[Elecraft] Question about K2 mod for optimizing it for 5W CW

[Alexey Kats]

Sorry, I managed to press the wrong key and sent it before I finished it.

Anyway... I know that older version of K2 manual refers to changing
winding of T4 transformer to 2:2 (instead of original 2:3) in order to
increase efficiency of CW performance on 5W or less. Is it still
applicable to the current version of K2? I am not interested in SSB
mode at all, so limiting max power to 5W is acceptable. I simply want
to know whether the rest of tuning instructions will be the same if I
change T4 winding according to those directions from rev C manual?
(25-30% decrease in current drain is quite important when operating
from batteries.) In any case, I am going to add 6.8k resistor to the
R2 (of course it depends on the total resistance of R2 in the current
kit) on control board according to DK3RED mod (which will limit max
power to about 5W anyway), and I want to limit current consumption as
well if I can.

I went through the schematics in manuals from revision C, D and G, and
as far as I can see nothing indicates that this T4 transformer
operation had changed (since it is operating in exactly same output
stage as the older versions of K2 PA), so I am assuming it is safe to
change its winding. But if I am wrong, please, tell me so.

Thank you.

On Mon, May 31, 2010 at 5:56 AM, Alexey Kats <alexeykats at gmail.com> wrote:
> I have one more question about K2. I noticed that revision C of K2
> manual says that if to increase QRP   T4 transfor
>
> --
> Alexey Kats (neko)
>



-- 
Alexey Kats (neko)