MFJ-1026 t/r delay cable

Discussion in 'Amateur Radio Equipment Reviews' started by 9W2WPZ, Oct 3, 2017.

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  1. 9W2WPZ

    9W2WPZ Ham Member QRZ Page

    hai there, sorry for my bad english.

    i have buy 2nd hand mfj-1026 noise canceling. after a few read, this product seems have to use a t/r delay cable to bypass the product when TX.

    can i get help about this cable, how do it look & how to hook it up from mfj-1026 to icom 7300.

    i really have no idea how this thing going.

    i hope someone can help me to clarify it. really appricieate it.

    best regard de 9W2WPZ
  2. 9W2WPZ

    9W2WPZ Ham Member QRZ Page

  3. G3YRO

    G3YRO Ham Member QRZ Page

    When you Transmit, you obviously need to by-pass the MFJ box . . . so it has a Relay inside to do that.

    However, if you DON'T connect up the Transmit line to your rig, it will still work, as the MFJ has RF sensing.

    You don't need to connect anything to use the RF Sensing, but you need to have a certain amount of Delay on the relay, to stop it going on and off all the time - that is what the front panel control marked T/R DELAY is for.

    But . . . much better to connect the Relay to your rig's Transmit line - you just connect to the Phono socket on the back marked T/R CONTROL . . . then you can turn the DELAY control right down.

    Roger G3YRO
  4. VK5FPAC

    VK5FPAC Ham Member QRZ Page

    By-Pass has a light bulb inside to soak up to 100W RF coming onto the receive antenna.
    Exceed 100 W in the received RF and you blow the bulb and kill your 1026!
  5. VE7TNN

    VE7TNN Ham Member QRZ Page

    Bypass the bulb but add a DX Engineering receiver guard rf limiter DXE-RG-5000. de VE7TNN[​IMG]

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