K1 Low Power on 20M band once ATU is installed...fixed!

[Elecraft mailing list]

Well it is finally fixed.  When I went to listen to the signal on my  K3 I
noticed the frequency was off around 500 Hz or so.  Tried to adjust  the
sidetone pitch and nothing happened - test mode audio was weak and frequency  
would not change with C13.
 
I moved C13 back and forth a little and the tone came in nice and strong -  
with a adjustable pitch.
 
Re-installed ATU and now a full 5.5 Watts on 20 Meters using a 3 cell Li-Po
 (12.2 Vdc)!
 
Looks like a defective C13 or cold solder joint.
 
The owner of this K1 will be happy when he hears this news!
 
73's Michael
n2zdb
 
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[Don Wilhelm-4]

Michael,

C13 is the Transmit Offset capacitor adjustment.  It is quite possible
that there was a bit of oxidation between the rotor and the fixed plate
which was cleared by rotating the trimmer.

73,
Don W3FPR

On 2/27/2016 11:03 PM, [hidden email] wrote:

> Well it is finally fixed.  When I went to listen to the signal on my
> K3 I noticed the frequency was off around 500 Hz or so.  Tried to
> adjust the sidetone pitch and nothing happened - test mode audio was
> weak and frequency would not change with C13.
> I moved C13 back and forth a little and the tone came in nice and
> strong - with a adjustable pitch.
> Re-installed ATU and now a full 5.5 Watts on 20 Meters using a 3 cell
> Li-Po (12.2 Vdc)!
> Looks like a defective C13 or cold solder joint.
> The owner of this K1 will be happy when he hears this news!
> 73's Michael
> n2zdb

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