FT-991/A Power Settings - Explained

Discussion in 'General Technical Questions and Answers' started by PY2RAF, Sep 8, 2019.

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  1. PY2RAF

    PY2RAF XML Subscriber QRZ Page

    Are you a FT-991/A owner? Got puzzled on why some power settings that you made that were overridden?

    Well, I was. Plenty of times.

    Until I finally took a investigative approach and went to find out what are variables involving the power settings.

    First, under the power perspective, the radio has two main groups: Frequencies and modes. And there are lots of sharing between them. Namely:

    Frequency-wise, the radio is organized in 4 groups:
    1. The HF band (1.8-28 MHz);
    2. 50 MHz;
    3. 144 MHz
    4. 430 MHz.
    In terms of modes, we have three groups:
    1. Data LSB/USB, RTTY LSB/USB, Data FM, C4FM, FM, CW LSB/USB;
    2. LSB/USB
    3. AM
    How does that translate?

    The FM, Digitals and CW all share the same power setting in its respective band group.
    LSB/USB and AM has its setting of its own also in its respective band group.

    See a few examples.

    • If you change your power in LSB mode in 7 MHz, this power setting will be the same for all HF bands for both LSB and USB, and will not reflect in 50, 144 and 430;
    • If you change your 50 MHz in FM mode, this setting will replicate to Data LSB/USB, RTTY LSB/USB, Data FM, C4FM, FM and CW LSB/USB only in the 50 MHz band, and will not replicate in any other band
    • Same for 144 and 430 MHz

    If a image is worth a thousand words:

    [​IMG]

    Hope that helps someone.

    73 - Rodrigo.
     

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