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    AI Overview
    VHF 6 cavity, square duplexer, 136-174 MHz, 350W, N-type ...
    High-power 350W duplexers are typically 4-cavity or 6-cavity Pass-Reject/Vari-Notch units designed for VHF or UHF base stations. Key models include the 406-512 MHz Sinclair Q3220E/Q3220-E, 118-174 MHz Telewave TPRD-1344C/1554, and 380-520 MHz ZCG ZSGQ-450-R. They offer high isolation (
    >75
    dB
    ), low insertion loss (
    <1.5
    dB
    ), and use N-Female connectors for high-RF environments. 
    Key Features & Common Models: 
    • Power Handling: 350 Watts average input power.
    • Configurations: Generally 4-cavity for compact, efficient performance (e.g., BridgeCom TXRX 350W), or 6-cavity for higher isolation (e.g., Manirontronics High Power).
    • VHF Models: Telewave TPRD-1554 (144-174 MHz), Telewave TPRD-1586 (148-174 MHz, 300 kHz sep).
    • UHF Models: Sinclair Q3220E (406-512 MHz, 5 MHz sep), ZCG ZSGQ-450-R (380-520 MHz).
    • Design: Typically featuring Vari-Notch or pass-reject designs to reduce interference, with silver-plated loops for low noise. 
    Common Applications: 
    • High-power LMR (Land Mobile Radio) systems.
    • Base station transmitter/receiver isolation.
    • Government and commercial trunking networks. 
    Performance Specifications: 
    • Isolation: Typically
      >75
      dB
       (4-cavity) to
      100
      dB
       (6-cavity).
    • Insertion Loss:
      <0.8
      dB
       to
      1.5
      dB
       depending on frequency separation.
    • Connectors: N-Female. 
    • 4-Cavity TXRX 350W UHF Duplexer – BridgeCom Systems
      The TXRX 350W UHF Duplexer is a custom-built and tuned duplexer with a Vari-Notch® design. The Vari-Notch® design provides low-los...
      BridgeCom Systems
    • Telewave VHF Pass-Reject Duplexer TPRD-1554 144-174 Mhz 350W
      Telewave VHF Pass-Reject Duplexer TPRD-1554. This duplexer can handle frequencies in the 144-174 MHz range with a max power output...
      Used Radios
    • UHF 4-pole duplexer, 400-520MHz, insertion loss 1dB, 50 Ohm, N ...
      The ZSGQ-450-R 350W UHF duplexer is configured with 4 cavities, suitable for UHF, Terrestrial trunked radio, Land Mobile Radio (LM...
      ZCG Scalar
    Show all
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    Web results

    Q3220E 406-512 MHz Duplexer 5MHz Sep IL .8dBMax ...


    Talley
    https://www.talleycom.com › product
    Talley
    https://www.talleycom.com › product
    8dBMax ISOL 75dBMin 350W. Item #SINQ3220E. Designed for operation in the 406-512 MHz band, this compact 4-cavity duplexer provides excellent ...Read more
    350W duplexer from www.talleycom.com
    $1,397.81 · 5–9 day delivery · 30-day returns

    Telewave VHF Pass-Reject Duplexer TPRD-1554 144- ...


    Used Radios
    https://used-radios.com › products › telewave-vhf-pass-...
    Used Radios
    https://used-radios.com › products › telewave-vhf-pass-...
    This duplexer can handle frequencies in the 144-174 MHz range with a max power output of 350 watts. List cost on this unit is over $1400.00. Free tuning is ...Read more
    350W duplexer from used-radios.com
    $975.00 · 6-day delivery · 30-day returns

    4-Cavity TXRX 350W UHF Duplexer


    BridgeCom Systems
    https://www.bridgecomsystems.com › products › 4-cavit...
    BridgeCom Systems
    https://www.bridgecomsystems.com › products › 4-cavit...
    Proven low-loss and low-noise construction techniques are used such as welded cavity construction; silver-plated loops, Alballoy®-plated integrated loop plates ...
    350W duplexer from www.bridgecomsystems.com
    $1,666.00 · In stock · 5.0(4) · $47.46 delivery · 30-day returns

    Sinclair Q3220E UHF Duplexer 406-512 MHz 350W RES- ...


    eBay
    https://www.ebay.com › itm
    eBay
    https://www.ebay.com › itm
    The Sinclair Q3220E is a 4-cavity, pass-reject UHF duplexer designed for 406-512 MHz, featuring 350W power handling, N-Female connectors, and a minimum 5 MHz ...Read more
    350W duplexer from www.ebay.com
    $285.00 · In stock · 5.0(1) · $7.95 delivery

    Telewave TPRD-1344C 118-136 MHz VHF Duplexer


    American Communication Systems
    https://www.ameradio.com › Telewave › Duplexers VHF
    American Communication Systems
    https://www.ameradio.com › Telewave › Duplexers VHF
    118-136 MHz 4-Cavity Bandpass/Reject Duplexer, 4 inch, 350W, N-Female Connector. . Low Price! Qty Discounts, Worldwide Shipping.
    $4,028.00 · 1–7 day delivery · 30-day returns

    40-50 MHz Pass/Reject Duplexer - TPRD0454


    Tessco
    https://www.tessco.com › ... › Duplexers › Base Duplexers
    Tessco
    https://www.tessco.com › ... › Duplexers › Base Duplexers
    TELEWAVE, INC.'s TPRD0454 40 – 50 MHz base station duplexer. 600 KHz frequency seperation, 350 W. Consists of four 5 in cavities. N Female. Factory tuned.Read more
    30-day returns

    Intellitron DU-1202 Duplexer 1.8-225MHz | 500W Power


    GigaParts.com
    https://www.gigaparts.com › intellitron-du-1202-1-8-225...
    GigaParts.com
    https://www.gigaparts.com › intellitron-du-1202-1-8-225...
    Apr 27, 2025 — Shop the Intellitron DU-1202 Duplexer for seamless radio communication. Connect two transceivers to one antenna with 500W power handling.
    $39.95 · In stock · 5.0(1) · Free delivery over $99 · 30-day returns

    350W duplexer N female


    Maniron
    https://www.manirontronics.com › 350w-duplexer-n-fe...
    Maniron
    https://www.manirontronics.com › 350w-duplexer-n-fe...
    The base station duplexer is ideal for high power, close frequency separation installations. These filters are designed for combining two frequencies or ...

    VHF Duplexer 144-174 350W 5 MHz Separation Banpass ...


    eBay
    https://www.ebay.com › ... › Two-Way Radios
    eBay
    https://www.ebay.com › ... › Two-Way Radios
    VHF Duplexer 144-174 350W 5 MHz Separation Banpass Type ; Quantity. 1 available ; Item number. 389047294343 ; Brand. Telewave ; Accurate description. 4.9.Read more
    350W duplexer from www.ebay.com
    $650.00 · $7.95 delivery

    CF-416B - 1.3-170MHz-350-540MHz Duplexer w-Leads


    cometantenna
    https://www.cometantenna.com › ... › Duplexer
    cometantenna
    https://www.cometantenna.com › ... › Duplexer
    ... 350-540MHz Duplexer w-Leads Duplexer. Comet – CF-416B – 1.3-170MHz-350-540MHz Duplexer w-Leads. MSRP $63.50. Purchase Today from your Favorite Dealer. Ham ...Read more
    350W duplexer from www.cometantenna.com
    $63.50 · In stock
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