[Elecraft] Re: K2 output power and external amps.

[Bill Coleman]

On Aug 31, 2005, at 10:11 AM, john.brewer at us.schneider-electric.com  
wrote:

> See this tech tip:
>
> http://www.elecraft.com/Apps/Power_Control_Mod.html
> I put a trimpot on mine, to temporarily seek the right value  
> (replaced with fixed resistor
> after experimentation)  and I ended up with something like 680 ohms  
> as I recall.

Yes, I dispensed with the trimpot and went directly to 1 K for R98.  
This has made the shifts considerably smaller, but they are still  
bothersome.

I'm going to try a larger value, such as 1.5 or 2 k next time I have  
the K2 apart. I made need to make some changes to T1 and T2 in order  
to avoid decreasing the overall TX gain.

Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at arrl.net
Quote: "Not within a thousand years will man ever fly!"
             -- Wilbur Wright, 1901