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<DIV><SPAN class=921275923-12012011><FONT face=Arial>Joe /
K5SO,</FONT></SPAN></DIV>
<DIV><SPAN class=921275923-12012011><FONT face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=921275923-12012011><FONT face=Arial>Thanks so much for the
detailed info. Being new to SDR, I appreciate the guidance to get off to a
fast start.</FONT></SPAN></DIV>
<DIV><SPAN class=921275923-12012011><FONT face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=921275923-12012011><FONT face=Arial>Yes, K2SDR's null steering
demos are impressive. That's just what I'm looking for. I was almost to the
point of buying a Flex 5K just because of that feature, but my friend and fellow
HPSDR member, Frank/WA1GFZ said there's a better way. Yes, learning and
implementing the HPSDR technology is exciting and leading edge for ham
use.</FONT></SPAN></DIV>
<DIV><SPAN class=921275923-12012011><FONT face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=921275923-12012011><FONT face=Arial>I am impressed to see you
have already set up THREE diversity receivers and playing with even more
complex software nulling routines. Count me in as a beta tester soon. I
have a number of high gain, homebrew antenna arrays for HF that I wish to
multi-phase, including Beverages in several directions. My main bands are
40M and 75M Dxing. (Check out QRZ.com for some pics of the
antennas.) Your PowerSDR software work with diversity is much appreciated,
Joe.</FONT></SPAN></DIV>
<DIV><SPAN class=921275923-12012011><FONT face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=921275923-12012011><FONT face=Arial>OK on the Penny and IMD. I
have been on a never-ending quest for years to set up a QRO HF linear amplifier
system that was at least -45db 3rd order IMD. I have accomplished this recently
with my big tube amp, but now my FT-1000D is only about -32 3rd IMD -
a bottleneck problem. Thus the interest in using the very clean 500 mW Penny
output into a chain of SS amps as an IPA. </FONT></SPAN></DIV>
<DIV><SPAN class=921275923-12012011><FONT face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=921275923-12012011><FONT face=Arial>BTW, I received an
informative email from Hans, DL2MDQ, with charts of IMD for Penny. Incredible
numbers at lower HF freqs and lower power levels exceeding -70db 3rd. He
also plans to publish some comparable SS amplifier info concerning CCI
amplifiers that will produce higher power -50db F3 results. (Class
A) I was confused why the PennyWhistle used an
average -32db IP3 linear stage for the very clean Penny exciter.
The bottom line is when we run QRO on the bands, we have a responsibility
to have ultra clean side products to compensate for our higher power. It's
all relative and no one cares how many db down our products are - it's how
loud are we now and are we causing adjacent channel problems as a result? Every
db in better IMD helps.</FONT></SPAN></DIV>
<DIV><SPAN class=921275923-12012011><FONT face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=921275923-12012011><FONT face=Arial></FONT></SPAN><SPAN
class=921275923-12012011><FONT face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=921275923-12012011><FONT face=Arial>* Another benefit of the
HPSDR list is I was contacted by someone who had an HPSDR kit for sale. Except
for the Metis board, an Excalibur and second Mercury board, I should be up and
running in the near future to start some diversity tests. But maybe I will
need three Merc RX's for your new tests, Joe.. :-)</FONT></SPAN></DIV>
<DIV><SPAN class=921275923-12012011><FONT face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=921275923-12012011><FONT face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=921275923-12012011><FONT face=Arial>Thanks again for the help
and I'll be lurking and reading.</FONT></SPAN></DIV>
<DIV><SPAN class=921275923-12012011><FONT face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=921275923-12012011><FONT face=Arial>73,</FONT></SPAN></DIV>
<DIV><SPAN class=921275923-12012011><FONT face=Arial>Tom,
K1JJ</FONT></SPAN></DIV>
<DIV><SPAN class=921275923-12012011><FONT face=Arial></FONT></SPAN> </DIV>
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