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ADP (Adaptive Pre Distortion)

w5ap
w5ap Member ✭✭
in SmartSDR for Windows

Anyone else using the new ADP?

I've been doing some testing with my 8600M with ADP on or off

and with an amp.

I'm not seeing any improvement with ADP on as the displayed passband is very wide ie, the artifacts are extending out 10 Khz either side of the transmitted passband. with ADP off, I'm seeing the artifacts extend +/- 5Khz. Signal reports are excellent either way. Same image with the amp on or off (of course, the amp output is not being sampled as it is a SPE 2K-FA) I have a PGXL but not at this QTH

So I'm not sure what the panadapter slice is showing? Above the artifact display, the passband is very straight-edged vertically. So the signal is probably great.

But wondering what others are seeing. I'll keep looking for a contact with someone who has a panadaptor display.

Comments

  • David Decoons, wo2x
    David Decoons, wo2x Member, Super Elmer Moderator

    I'm on 80 meters using it right now. Definitely makes a difference. Not huge but now my signal is on par with people running the Anan radios.

    Dave wo2x

  • David Decoons, wo2x
    David Decoons, wo2x Member, Super Elmer Moderator

    Also, what you see in the panadapter when transmitting is NOT what is actually going over the air. Have someone close to you with a good panadapter on their radio do pictures of your ADP off and on.

  • John KB4DU
    John KB4DU Member ✭✭✭✭

    On the Flex, the transmitted signal seen on the display is basically what “leaks” into the receiver from the transmitted signal.

  • David Decoons, wo2x
    David Decoons, wo2x Member, Super Elmer Moderator

    it is pre transmit filtering so what actually goes out is much cleaner. Do the full duplex setup that Ken, NM9P has on YouTube to see your transmit signal coming back in the receiver.

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