ADP (Adaptive Pre Distortion)

w5ap

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.

David Decoons, wo2x

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

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

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

David Decoons, wo2x

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.

W2ECK

Any suggestions on RF samplers to use? I have an 8600 and KPA 500. Have no idea how expensive rf samplers are.

73 Paul W2ECK

KD0RC

Hi Paul, this is the one that I got for my Flex 8600 and KPA-500 from Clean RF:

https://www.cleanrf.com/products.html#RF-S2K

They are around $140 and handle full legal limit. I installed it and have not touched it since - it just works.

W2ECK

Len

Is there any documentation on ADP hook-up and use for 8000 series?

73 Paul w2eck

KD0RC

Hi Paul, the connections are very straightforward. Connect the output of the amp to the input of the RF sampler (SO239). Connect the output of the sampler (SO239) to your tuner or antenna. Connect the sampled (-60 dB) port of the sampler (BNC) to an unused receive-only port on the Flex (RXA, RXB, XVTA, XVTB).

Go to the APD tab of Radio Setup and select the RX only port that you plugged the sampler output into. ANT1 and ANT2 refer to the antenna port on the radio that your amp is connected to.

In the example below, the sampler is connected to the amp on Ant1, with the -60 dB port connected to RXA of my 8600.

Make sure to turn on APD:

Erik Carling EI4KF

https://helpdesk.flexradio.com/hc/en-us/articles/37416482166171-SmartSignal-automatic-adaptive-pre-distortion-FAQ

W2ECK

Len & Erik

Much appreciate the help. Think I have everything I need now to get it working ( don't have sampler yet - but soon)

73 Paul w2eck

W2ECK

Len

Received the sampler. Question regarding the variable RF control. How do have it set? It controls the sample reduction?

Paul w2eck

KD0RC

Hi Paul, just leave it turned all the way up (fully clockwise). I talked to Tyler at Clean RF and he added that for people who need to change the sample amount for certain applications. All the way up is 60 dB which is great for Flex APD.

W2ECK

Len

Thanks for for the help again, should be ready to go now.

73 Paul W2ECK