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Brian,<br>
Based on extensive testing by Mukesh, KE3VG, with a ClearRF
sampler, good results were achieved on 20 and 40 meters when the
external sample level was 6db higher than the observed internal
crosstalk level on that band. This may not be practical on the
higher bands due to the higher crosstalk at higher frequencies.<br>
<br>
A table of optimal PureSignal "ATT on TX" attenuation settings
was constructed using a barefoot ANAN-100D and various PowerSDR
settings. Here is the one from my barefoot ANAN-100D:<br>
<br>
<font face="Courier New, Courier, monospace">PowerSDR 3.2.9 Angelia
2.8, ANAN-100D<br>
ATT on TX Attenuation level needed for 1 db above ADC overload at
various PowerSDR settings:<br>
<br>
Band Alex Alex Man. Bypass Alex Auto and<br>
Auto Byp 55mhz on Tx Bypass on Tx<br>
(EXT1,2)<br>
160 8 0-RED 0-GRN 0-YELLOW<br>
80 12 0 5 5<br>
40 15 2 10 5<br>
20 19 14 15 18<br>
17 21 15 17 18<br>
15 22 20 19 20<br>
12 27 24 18 20<br>
10 22 23 18 21<br>
6 28 26 19 28<br>
<br>
Mukesh used a similar table he created with his Barefoot ANAN-100D
using internal crosstalk. Then, with his ClearRF sampler attached
to the output of his Amp Supply amplifier he increased his ATT on
TX attenuation to 6 db above the level shown in his barefoot
table. He then adjusted his ClearRF sampler output to a point 1
db past the point where ADC overload was experienced. He acheived
~45dbc using this method. YMMV.<br>
<br>
Bill KC9XG<br>
</font>
<div class="moz-cite-prefix">On 2/26/2014 9:40 AM, Brian Lloyd
wrote:<br>
</div>
<blockquote
cite="mid:CAE3hgTdpLvstKp+C9MrNX_1+4EQVLFZf6YHEwV3nYZ9fD8pN4g@mail.gmail.com"
type="cite">
<pre wrap="">***** High Performance Software Defined Radio Discussion List *****
</pre>
<br>
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<br>
<div dir="ltr">Now that people are experimenting with PureSignal
with external amps, I think I see a possible trend for an error
that can be made that results in less improvement than might
otherwise be possible with better configuration. </div>
</blockquote>
SNIPPED some great info.<br>
<br>
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