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Power drop-off at extremes of FT-8 passband

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Phil N3ZP
Phil N3ZP Member ✭✭
in FLEX-6000 Signature Series

I have read on several Flex forums not to use "Fake It" in FT8 for frequency control in WSJT-X because the Flex filtering is flat across the audio passband. I usually notice a slight power drop off at the low and high extremes. I am using a 3K filter width and run DIGU. Is this normal and possibly caused by the DAX driver or WSJT-X?

Comments

  • Larry _ NY8T
    Larry _ NY8T Member ✭✭✭
    edited September 2020
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    Just open your TX filter a little more, I use 0 to 4.5 Khz.

  • Phil N3ZP
    Phil N3ZP Member ✭✭
    Options

    Thanks, I'll try that.

  • Tim - W4TME
    Tim - W4TME Administrator, FlexRadio Employee admin
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    @Phil N3ZP I use "Fake it" all the time except when I am on 60m. It keeps the transmit signal in the middle of the TX filter and there is no latency degradation either. If the tones are really low in frequency, you are losing signal strength because it take more RF energy to transmit a low frequency tone than a higher frequency tone.

  • Phil N3ZP
    Phil N3ZP Member ✭✭
    Options

    Thanks, Tim. It makes sense now that you say it that a low tone needs more RF.

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