[hpsdr] Metis step attenuator hang-up

[H.A.Meijer]

Hi John,

I'm seeing sometimes same things at my Alex filter boards when going 
from TX to RX.
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,
  you can see this at the panadaptor  . (I did put the 31dB att on when 
TX, to prevent rx overload in the setup).
So maybe a timing problem at the spi data bus to the LP/HP filters?.

Bert

Op 26-6-2013 17:25, John Ackermann schreef:
> ***** High Performance Software Defined Radio Discussion List *****
>
> 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.
>
> 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.
>
> 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.
>
> 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?
>
> Thanks!
>
> John
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