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FT8 Frequency Explanation

Discussion in 'Software Defined Radio (SDR)' started by KN4JFL, Apr 24, 2020.

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  1. KN4JFL

    KN4JFL Ham Member QRZ Page

    I've recently started trying this mode with WSJT-X and I'm really enjoying it. One thing bugs me in that I feel like I'm missing a basic understanding though - the two different frequencies used.

    For example: On 80m I tune my radio to 3.573 MHz (the "FT8" frequency for 80m, right?). But then within WSJT-X I transmit and receive on 1150 Hz (just picked that numner as an example). Does that mean the actual frequency I'm using is 3.573 MHz plus 1150 Hz, or 3.574150 MHz?

    How do those two numbers interrelate?
  2. WG7X

    WG7X Platinum Subscriber Platinum Subscriber QRZ Page

    Yeah, pretty much. You're operating in the 3KHz width of an SSB signal. So, it's just like you said: the base frequency +- the offset in Hz.
  3. AE1N

    AE1N Ham Member QRZ Page

    While your wsjt-x screen is up, press the F1 button ...
    Layne AE1N
  4. KP4SX

    KP4SX Premium Subscriber QRZ Page

    Yes. You are just a little signal about 50 Hz wide inside the "band' like everyone else. 3573.000 would be zero on the waterfall display. I guess you are aware that you can change freqs at will.

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