FM Deviation?

Discussion in 'Becoming a Ham - Q&A' started by K7TUX, May 29, 2009.

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  1. KM3F

    KM3F Ham Member QRZ Page

    As an example; the Kenwood TS 480 has a 'narrow band' FM button function on the control head to use when using FM below 29.0.
    Reducing the deviation below 29 is little known unless someone brings up the question.
    'Without seeing' the mod in detail, be sure it's not a CB type mode that makes the use of the mode below 29, illegal to transmit with.
  2. K8MHZ

    K8MHZ Ham Member QRZ Page

    You asked how YOUR ability to transmit was affected:

    I was just giving what I thought was an accurate, honest answer.

    Perhaps I misunderstood the question.
  3. W5OMR

    W5OMR Ham Member QRZ Page

    28.000-28.070CW 28.070-28.150RTTY 28.150-28.190CW 28.200-28.300Beacons 28.300-29.300Phone 28.680SSTV29.000-29.200AM 29.300-29.510Satellite Downlinks 29.520-29.590Repeater Inputs 29.600FM Simplex 29.610-29.700Repeater Outputs

    FM starts at 29.3.
  4. W5OMR

    W5OMR Ham Member QRZ Page

    Sorry, the formatting didn't translate well. Nor, did I address the question properly.

    For Technicians, the correct answer is, FM is not allowed between 28.3 and 28.5. Technicians can only operate in that particular subband on 10m.

    Typical FM deviation is +/- 5kHz. That's a 2.5kHz excursion up and down the band from the center frequency. 2.8kHz means 5.6kHz total space requirement. While legal on HF (FM stations should not occupy more space than a conventional AM signal - paraphrased) the receiver is set to +/- 5kHz and you are likely to operate outside of the band pass of the receiver you are attempting to communicate with. You could sound like you're 'breaking up' or your audio is failing. Keep the deviation set to the standard +/- 5kHz, talk across the microphone element to avoid pops and you'll be fine.

    73 = Best Regards
  5. W5OMR

    W5OMR Ham Member QRZ Page

    need more coffee ;-)

    May only operate ^USB^ in that particular subband on 10m.

    (note to self: *must* drink more coffe before posting messages... :rolleyes: )
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