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<div class="moz-cite-prefix">Hi John,<br>
<br>
I'm seeing sometimes same things at my Alex filter boards when
going from TX to RX.<br>
But also sometimes I see that when going from RX to TX that not
always the 31dB attenuator is switched on in a correct way,<br>
you can see this at the panadaptor . (I did put the 31dB att on
when TX, to prevent rx overload in the setup).<br>
So maybe a timing problem at the spi data bus to the LP/HP
filters?.<br>
<br>
Bert<br>
<br>
Op 26-6-2013 17:25, John Ackermann schreef:<br>
</div>
<blockquote cite="mid:51CB07D7.4070208@febo.com" type="cite">*****
High Performance Software Defined Radio Discussion List *****
<br>
<br>
I operated my TAPR-built Hermes, ANAN-10 amp, and TenTec 714 100W
amp for Field Day. The software was mRX FFT 3.0.16 running on a
Lenovo X200 laptop with Core2 Duo P8600 2.4 GHz CPU and 4GB RAM.
The OS is Windows XP with current updates. I'm running at
192ksamples with default buffer sizes.
<br>
<br>
Things generally worked just fine -- in fact, excellently, but I
noticed one anomaly and wanted to see if this was a known issue,
or if there was a fix.
<br>
<br>
Several times the step attenuator got stuck at 31dB in receive
mode. I noticed this under at least two circumstances: (a) a
failed software start, where I hadn't let the IP stack do its
thing before starting the radio, and then having to re-start
PowerSDR, and (b) sometimes when returning from TX to RX in CW
mode. When it happened on the TX/RX transition, I usually heard
some noise bursts on the monitored audio during the TX period.
<br>
<br>
The CPU load shown by PowerSDR seems to stay in the 30% range, and
there are no other apps running. Is what I'm seeing likely to be
a bug, or a resource deficiency? And are there any suggested
fixes?
<br>
<br>
Thanks!
<br>
<br>
John
<br>
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