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    AI Overview
    SWR Spikes from MFJ-916B Duplexer? (Before/After) : r ...
    Low VSWR (Voltage Standing Wave Ratio) duplexers are critical RF components that allow simultaneous transmit (TX) and receive (RX) on a single antenna with minimal signal reflection, typically featuring a ratio below 1.5:1 or 1.2:1. These devices ensure high efficiency by reducing power loss and protecting sensitive radio components. 
    This video explains how to measure the VSWR of a duplexer:
    Related video thumbnail
    1m
    Getting Started with the ZNB3000 – Duplexer Measurements
    Rohde & Schwarz
    YouTube• Aug 28, 2025
    Top Low VSWR Duplexer Options 
    • Comet Antenna CF-530C: Known for low VSWR (< 1:1.2) and low insertion loss (< 0.2dB on low pass), suitable for combining or splitting UHF/VHF signals.
    • Comet CF-706A: A high-performance, 50-ohm duplexer designed for 1.3-56 MHz and 75-550 MHz, providing high isolation (> 50 dB).
    • Ubiquiti airFiber 11 Low-Band Duplexer: Designed for high-frequency (10.7 - 11.7 GHz) airFiber radio configurations.
    • TXRX 2m (VHF) 400W Duplexer: A 4-cavity, 144-174 MHz unit with a 1.3:1 VSWR and 85 dB isolation. 
    Key Considerations 
    • VSWR Ratio: A lower ratio (e.g., 1.2:1) means lower reflection (~96-98% power reaches the antenna).
    • Isolation: High isolation (> 50-80 dB) ensures the transmitter does not blind the receiver.
    • Insertion Loss: Low-loss designs (e.g., < 0.2-0.5 dB) prevent signal degradation.
    • Power Handling: Ensure the duplexer handles the maximum transmit power (e.g., 600W PEP for the CF-530C). 
    Properly tuned cavity-based duplexers, often featuring 4-6 cavities, offer the best combination of low VSWR and high isolation. 
    This video demonstrates the process of tuning a VHF duplexer:
    Related video thumbnail
    19m
    VHF Duplexer Tuning
    Jim G
    YouTube• Nov 13, 2025
    • How Land Mobile Radio Duplexers Work and What to Know About Duplexers - Telewave.io
      Oct 2, 2024 — A duplexer is an electronic device that allows forward and reverse signals to travel in a single signal path. Duplexers can be use...
      Telewave.io
    • TXRX 2m (VHF) 400W Duplexer
      The TXRX 2m (VHF) 400W Duplexer is a compact device with a Vari-Notch design that provides low loss and high isolation. It has the...
      BridgeCom Systems
    • VSWR Calculator: What is VSWR and How To Calculate It - Ezurio
      Jun 9, 2025 — In summary, a low VSWR is desirable because it indicates most of your RF energy is doing useful work (getting to or from the anten...
      Ezurio
    • Go to product viewer dialog for this item.
      Comet Antenna
      Sometimes referred to as combiners or splitters, these duplexers are basically band-pass filters, simultaneously passing RF in bot...
      Google
    • Go to product viewer dialog for this item.
      Comet CF 706 Duplexer
      The Comet CF-706 is a high-performance duplexer, designed for simultaneous transmission and reception on the 1.3-56 MHz and 75-550...
      Google
    • Go to product viewer dialog for this item.
      Ubiquiti airFiber 11 Low-Band Duplexer
      Low-Band Duplexer 10.700 to 10.955 GHz 11.200 to 11.445 GHz The AF-11FX features a unique modular duplexer design to suit multiple...
      Google
    • How Land Mobile Radio Duplexers Work and What to Know About Duplexers - Telewave.io
      Oct 2, 2024 — A duplexer is an electronic device that allows forward and reverse signals to travel in a single signal path. Duplexers can be use...
      Telewave.io
    • TXRX 2m (VHF) 400W Duplexer
      The TXRX 2m (VHF) 400W Duplexer is a compact device with a Vari-Notch design that provides low loss and high isolation. It has the...
      BridgeCom Systems
    • VSWR Calculator: What is VSWR and How To Calculate It - Ezurio
      Jun 9, 2025 — In summary, a low VSWR is desirable because it indicates most of your RF energy is doing useful work (getting to or from the anten...
      Ezurio
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    Videos
    Understanding Duplexers
    YouTube · Rohde & Schwarz
    Aug 28, 2025
    YouTube · Rohde & Schwarz
    20:52
    Duplexers are 3-port RF devices that enable a single antenna for simultaneous transmit and receive with small frequency separation.
    Rohde & Schwarz
    YouTube·
    Aug 28, 2025

    Understanding Duplexers

    YouTube·Rohde & Schwarz·Aug 28, 2025
    YouTube
    In this video
    • 00:00
      Introduction
    • 00:14
      Suggested viewing
    • 00:37
      About duplexers
    • 02:01
      Duplexer construction
    • 02:55
      Duplexer form factors
    • 03:29
      Band reject (Br) / notch filters
    • 04:16
      Drawbacks of a notch-only duplexer
    • 05:21
      Bandpass (Bp) filters
    • 06:52
      Combined bandpass and band-reject duplexer
    • 07:43
      Aside: about duplexer tuning
    • 08:52
      About duplexer measurements
    • 09:46
      Common duplexer measurements
    • 10:07
      Attenuation
    • 11:15
      Example attenuation measurement – Br only duplexer
    • 12:14
      Example attenuation measurement – Br / Bp duplexer
    • 13:12
      Example attenuation measurement – Br / Bp duplexer (alt.)
    • 14:02
      Isolation
    • 15:02
      Example isolation measurement
    • 15:41
      SWR / return loss
    • 16:42
      Example return loss measurement
    • 17:23
      Duplexer vs. diplexer
    • 18:54
      Summary
    How to check SWR on a Duplexer for GMRS two way radio ...
    YouTube · GMRS _two_way_radio
    Nov 8, 2022
    YouTube · GMRS _two_way_radio
    5:16
    To check SWR on a duplexer, connect the low side to your SWR meter's antenna port and the meter's transmit to the radio.
    GMRS _two_way_radio
    YouTube·
    Nov 8, 2022

    How to check SWR on a Duplexer for GMRS two way radio ...

    YouTube·GMRS _two_way_radio·Nov 8, 2022
    YouTube
    Getting Started with the ZNB3000 – Duplexer Measurements
    YouTube · Rohde & Schwarz
    Aug 28, 2025
    YouTube · Rohde & Schwarz
    14:15
    Learn to measure standing wave ratio (SWR) or return loss on a ZNB3000 to quantify reflected power at each duplexer port.
    Rohde & Schwarz
    YouTube·
    Aug 28, 2025

    Getting Started with the ZNB3000 – Duplexer Measurements

    YouTube·Rohde & Schwarz·Aug 28, 2025
    YouTube
    In this video
    • 00:00
      Introduction
    • 00:18
      Suggested viewing
    • 00:38
      A short overview of duplexers
    • 02:02
      Testing duplexers with the ZNB3000
    • 03:06
      Common duplexer measurements
    • 03:49
      Configuring S-parameter measurements
    • 04:44
      Configuring additional sweep parameters
    • 05:37
      Results views
    • 06:01
      Markers
    • 06:33
      Limit lines
    • 07:07
      Attenuation
    • 08:21
      Attenuation – measurement example (Br only duplexer)
    • 08:58
      Comparing low and high paths
    • 09:30
      Attenuation – measurement of a Bp / Br duplexer
    • 10:04
      Isolation
    • 11:03
      Isolation measurement – low to high
    • 11:24
      SWR / return loss
    • 12:21
      SWR / return loss measurement – low side
    • 12:51
      Summary
    View all
    People also ask
    What is the benefit of low SWR?
    An error has occurred. Please try again later.
    What does an Uhf duplexer do?
    The primary function of a UHF duplexer is to separate transmit (Tx) and receive (Rx) paths: Transmit Path: Allows the transmitter to send signals in the designated frequency range while blocking the receive band.Sep 17, 2025

    UHF Band Duplexer: Functions, Applications and Benefits - UIY Inc


    UIY Inc
    https://www.uiyinc.com › News › UHF_Band_Duplexer_...
    UIY Inc
    https://www.uiyinc.com › News › UHF_Band_Duplexer_...
    What does VSWR 1.5 1 mean?
    In summary, a low VSWR is desirable because it indicates most of your RF energy is doing useful work (getting to or from the antenna) rather than bouncing back. For example, a VSWR of 1.5:1 means ~96% of the power reaches the antenna, whereas a VSWR of 3:1 means only 75% does – a big difference in delivered power.Jun 9, 2025

    VSWR Calculator: What is VSWR and How To Calculate It - Ezurio


    Ezurio
    https://www.ezurio.com › resources › vswr-calculator-wh...
    Ezurio
    https://www.ezurio.com › resources › vswr-calculator-wh...
    What is a good VSWR for antenna?
    The range of values for VSWR is from 1 to ∞ . A VSWR value under 2 is considered suitable for most antenna applications. The antenna can be described as having a “Good Match”. So when someone says that the antenna is poorly matched, very often it means that the VSWR value exceeds 2 for a frequency of interest.

    What is meant by the VSWR of an antenna? - MobileMark


    Mobile Mark
    https://www.mobilemark.com › about › faq › what-is-me...
    Mobile Mark
    https://www.mobilemark.com › about › faq › what-is-me...
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    Checking duplexer


    RadioReference.com Forums
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    RadioReference.com Forums
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    Low SWR, but also very low forward power : r/amateurradio


    Reddit · r/amateurradio
    20+ comments · 2 years ago
    Reddit · r/amateurradio
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    When I connect the duplexer the Forward power drops to ~3W, with an SWR of 1.01:1 and Reflected power of 0.00W. What is happening here? With ...Read more
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    TXRX 2m (VHF) 400W Duplexer


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