Adjustment of L34 on a K2

[W0YG, Charlie Summers]

On a K2, how critical is the adjustment of L34?  This is an adjustment that
peaks the IF amplifier.  The manual states a peak should be found one turn
of the slug down from the top however mine seams to be peaking right at the
top of the can.  Actually, I cannot go through the peak as it just gets
louder with the slug all the way at the top.

The adjustment in question is on page 64 of the K2 manual, IF Amplifier
Alignment.

I thought I would revisit this after completing alignment as I have done 40M
alignment on that same page as well as done the transmitter alignment.

Just trying to peak and tweak to be sure everything is maxed out!

73,

Charlie, W0YG..>>

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[Manuel Wilches]

Charlie:
I have done this 2 days ago and the same thing happened to me (I am still on
part II).
L34 is on top of the can for the peak signal/noise.
I cannot give you any technical explanation for this but I am sure some of
the guys on the Reflector will.
I will be liestening, that is for sure.
I have my "40 meters only" receiver on since yesterday and I am absolutely
amazed with the receiver.
73
Manuel
LU5OM
CT4IK
# 5310


----- Original Message -----
From: "Charlie, W0YG" <[hidden email]>
To: "Elecraft Reflector" <[hidden email]>
Sent: Sunday, February 26, 2006 11:51 AM
Subject: [Elecraft] Adjustment of L34 on a K2

> On a K2, how critical is the adjustment of L34?  This is an adjustment
> that peaks the IF amplifier.  The manual states a peak should be found one
> turn of the slug down from the top however mine seams to be peaking right
> at the top of the can.  Actually, I cannot go through the peak as it just
> gets louder with the slug all the way at the top.
>
> The adjustment in question is on page 64 of the K2 manual, IF Amplifier
> Alignment.
>
> I thought I would revisit this after completing alignment as I have done
> 40M alignment on that same page as well as done the transmitter alignment.
>
> Just trying to peak and tweak to be sure everything is maxed out!
>
> 73,
>
> Charlie, W0YG..>>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
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> Elecraft web page: http://www.elecraft.com
>
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[Rich Lentz]

Charlie

Here is a technique I used to adjust L34 - While performing the "I.F.
Amplifier Alignment" section of "Alignment and Test Part II," I  used
Spectrogram (just about any program that displays the received signals
should work).  I had meant to put this hint on  the reflector long ago and
keep forgetting.

Follow the instructions for "I.F. Amplifier Alignment."  When you get to the
last step plug the PC sound card into the Speaker Jack (not Headphone as it
attenuates some high frequencies - but it probably don't make that much
difference).  You will notice some noise spread across the spectrum
displayed. Make sure the XFIL is set for FL-1 OP-1.  Now continue to adjust
L34 for a compromise of the lowest displayed noise and the highest level of
the tone (signal).  You will find a point where the noise is almost non
existent.

Even though I had adjusted this to what I thought was the best by "ear,"
after using this method and then re-adjusting the AGC threshold,  I was
amazed at the difference in sensitivity and audio level (I think the noise
de-senses the AGC - perhaps the experts can explain this).  Maybe this is
one of the problems/reasons some people complain about "low output volume."

Rich,
KE0X

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Charlie, W0YG
Sent: Sunday, February 26, 2006 8:52 AM
To: Elecraft Reflector
Subject: [Elecraft] Adjustment of L34 on a K2


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[Nigel A. Gunn G8IFF/KC8NHF]

And if you wind the slug out a bit further?
It's not normally necessary to stop winding just because the slug is
level with the top of the can.
Or possibly you've got a too high value capacitor across the coil?



Charlie, W0YG wrote:

>  Actually, I cannot go through the peak as it just gets louder with
> the slug all the way at the top.


--
<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
Nigel A. Gunn. 59 Beadlemead, Milton Keynes, MK6 4HF, England.
Tel [phone]       mobile [phone]
e-mail [hidden email]             www  http://www.ngunn.net 
Amateur radio stations  G8IFF, KC8NHF
Member of  AMSAT-UK #182, ARRL, GQRP Club, QRPARCI, SOC #548,  RAYNET
           Flying Pig #385, Dayton ARA #2128, AMSAT-NA  LM-1691,  MKARS
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[Rich Lentz]

Charlie

Here is a technique I used to adjust L34 - While performing the "I.F.
Amplifier Alignment" section of "Alignment and Test Part II," I  used
Spectrogram (just about any program that displays the received signals
should work).  I had meant to put this hint on  the reflector long ago and
keep forgetting.

Follow the instructions for "I.F. Amplifier Alignment."  When you get to the
last step plug the PC sound card into the Speaker Jack (not Headphone as it
attenuates some high frequencies - but it probably don't make that much
difference).  You will notice some noise spread across the spectrum
displayed. Make sure the XFIL is set for FL-1 OP-1.  Now continue to adjust
L34 for a compromise of the lowest displayed noise and the highest level of
the tone (signal).  You will find a point where the noise is almost non
existent.

Even though I had adjusted this to what I thought was the best by "ear,"
after using this method and then re-adjusting the AGC threshold,  I was
amazed at the difference in sensitivity and audio level (I think the noise
de-senses the AGC - perhaps the experts can explain this).  Maybe this is
one of the problems/reasons some people complain about "low output volume."

Rich,
KE0X

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Charlie, W0YG
Sent: Sunday, February 26, 2006 8:52 AM
To: Elecraft Reflector
Subject: [Elecraft] Adjustment of L34 on a K2



--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.375 / Virus Database: 268.1.0/269 - Release Date: 2/24/2006
 

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[William D. Rugg, Jr.]

 Hi,

I'm looking to purchase a K1-4 Four-Band 5W CW Xcvr with the KAT1 Internal
ATU for the K1 installed.

Should you have one that is excess for your needs, I promise to give it a
good home, raise it properly, and take it to all the best QRP places!

Thanks for the use of the bandwidth,

Bill K2RXQ


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