[hpsdr] Pure Signal 2

[Scott Traurig]

See https://apache-labs.com/community/viewtopic.php?f=20&t=2409

73,

Scott/w-u-2-o

On Tue, Feb 13, 2018 at 8:11 PM, Richard Grubb <richard.n.grubb at comcast.net>
wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
>
> 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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