[hpsdr] Pure Signal 2

[Richard Grubb]

Can somebody please point me to documentation on Pure Signal 2 ? It 
seems to differ in operation from that described in the documentation 
for the original Pure Signal although I found my way around it.

I have implemented Pure Signal 2 on a Hermes/ANAN 10 setup driving a 
Juma 1000 LDMOS PA. At 900 - 1000W. I am using the latest PowerSDR 
interface release (3.4.7) and the latest Hermes firmware. At 900 W into 
a dummy load it takes the first order products in the two tone test down 
by > 30 dB to a level just below -60 dB wrt the single tone. Nice result 
! However whatever feedback level I set (up to each tone at 0 dBm) the 
"Feedback" indicator in the PowerSDR screen flashes red. Does that mean 
two much or too little feedback ? Or just that the feedback is Ok ? 
Thanks for any elucidation

Actually the feedback level seems pretty non critical. With a coupler 
loss of -54 dB I get good results at 10 W barefoot as well as 1000W from 
the Juma

73, Dick
W0QM/G3FNL
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