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Kenwood TH-D74 Extended Transmit Mod

Discussion in 'Kenwood' started by Moleculo, Oct 27, 2017.

  1. Moleculo

    Moleculo Administrator
    Staff Member

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    I've owned the Kenwood TH-D74 since the first week it became available and finally decided to perform the extended transmit mod. Some of the sites that have already published this mod make it seem like a big deal, but it's really pretty easy. Here are the steps:

    1. Remove the antenna and rotary knobs on the top right. The rotary knobs just pull off.
    2. Remove the SMA nut. If you plan on doing this type of work for all types of HTs, you should consider purchasing the proper tool for the job. I use one of these inexpensive $7 wrenches that you can find on ebay: https://www.ebay.com/itm/310808572946?rmvSB=true. After the knobs and SMA nut is removed, your radio will look like this:
    [​IMG]

    3. Remove the battery and the four screws holding the aluminum back to the radio body.
    [​IMG]

    At this point, the front cover can be easily be removed from the body. You'll need to unhook the rubber PTT cover from the main chassis, which was already done in the pic above.

    4. Once you separate the radio cover from chassis, lay the cover down on its face. There is a ribbon cable connecting the buttons to the main board; most of the instructions published want you to disconnect this ribbon cable but it is completely unnecessary.

    [​IMG]

    5. On the main radio board, remove R761. I just used a fine point soldering iron and it came off easily.



    [​IMG]

    Reassemble the radio, reset it and you're good to go. Here is the TX range after the mod:
    136-174 Mhz
    216-235 Mhz
    410-470 Mhz.

    I have not noticed any ill side effects from performing this mod.
     
    L2, drgrant, ButtFuzz and 5 others like this.

  2. TC Trader

    TC Trader Member

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    Has anyone try this same conversion with the TH-D72A?
     
  3. binrat

    binrat WDX Club Coordinator
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  4. Terminator X

    Terminator X New Member

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    Hello all, im looking to extend the recive range of the d74 to 500 mhz any ideas?
     
  5. L2

    L2 Active Member

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    Thanks for the write up. Just ordered a wrench.
     
  6. Norwood_d

    Norwood_d Member

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    Hi all! New to the forum. I did the mod and nearly everything works as it should, but I’m unable to scan at all. Any thoughts?

    Daniel
     
  7. NightThumper

    NightThumper Active Member

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    First are you in memory mode. Key #1 puts you in VFO and Key #2 puts you in memory. Hold down the #2 key and it should start scanning your memories. While in memory mode if you hold down the right or left arrow on the joy stick you will scan through your memory groups you have assigned. I believe you should at least have GRP 0 and Weather to start out with.
     
  8. Norwood_d

    Norwood_d Member

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    Geez... it’s working now. I must have had some other setting turned on when it wasn’t working for me last weekend?? I was using the Nifty Mini-Manual and trying buttons 1 & 2 but it wasn’t working. Fussed with it for 20 minutes... Figured I broke it somehow with the mod. But now that I try it, it works like it should. Who knows...

    Thanks for helping. Clearly I need to spend more time with the radio...
     
  9. NightThumper

    NightThumper Active Member

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    Your welcome. TH-D74a has as you know has many features which are easy to forget if you’re not using it on a regular basis. The Nifty Manual I find is very good. Enjoy it’s a great HT.
     
    L2 likes this.

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