K2 IF Alignment question

[Guy Hamblen]

Happy Turkey Day to all,

Symptom:  In aligning the IF Amp on K2 #5091, I am not hearing any signal
strength variation when adjusting L34 per the instructions on pg. 62.  The
weak signal near 7000 khz is relatively loud but moving the slug doesn't
result in any variation that I can hear.  I can peak signals with L1 and L2
for the 40m bandpass alignment.  And actual band signals seem the same
signal strength when compared to an ICom 746.  All resistance test readings
and all other alignment tests are within range.

Is there normally much signal variation when aligning the IF amp?  If so,
please point me in a direction for troubleshooting.

Thanks in advance,

Guy N7UN/2

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[Jim Younce]

Symptom:  In aligning the IF Amp on K2 #5091, I am not hearing any signal
strength variation when adjusting L34 per the instructions on pg. 62.  The
weak signal near 7000 khz is relatively loud but moving the slug doesn't
result in any variation that I can hear.  I can peak signals with L1 and L2
for the 40m bandpass alignment.  And actual band signals seem the same
signal strength when compared to an ICom 746.  All resistance test readings
and all other alignment tests are within range.

Guy:

I have built fourteen K2s and have never really seen a significant peak in
the adjustment of L34.  The true peak has to be observed by using an ac
voltmeter connected to the audio output.  Most of them peak about a half a
turn in from the top.

73
Jim K4ZM


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[Vic K2VCO]

[hidden email] wrote:
> Happy Turkey Day to all,
>
> Symptom:  In aligning the IF Amp on K2 #5091, I am not hearing any signal
> strength variation when adjusting L34 per the instructions on pg. 62.  The
> weak signal near 7000 khz is relatively loud but moving the slug doesn't
> result in any variation that I can hear.  

There is very little variation when adjusting L34, but you should notice
it.  The peak is usually quite close to the top of the slug's travel.

--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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[Ron D'Eau Claire-2]

If you look at the signal on Spectrogram or something similar, you'll see
there is a different in the signal-to-noise ratio as you adjust L34 as well.
The best S/N seems to coincide with the very broad peak, however.

I've most often described that peak as "subtle".

Ron AC7AC

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Vic K2VCO
Sent: Thursday, November 24, 2005 9:14 AM
To: [hidden email]
Cc: [hidden email]
Subject: Re: [Elecraft] K2 IF Alignment question


[hidden email] wrote:
> Happy Turkey Day to all,
>
> Symptom:  In aligning the IF Amp on K2 #5091, I am not hearing any
> signal strength variation when adjusting L34 per the instructions on
> pg. 62.  The weak signal near 7000 khz is relatively loud but moving
> the slug doesn't result in any variation that I can hear.

There is very little variation when adjusting L34, but you should notice
it.  The peak is usually quite close to the top of the slug's travel.

--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco _______________________________________________
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Post to: [hidden email]
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