[hpsdr] Munin revisited.

[Warren C. Pratt]

Hi Helmut,

Yes, I remember in the past that you mentioned Alfred's software 
solution.  Congratulations to him on this work.

If one can correlate, at the sample level, the TX outbound packets with 
the incoming packets received from the amplifier output, this is 
certainly possible.  Then, the only remaining difference is the response 
of the down-conversion filters.  I understand that he cannot share that 
solution.

I have not seen the great magus here, recently at least.:-)

73,

Warren  NR0V


On 8/4/2017 11:53 PM, Helmut Oeller wrote:
> Hi Warren,
>
> I dare to disagree with the great magus, hi.
>
> Since more than two years my friend Alfred, HB9EPU, employs adaptive pre-distortion at his Atlas-based radio with good results. The Mercury and Pennylane use standard firmware versions.
> The difference to PS is that he does not use separate DDC/DUC to prepare data for correction. He found an effective way to correlate the originally generated TX base-band samples in the PC with the incoming RX base-band samples (through the 'main' RX). As all data are available there, the complete job can be done in the PC and the method perhaps implemented at least in a derivate of OpenHPSDR PowerSDR. But the crux is that Alfred has developed his own operation software and uses proprietary SW-packets licensed on him. This makes it actually impossible to share the SW solution.
>
> 73, Helmut, DC6NY