[hpsdr] ADC overload problems.

[Dave G4FRE]

I had a similar problem a while back

At Phil's recommendation I used KK's wideband view to see the "big picture"
and I established that a local Dallas 1.7MHz broadcast station was
overloading Mercury and modulating its noise floor (~--19dBm from the
antenna)

I built the WB5WPA BCB reject filter as I described at
http://g4fre.com/bcbreject.htm which stopped the problem. It rejected the BC
station 45dB while attenuating 1.83MHz just 0.4dB

Dave

G4FRE

-----Original Message-----
From: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org] On Behalf Of Jeff Cook
Sent: Tuesday, October 16, 2012 10:29 AM
To: hpsdr at lists.openhpsdr.org
Subject: Re: [hpsdr] ADC overload problems.

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

Thanks George, as usual you are straight to the point and on the ball, 
placing a tick in the appropriate box gets rid of the error warning.

And with the ability to look at the entire spectrum I can see as per 
Dave's suggestion, a very large peak of around -18 dB's down at the 
low-frequency end of things, possibly medium wave band stations. Funny 
thing is I get no ADC warning in KK but as soon as I switch to PowerSDR 
I get the flashing red yellow warning, also, although the peak down at 
the low-frequency end is large, it doesn't appear to come within the 
range which would cause an ADC warning.

Jeff Cook, G0AFQ.
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