[Elecraft] P3 birdies in display

[n6wg at comcast.net]

Hi Peter 

Yes, I too have the "marching noise peaks", but mine go away when I disconnect the antenna from my K3. 

My problem is the pips that look just like a signal but move across the screen at a either the same pace 

as the cursor, or at some multiple of its pace.  I remember Eric saying that these are harmonics from 

internal oscillators in the K3. 

I'm wondering if anyone has tackled the problem of reducing or eliminating these "birdies". 

thanks for the reply and Merry Christmas, Peter. 

73, Bob N6WG 

The Little Station with Attitude 





----- Original Message -----


From: "Peter Torry" <peter_torry at btopenworld.com> 
To: Elecraft at mailman.qth.net 
Sent: Monday, December 19, 2011 9:53:48 AM 
Subject: Re: [Elecraft] P3 birdies in display 

Hi Bob, 


I 
too have had noise peaks pass from left to right across the screen of 
the 
P3 leaving a diagonal waterfall trace.  First a small one, then one at 
+40 dB above the reference level then another small 
one, all moving slowly across the screen. Nothing is heard on the K3 and occurs even when the P3 is disconnected from the K3 and is therefore 
internally generated.   
I cured the noise 
peaks by ensuring all the case connections were clean, the fixing screws reasonably tight and re 
installed all of the ribbon and coax connectors in the P3.  The screws holding the 
display to the front panel made the most difference as I was careful not 
 to over tighten them originally !! 

 I also have re radiation of 19kHz noise on 2m that still comes and 
goes even though I have filtered the supply lead.  


73 

Peter 
G3SMT 



________________________________ 
 From: "n6wg at comcast.net" <n6wg at comcast.net> 
To: elecraft at mailman.qth.net 
Sent: Saturday, 17 December 2011, 17:13 
Subject: [Elecraft] P3 birdies in display 
  


I’ve dug through the archives looking for info on fixing this. 



So far no luck.   I understand the birdies I’m seeing are harmonics from 



oscillators within the K3.   Has anyone done any experiments in the K3 to 



reduce these birdies?   Maybe moving cables, or adding ground 



straps somewhere? 



Thanks and 73 



Bob N6WG 



The Little Station with Attitude 


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