[Elecraft] External linear amplifier with CW

[Vic Rosenthal]

Joe - aa4nn wrote:

> Hi 'crafters,
> 
> I perused the archives and found a little bit of information on the K2 having
> a high voltage keying transistor for keying an external amplifier.  Use of 8R
> Hold for delay times?  I need more help on how to do this for operating in CW
> only.
> 
> I am accustomed to linears having key-in, key-out for QSK.  This Tokyo
> Hy-Power amp has a fast t/r relay to put the amp into transmit mode,
> equivalent to PTT where I have used a foot switch to transmit.  While a foot
> switch isn't bad, I'd rather use the K2 keying transistor to trigger the amp.
> Am I on the right track?  Any ideas?

You shouldn't have any trouble using the keying output of the k2/100, which is 
based on the 8r line.  There is sufficient lead time to safely key QSK amps (I 
forget how much, but maybe 15 msec? -- someone who knows, please jump in).  I 
have used it with homebrew vacuum relay QSK systems as well as an Alpha with PIN 
diode switching.  You should not need the key-in/out setup.

-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco