater applications and were made by Celwave, Phelps Dodge, and others. Determining how much this Shop for Procom and Hytera UHF and VHF repeater duplexers. 2GHz repeater duplexer using a NanoVNA V2plus4. Xinlun Technology Communications is a professional manufacturer in UHF/VHF cavity duplexer, RF antenna duplexer, supporting with ODM/OEM duplexer worldwide. Once The BCD-150 is the best mobile style duplexer on the market, You'll rest easy knowing you have a quality built duplexer handling your repeater needs. Here's how to do it. VHF Duplexers. 4 percent, or 600 kHz. While duplexers use narrow passbands and notches to work their magic, a diplexer is a simple high and low pass filter con- nected together. In most cases, a duplexer is used as part of the repeater station. S Sep 10, 2016 · In a perfect world, you'd have a $2,000 repeater with a built-in duplexer, super high grade hard line, and a 7 db gain antenna on the top of that 60' mast. There is some confusion over the naming and functionality of Duplexers, Diplexers and Combiners (even Wikipedia gets it wrong occasionally). A large number of these systems use frequency separation of two percent or more between input and output channels. Both in working condition. All cavities are factory tuned to the exact frequency indicated on the label. 15. Jul 3, 2022 · The homebrew duplexer presented below was created for a DMR UHF repeater with 9MHz offset, however, especially the offset does not matter, every cavity will have to be tuned to a desired frequency. However, I'm wondering if the mast you have would handle the weight of the hard line and gain antenna. Only three things matter: The first is shielding. 30-50 MHz duplexers have a tuning range of approximately +/- 2. Duplexers can be based on frequency (often a waveguide filter), polarization (such as an orthomode transducer), or timing (as is typical in radar). Also works with the Wouxun KG-1000G GMRS Two Way Radio. It is basically a necessity. The R1225 module was also the core of the narrowband upgrade kits for the GR400 (rack mount) and GR500 (wall mount) packaged repeaters. Apr 17, 2010 · When is a duplexer needed when setting up a repeater? I was planning on building a battery powerd mobile repeater from HTs and a battery powerd controller and wanted to know when does one need a duplexer? I understand that it allows you to use the same antenna to receive and transmit at the same time. You would have to cut your power 4 times to see a single s-unit of loss. Or are they? Don’t XLT DP-GMRS-50 Mobile Band Reject Duplexer is designed for use in GMRS systems up to 50 watts. Dec 11, 2020 · What is a Duplexer? A duplexer is a device that allows bi-directional communication over a single channel. That part worked out fine, and the repeater was working. No further tuning or optimization is necessary. Since we install duplexers in our repeaters and sell duplexers as part of our system packages, I often get asked about them. This essential device makes modern repeater systems like the popular RT97L portable repeater possible, especially when combined with features like 25W power output and IP66 waterproof protection. The BCD-150 is built around a mobile type six cavity chassis boasting an impressive 80 dB isolation. A duplexer is an in-band device, a diplexer (or triplexer or quadplexer) is a multiband device, and both are covered in different sections on the Antenna Systems page. Actually the cavities on both sides of a duplexer only ever "reduce" the unwanted signals, just sufficiently for the repeater to function. Or are they? Don’t Mar 21, 2018 · Buy Fumei UHF 400-470MHz 50W Duplexer for Radio Repeater with Preset Low Frequency 462MHz & High Frequency 467MHz & N Female connectors: Two-Way Radios - Amazon. Duplexer design, website issues, or to have a duplexer built for use on your repeater or e-mail Jim (call sign: WB5WPA) at "jvpoll at dallas -dot- net" (Be sure to remove the at and -dot- and spaces and replace as required). This type of equipment is not often found in a two-way shop so technicians resort to using signal generators, spectrum analyzers, wattmeters, general coverage receivers and Jan 7, 2020 · Very often we deal with duplexers sent to the DuplexerRepair. More commonly are band/reject type duplexers used, for the advantage of additional filtering outside the repeater's frequencies and normally a slight increase in insertion losses, however, gaining in system performance. Duplexer Cable Lengths click for larger image (16KB) The diagram to the left shows the original cable lengths used on the N6EX repeater duplexer. While duplexers are factory tuned, in most cases, field retuning sometimes necessary. 5 MHz above the lower frequency or 465. A duplexer needs both sets of cavities tuned to the frequencies you will use, one side to the 467 channel, the other to the 462 channel to work at its best efficiency and lowest insertion loss. 175MHZ Radio Repeater N Connector for Radio Repeater for Residential Areas,Shopping Malls,Hotels,and More Shown here is a basic band-reject for this study. If the pass or reject frequency must be changed, Telewave recom-mends that the cavity or duplexer be returned to the factory to ensure optimum performance. com The duplexer is by far the most expensive part of a low power repeater and consumed almost 50% of my repeater budget. Most radio repeater systems include a duplexer. Jan 9, 2019 · Cavity Duplexers Chapter 9 by W6NBCLike almost everything else in a duplexers, my experiments demonstrated to me that the type of coax that you use to couple the cavities together is not critical. BR duplexers are more suitable for close spacing 'splits' (repeater splits) when working with a small number of Q-limited (non-optimum Q value) resonant elements such as 1 1/4" or 1 5/8" Heliax Stubs. Minimizing the attenuation of the received signal by improved receiver performance, minimizing feedline loss, optimal duplexer tuning, etc. Motorola DSCP10725UNTUNED Untuned UHF Duplexer, 406-500 MHz, N-female connectors, 5-7 MHz spacing, pre-tuned to 460 MHz (Low) and 465 MHz (High). Duplexer für Relais im Amateurfunk. There was a separate noise antenna with a separate single cavity in-line with the noise antenna and the noise blanker antenna input. The duplexer allows both the transmit and receive radios to simultaneously use one antenna. Great for Amateur and Commercial Applications. Oct 14, 2004 · Antenna Systems - Duplexers sub-pageA diplexer (or triplexer or quadplexer), is a bandpass filtering unit, usually L‑C based, that allows multiple transmitters, or receivers on different frequency bands to use a single feedline, antenna, or both. INSTALLING AMATEUR RADIO DUPLEXERS According to ARRL, 12,600 amateur radio repeaters are in-service in the United States and that includes a lot of duplexers. Chapter 1 – The Mysterious Duplexer The cavity duplexer is a very familiar part of both amateur and commercial two-way radio. Jan 9, 2019 · Cavity Duplexers Chapter 5 by W6NBCIdeally, in the "perfect" duplexer, the transmitter of the duplexer should be "invisible" to the receiver on the opposite port, and vice versa. The SWR the transmitter see's will climb too fast for it to work. RRX series plus other repeaters. A duplexer is a tunable filter that allows a repeater’s transmit and receive frequencies to share one common antenna. Modifications: This video shows how to tune a 1. Diplexers are completely different and much simpler to build devices then a repeater duplexer. ” We deal with such all the time. Nov 24, 2004 · The duplexer is a critical part of many repeater systems. This web page describes the construction, overhaul and tuning of the T1500, T1501, T1502, T1503, T1504, T1505, T1506 and T1507 units, and includes an original manual and a writeup on combining. We also offer antennas for HF shortwave, VHF and UHF. See full list on radiothoughts. Nov 21, 2006 · The R1225 is the core full-duplex radio module of the cube-shaped GR1225 desktop / tabletop repeater and the RKR1225 rack mount repeater. The instructions in this document are for use only if factory service is not practical. 175 MHZ RX: 464. A duplexer is a device that allows a single antenna to be used simultaneously for transmitting and receiving two different frequencies. Learn more about repea PRODUCT DESCRIPTION DB4055 - The DB4055 duplexer is designed for use with a single, broad band antenna in a mobile repeater or duplex-type system. Duplexer: Inbound RF signals from a transmitting station are received by the repeater antenna and directed to a component called the duplexer. Repeater manufacturers will suggest the type of duplexer needed for their repeater and usually offer to sell you one. Feb 14, 2023 · So the duplexer was a separate device from the repeater I confused myself as I thought the duplexer was built into the repeater on mygmrs. Duplexers must: Be designed for operation in the frequency band used by […] Nov 6, 2017 · I've tuned a lot of duplexers over the years. We manufacture duplexers for 2m, 70cm, 23cm, VHF UHF repeater for Amateur Radio and Professional use. May 13, 2024 · A Notch duplexer (small mobile types) can be tuned for the middle of the repeater frequency range and be used for that full range with some degradation on the band edges. How does a duplexer work? At its core, a duplexer uses a series of bandpass and band-stop filters to create what might be described as a traffic control system for RF signals. The repeater controller, receiver and transmitter are all packaged into a 19” standard cabinet rack mount panel unit for simple replacement of an existing repeater. Works with GMRS repeaters. However, antenna placement is going to impact performance more than transmitted and receive losses in the duplexer. The dang 100 khz spacing is HARD to get DUPLEXERS to WORK!!! HIGH Q is better for that reason. May 26, 2023 · FM Repeater System Installations: Duplexer vs. Dec 26, 2019 · Wendry 10W UHF 6 Cavity Duplexer UHF Duplexer TX: 454. com FREE DELIVERY possible on eligible purchases Apr 16, 2025 · When building a reliable GMRS repeater system for outdoor adventures, emergency communications, or off-grid living, one component plays a critical yet often overlooked role: the radio duplexer. 2 GHz. Base station type duplexers offer the best performance but come at the cost of taking up more space and being heavier. Amateur 2-meter repeaters have a separation of only 0. LEHNING*, WA2YSJ All across the country there are many amateur repeate stations operating on 2 meters, 220 and 440 MHz, and to some extent on 1. Oct 1, 2023 · I also have a fixed repeater with a duplexer sharing 1 antenna. Parts of a repeater system A repeater systems contains 5 core parts. YES the duplexers are LARGE, there’s a way to get them smaller…. Tuning instructions are included in the shipment and must be followed in order to keep the warranty in place. When searching the markets for a pre-owned unit, it is often difficult to determine the suitability of available units to a particular application. A pass / notch duplexer, especially a good one isn't going to allow for that. Connect the duplexer to the Jun 27, 2024 · When setting up a radio repeater system, some people hesitate between going with a repeater duplexer or not using a duplexer. Smaller ones… (helical, below guts…) Short Cavity measures… HOME MADE CAVITIES !!! So, the repeater runs about 100+ watts Nov 27, 2023 · We have a 2M Quantro, 2M Quantar, 440 Quantar and a spare, GMRS repeater and a 220 repeater and associated duplexers. Sep 11, 2005 · REPEATERS Most radio systems today use repeaters located on top of buildings, towers or on hill tops. Repeaters for 2M, 220, and 440 MHz. FM repeater operation uses two frequencies: the repeater receive frequency and the repeater transmit frequency. How do they work? What are they used for? And how are duplexers tuned? To answer these questions, W2AEW, just put out a great video where he answers Find professional Repeaters/Duplexers in our Two-Way Radio Equipment category. A duplexer provides the means for simultaneous operation of a mobile relay or repeater station having separate TX and RX frequencies when using a common antenna. Jan 9, 2019 · A duplexer is normally made up of four to six 1/4 wavelength coaxial cavities. Motorola MSF5000 synthesized VHF repeater, with Sinclair Q2220 duplexer. In this article, we will explore the pros and cons of both approaches to help you make a decision. Duplexers have been in use by many commercially operated repeaters for many years. One interesting question - does the NanoVNA V2plus4 have Mar 29, 2023 · Can I set up a repeater using two radios and a control box, or do I need a duplexer? New HAM radio repeator in town, how to prepare the equipment including the duplexer for set up All duplexers are factory turned. Some repeater owners attempt to tune their duplexers using the simple method of hooking a couple of radios to their duplexer, using one to transmit and one to receive, and simply tuning for the highest s-meter reading on the receiver for the pass frequency and the lowest s-meter reading for the notch frequency. Repeater has built in ident and controller and is. Duplexers acquired from a manufacturer are tuned to the repeater frequencies and contain the required number of cavities required for that particular repeater. Proper tuning ensures that the transmit and receive frequencies are isolated effectively, while preventing interference and maximizing signal clarity. In practice, however, this is never totally true. Most of the cables will be Type N male on each end but a few will need PL-259 connectors. Sep 4, 2025 · This index page covers the antenna system, which is made up of everything from the repeater transmitter or repeater receiver antenna jack out, including duplexers, circulators, isolators, feedlines, the antenna (s) themselves, etc. Repeater Duplexer 50W N-connector UHF 6 Cavity Duplexer SGQ-450D Specifications: 50W RF Power Handling 6 Cavity Design Minimum Tx and Rx frequency difference: UHF 3MHz Maximum Tx and Rx frequency difference: UHF 12MHz Fequency Range: UHF 400-470MHz(the full band) Bandwidth:±500kHz Standard Termination: N Connector Frequency Spacing: 8-10MHz Insertion Loss:≤1. Ritron Inc. Mar 14, 2024 · When using a GMRS duplexer with a KG-1000G repeater setup, it needs to be connected to your repeater correctly. The spec sheets as well as tuning instructions can be found in the Wacom duplexer section on the Antenna Systems page on this web site. A TX/RX Systems Vari-Notch duplexer is used in this video. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Chapter 1 – The Mysterious Duplexer The cavity duplexer is a very familiar part of both amateur and commercial two-way radio. Drop in replacement for your local club repeater. com: duplexer400-470MHz UHF Duplexer, 50W Radio Repeater Duplexer for Radio Repeater Systems, Pre-Set Low Frequency 462MHz and High Frequency 472MHz, N Female Connectors In this video, David from our tech department at Buy Two Way Radios explains what a duplexer is, how it actually works, and some common failure points. Repeaters operate in full duplex mode, because they receive and transmit at the same time. Shop Comet duplexers and triplexers, MFJ duplexers, and more! DX Engineering has duplexers and triplexers in stock and ready to ship! Mar 2, 2018 · TWO-WAY RADIO REPEATERS: HOW TO CHOOSE AND INSTALL A two-way radio repeater takes weak and low-performing signals and retransmits them at a higher power so they can cover longer distances, ranges, and terrains without degradation. The generic term is diplexer (di=2, two bands / three connectors), but you may hear folks use the term diplexer (or duplexer) to refer to a Duplexers allows simultaneous transmission and reception on a single antenna, essential for repeater systems. Otherwise all of the effort to isolate your receiver from Are you looking for Duplexers, Diplexers & Triplexers for Two Way Radio? Shop Duplexers Diplexers & Triplexers for sale today at the Antenna Farm! Sep 7, 2022 · I was attempting to put together a portable repeater system, using two radios and two antennas. Getting the most from your repeater systemFirst, keep in mind that a repeater's performance is usually limited by its ability to hear the users, not by its power output. UHF Duplexers. First, though, we need to take a look at the important mechanical and electrical properties of the individual cavities. In radio communications systems, it isolates the receiver from the transmitter while permitting them to share a common antenna. Controller - This is the brain of the repeater. Applications include repeaters up to 100 watts and mobile full duplex radios. If you need 220 MHz / 1. High RF-current components silver-plated Vari-Notch® design low loss and high isolation compact 144-174 MHz Pair with a BridgeCom BCR-50V Repeater Mar 18, 2005 · A description of the matching technique provided by Coaxial Cabling Lengths between the Duplexer and the Repeater versus a "Z-Matcher" By Eric Lemmon WB6FLY HTML'd and edited by Mike Morris WA6ILQ The Duplexer The purpose of the duplexer is to combine the transmitter and receiver into a single antenna and isolate each other with minimal losses. On a typical two-way hilltop, cavity duplexers are as common as the forest of antennas that bristle from the towers. Tune the receiver band pass. Loss)1 - 6 of 6 1 Aug 8, 2022 · Tuning to a range implies the duplexer is tuned to the center frequency 2. BridgeCom Systems, Inc. The diagram and included chart show the lengths between the two cavities (Bp and BpBr) on each side of the duplexer as well as lengths between the BpBr on each side and the Antenna Tee connector. Existing peripheral devices such as the duplexer and amplifier, etc. Please see the DR-2X/XE Brochure for more information. Aug 16, 2000 · Notch only duplexers are readily available in the used / surplus market and eBay is also a good source. Today I show what a duplexer does on a repeater, how they are tuned and how you can eliminate interference with other types of filters. 175MHZ Radio-Tone Repeater $7930 Save 20% at checkout FREE delivery Sun, Dec 29 A duplexer can help by reducing the cost of leasing additional antenna space and by eliminating the cost of an additional antenna. Applications include repeaters up to 50 watts and mobile full duplex radios. com FREE DELIVERY possible on eligible purchases A "Repeater Station" is a station designed to be used as a duplex repeater. com. Duplexer manufacturers often use RF network analyzers to set up duplexers. is one of the least expensive ways to maximize the useful range of the system. com FREE DELIVERY possible on eligible purchases Browse our complete line of duplexers for two way radio repeaters. The BCD-440 is the best mobile style duplexer on the market, You'll rest easy knowing you have a quality built duplexer handling your repeater needs. A split Mar 21, 2018 · Buy Fumei UHF 400-470MHz 30W Duplexer for Radio Repeater with Preset Low Frequency 462MHz & High Frequency 467MHz & N Female connectors: Two-Way Radios - Amazon. One antenna was the least costly solution as lightning protection and one coax run is much cheaper. XLT DP-GMRS-100 Mobile High Power Duplexer is designed for use in GMRS systems up to 100 watts. The duplexer cooks off about half the power, both transmitted and receive. Specify pass and reject frequencies. Oct 15, 2018 · Buy Fumei VHF 136-174MHz 50W Duplexer for Radio Repeater with Preset Low Frequency 156MHz & High Frequency 163MHz & N Female Connectors: Two-Way Radios - Amazon. XLT Co 380-520mhz UHF Duplexer for Radio Repeater Duplexer TX/454. Cable the duplexer for operation, that is, cable all of the cavities, two (or three) on the receiver and two (or three) on the transmitter. I would like to purchase a roll of small flexible cable and replace all the jumpers over a period of time. 5 MHz from center frequency as built. When it comes to setting up FM repeater systems, one important consideration is the choice between using a duplexer or two separate antennas BTECH GMRS-RPT50 50W GMRS Repeater, Plug-and-Play: Features smart duplexer (All 8 Repeater Pairs), intuitive user interface, versatile power options, and built-in auto ID using MCW Morse code. 0dB Nominal Impedance: 50Ω V. plus many other items like portables, mobiles, duplexers and power amplifiers. Two AntennasIntroduction:FM repeaters play a crucial role in extending the communication range and effectiveness of radio operators. Most repeaters have one. Plug-and-Play Convenience: Comes equipped with an advanced smart duplexer, pre-configured for all 8 GMRS repeater pairs, enabling instant setup and use. This is OLD picture now but give size of duplexes 1/4w. ppt vjfmv ib8n8 udre ragatta lksq2 ixevz pkl 8rci63 ek2f1