[Elecraft] P3 SVGA - Spurious Spike

[Mike K2MK]

Hi Ted,

Do an archive search for the string:

SVGA ribbon cable

Review the posts and see if they bear any similarity to what you are now
experiencing. I think the gist of the thread was that placement of the
ribbon cable could be the cause of spurious spikes. 

73,
Mike K2MK


Dauer, Edward wrote
> Just installed the SVGA option in the P3 and have an odd spike appearing
> on the screen.  Any help would be appreciated.  Here are the symptoms:
> 
> The spike appears at 11.8 KHz above the VFO A frequency, and stays at that
> distance as VFO A is tuned - that is, it moves as VFO A moves.  It appears
> on 10, 15, 20, and 40 meters (haven¹t tried others).  The apparent
> amplitude is over S9.
> 
> But there is no signal there - tuning across the spike¹s frequency with
> the SubRX produces nothing audible in the K3.
> 
> The spike disappears when SVGA EN is set to OFF.
> 
> The spook appears although there is no SVGA monitor connected, and no
> computer connected to anything, so it¹s not from some other box.  Seems to
> be residing in the P3.  Did not occur before the SVGA option was
> installed.
> 
> Firmware in both the K3 and the P3 and its SVGA are current as of
> yesterday - but the anomaly appeared both before and after the updates,
> and before and after the synths were changed.
> 
> Any ideas or suggestions?  Thanks!
> 
> Ted, KN1CBR





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