P3 birdies in display

[n6wg]

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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[Peter Torry]

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: "[hidden email]" <[hidden email]>
To: [hidden email]
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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[n6wg]

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" <[hidden email]>
To: [hidden email]
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: "[hidden email]" <[hidden email]>
To: [hidden email]
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


______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft 
Help: http://mailman.qth.net/mmfaq.htm 
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net 
Please help support this email list: http://www.qsl.net/donate.html 
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft 
Help: http://mailman.qth.net/mmfaq.htm 
Post: mailto:[hidden email]

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Please help support this email list: http://www.qsl.net/donate.html
______________________________________________________________
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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html