[Elecraft] CW PTT

[Bill Coleman]

On Aug 24, 2005, at 8:49 AM, W3FPR - Don Wilhelm wrote:

> The K2 produces RF about 15 to 20 ms after the KPA100 Amp Keying  
> output goes
> low, so if an amplifier can be ready to accept RF input properly  
> within that
> time period, it is fast enough to follow the K2.

Great. I just bought an AL-80A from an estate sale and was wondering  
if the K2 would be hot-switching. The specs indicate a 15 ms relay  
changeover time, so that should work great with the K2.

There are only two issues with the K2/100 and the amplifier: 1) the T- 
R timing ought to change when using the amp, since it can't do QSK.  
2) the K2/100 power output seems to "dither" by about 5-9 watts  
depending on the power setting. This makes it very hard to tune the  
amp, since the K2 power output jumps around so much.

I realise there's a fix for the latter, by increasing the value of a  
270 ohm resistor in the ALC chain.

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