Predistortion für den Red Pitaya.
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Hello Jörg and Detlev,
I've just released a new version (0.94-1025) of the Red Pitaya SDR application compatible with HPSDR. It works much better with the amplifier linearization (PureSignal) part of the PowerSDR mRX PS program. You can find more details in the following post on the Red Pitaya forum:
http://forum.redpitaya.com/viewtopic.ph ... 5013#p5013
This new version is now available via the Red Pitaya application market place. I've also updated the customized SD card image.
Attached are two spectra showing how the amplifier linearization
(PureSignal) works with the Red Pitaya output (OUT1) connected to the Red Pitaya input (IN2) with a 50 Ohm termination.
Could you please test it with a real power amplifier connected to Red Pitaya?
Best regards,
Pavel
I've just found a solution to the Pure Signal compatibility problem in the FPGA configuration of the SDR HPSDR application. It's fixed in the following commit:
https://github.com/pavel-demin/red-pita ... 9deb701a44
The new version (0.94-1025) works much better with the amplifier linearization (PureSignal) part of the PowerSDR mRX PS program. This new version is now available via the Red Pitaya application market place. I've also updated the customized SD card image.
To use Pure Signal with Red Pitaya, some PowerSDR settings should be adjusted. The following screenshots show the settings that work for me. To access the "Calibration Information" panel press Ctrl+Alt+i. The attenuated feedback signal from the amplifier should be connected to IN2.