[hpsdr] Mercury Spurious Emissions

[Joe Martin K5SO]

Jeremy,

Connecting a spectrum analyzer to the antenna connector on my Mercury  
I can only see the 122.88 MHz clock and multiples of it, down at about  
-65 dBm.

I see no spurious emission at 144.390 MHz here.

The level of the 122.88 MHz signal I see varies somewhat depending  
upon what band you have selected but is usually pretty close to the  
level I mentioned above.

I'll be interested to see if anyone reports seeing anything different.

Joe K5SO

On Sep 9, 2011, at 5:52 PM, Jeremy McDermond wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
> I've been "doing the rounds" of some of the local hamfests with my  
> OpenHPSDR rig over the past couple of weeks and have run into a  
> problem today.  It seems as if Mercury is radiating spurious signals  
> into the antenna connector.  The symptom is showing up on 144.390  
> MHz.  I have tried removing all boards from Atlas besides Mercury  
> and pulling JP7 on the board to turn off the 10MHz clock.  The  
> signal is full-scale on an FM rig located near the receiver.  When  
> the antenna is removed from the BNC connector, the signal is much  
> weaker, but a handheld near the box will still pick up the signal.   
> Since it's happening with the 10MHz clock powered off, I'm assuming  
> it has to be some issue with one of the clocks derived from the  
> 122.88MHz clock.  Not really sure where to start or whether folks  
> have ideas on what could be the issue here.
>
> --
> Jeremy McDermond (NH6Z)
> Xenotropic Systems
> mcdermj at xenotropic.com
>
>
>
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