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Yaesu FT-857/897 AM operation.

Discussion in 'Yaesu' started by Captain Kilowatt, May 27, 2010.

  1. Captain Kilowatt

    Captain Kilowatt Professional Amateur Staff Member

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    The FT-857/897 radios have a hidden menu. It is turned OFF by factory default. You may enable it by entering the regular menu mode by pressing the [FUNC] button for a second or so. Advance to menu item #1 and rotate main tuning dial so that the display says ON. Press [FUNC] button again to exit menu mode. Turn radio OFF. Press and hold buttons [A] and [C] under the display while turning radio back on. The radio will emit a series of beeps and enter the hidden service menu mode.

    CAUTION: DO NOT MAKE ANY ADJUSTMENTS TO ANYTHING IN THIS MENU WITHOUT FIRST COPYING THE DEFAULT SETTING! THIS IS A SERVICE MODE AND THE SETTINGS ARE UNIQUE TO EVERY RADIO.



    Advance to menu item #60 which is the AM carrier level ALC control. The display should show something like:

    AM-CAR-LEVEL 125 AM 21.225.13

    Note that the value of 125 is unique and will change from one radio
    to the next. Mine was set to 142. While monitoring the ALC level
    press the PTT and adjust the main tuning knob for little or no
    ALC indication. This will allow the carrier to peak to something near
    100-120 watts like it should. I had to set my radio to 96. The
    problem is that the factory settings limit the carrier to 25-30
    watts and the ALC will not allow it to peak any higher as it
    should be able to do. After making the adjustment press the
    [FUNC] button again to exit the setup for that menu item and
    turn the radio OFF. Turn the radio back on normally and enjoy
    MUCH better quality AM transmissions. I find it best to not
    use the processor or if you do use very light processing on AM.
    You may also find it useful to set the radio to use the DSP settings
    for TX as well as that allows you to tailor the high and low
    limits of your audio.

    Prior to making this simple change I had very muffled audio
    on AM. After, I had MUCH improved audio that was no longer
    muffled and the power meter actually moved with modulation.
    Above all keep the carrier to no more than 25-30 watts.




    #1
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  2. Quiksilver

    Quiksilver Active Member

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    Sweet!
    Thanks for the info. Adjustments went fine. Mine is at AM-CAR-LEVEL 115 AM 21.000.00. And carrier was metered right at 25W. First R/C was loud & Clear.
    Thanks again!
    #2
  3. highaltitudeDXer

    highaltitudeDXer New Member

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    What did you set #51 and #52 to? That's the ALC control.
    #3
  4. Captain Kilowatt

    Captain Kilowatt Professional Amateur Staff Member

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    No it is not the ALC control. Those are just the meter calibration adjustments. The ALC control for AM miode is service menu item number 60.
    #4
  5. Turbo T

    Turbo T Active Member

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    My Yaesu FT 857's receive on AM sounds muffled, yet transmits fine on AM. Does anyone know why and what the fix is for it? Thanks.
    #5
  6. Captain Kilowatt

    Captain Kilowatt Professional Amateur Staff Member

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    DSP filter settings? Pass Band Tuning offset? IF Shift setting? Check these first.
    #6
  7. Turbo T

    Turbo T Active Member

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    Which DSP filter? It has one for CW, one for noise reduction, one for notch and one for bandpass.

    Where's the pass band tuning offset? I have the manual but didn't see it.

    IF shift, I'll check.

    Thanks
    #7
  8. Turbo T

    Turbo T Active Member

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    Ok IF shift setting is center. I tried turning off the NB too
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