Predistortion Outputs?

Butch

I'm curious what the two Predistortion Outputs on the back of the PG-XL are for?  Perhaps something to do with a future Adaptive Predistortion feature?  Is there a link to the PG-XL manual available yet?

Tim - W4TME

They are an attenuated tap for RF feedback needed for adaptative pre-distortion.
The PGXL manual is still in draft form.  It should be made publicly available in the near future.

Butch

Tim, is the purpose of the adaptative pre-distortion feature to provide less distorted  transmit audio?

Tim - W4TME

It isn't just for audio as it operates on the transmitted RF.
https://en.wikipedia.org/wiki/Predistortion

Butch

Where will these adaptative pre-distortion ports connect to?

Tom

Here is an interesting presentation:
http://video.openhpsdr.org/HRF2014/PureSignal1.2.mp4

Tom, SP7WT

Tim - W4TME

KF4HR - an RF input on the radio