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FT-857D reduced Rx range after MARS mod

Discussion in 'General Technical Questions and Answers' started by HB9DNA, Sep 11, 2021.

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  1. HB9DNA

    HB9DNA Ham Member QRZ Page

    Hello. I just performed my MARS mod on my 10y+ old European FT-857d and now the RX range is limited to 144-146MHz and similar for other bands.... Help, did I mess it up? Thanks
  2. WA9SVD

    WA9SVD Ham Member QRZ Page

    You may have gotten the wrong info?
  3. AI5DH

    AI5DH Ham Member

    Most likely, yes. Fortunately, you did not brick the radio, so it can be fixed. Educated guess you have a jumper wiring error or had incorrect configuration information. Double-check your work and information.
  4. N2ZD

    N2ZD Ham Member QRZ Page

    You messed up the diode configuration. The cpu is preset with the worlds band plans and the radios are set by diodes to operate on specific frequencies by region. if you remove or add the wrong diodes, the radio may reset to the wrong zone.

    Regards Richy N2ZD
    WA9SVD likes this.
  5. SA4MDN

    SA4MDN Ham Member QRZ Page

    did you do a full reset after the mod
  6. WA9SVD

    WA9SVD Ham Member QRZ Page

    To expand, different "versions" of the radio can have different diode configurations, (and thus, different diode/jumper locations or designations.) Did you (try to) use the proper mod for YOUR version of the transceiver? (And of course, do a FULL reset?)
    N2ZD and N8YX like this.
  7. N2ZD

    N2ZD Ham Member QRZ Page

    I believe he set his to the Japan frequencies. As I recall, Japan has a very limited 2m band. Also other countries may have a different “mod” than we do here in the states for that particular radio. Just throwing it out there..
  8. WA9SVD

    WA9SVD Ham Member QRZ Page

    Japan or Europe? Most (if not all) of Europe (including the U.K.) have only 144-146 MHz. as an amateur allocation. (His description as the "European" version of the radio seems like a tip-off.)
    N2ZD likes this.

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