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Date: Mon, 06 Nov 2000 10:49:01 -0800
From: Logan Zintsmaster <lrahnz at garlic.com>
Subject: Re: [Elecraft] Odd SSB power output on 10M

Rich,
I had a similar question about 10M operation.  I found the following app note
very helpful.

http://www.elecraft.com/Apps/T2_winding.htm

It brought my power output up to comparable levels.  I used 1/16" double sided
foam tape to mount T2 in a raised position as suggested in the app note.

Logan, KZ6O
# 1609

mulveyr at iname.com wrote:

> Hi All:
>
>    I've just noticed something odd with my K2 when using PSK on 10M:
>
>    Using the K2's "Tune" function, I get about 5 watts out on 80-15M,
> when the power control is set to 5.  I get about 4 watts on 12M/10M.
> When I use my PSK software's Tune function, I measure abt. 3 watts
> on my WM-1 ( Yeah, I know - not PEP. :-) on 80-15M, but less than
> 1 watt on 12M/10M, for the exact same input level.
>
>   Any ideas as to why I'm seeing such a substantial drop in
> power output on 12/10M?  It seems to me that I should see approximately the
> same relative output using the K2 tune function as the PSK tune function...
>
> - Rich
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Date: Mon, 26 Mar 2001 09:05:59 +0100
From: bejones at hursley.ibm.com
Subject: [Elecraft] Improved 10m output

Playing around looking for new countries in the contest this 
weekend I noticed that 10m SSB wasn't lighting all the power 
lights. Investigating if found my power supply was down at 12.1v  
and max output was just under 9W on 10m (but 10w+ on 15 and 
20m). Played around with the T2 transformer, just 
spreading/compressing the windings without desoldering it. Found 
that it makes quite a difference to 10m output and got just in 
excess of 10W out for the 12V and more on a 13.8v PSU (difficult 
to tell as I was using a Hansen 1W/10W QRP power meter). That's 
getting on for 15% improvement just be ensuring the primary was 
well spread and, particularly, that the green secondary winding was 
as spread widely over the primary.

Also solved another problem. Been having low (1.5W) output on 
160m but never bothered because I don't use this band. Discovered 
I'd forgotten to trim the leads from one of the coils and they had 
bent back touching each other and shorting. I suppose it proves I 
tin them well :-). Getting about 5.5W out on my meter but since it's 
not calibrated below 3.5 Mhz I may well be getting much more - 
must find a better meter.

Bagged another 9 DXCC in the contest including ZD8 and OA 

Brian G0UKB
K2 #1115


Brian E Jones
Centre for Java Technology
IBM HURSLEY
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