[Elecraft] External linear amplifier with CW

2004-11-12 Thread Joe - aa4nn
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?
 
73, de Joe - aa4nn
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Re: [Elecraft] External linear amplifier with CW

2004-11-12 Thread 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

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Re: [Elecraft] External linear amplifier with CW

2004-11-12 Thread Joe - aa4nn
Thanks for the tips.  The K2 PA Keyout line to the Tokyo Hy-Power Send 
input works perfectly for putting the linear amp into transmit mode.  I set 
the T-R delay to .75 for a good delay time when sending slow code.

Thanks for all the replies.
73, Joe, aa4nn

K2VCO Wrote:
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.



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Re: [Elecraft] External linear amplifier with CW

2004-11-12 Thread Fred Jensen
I have the circuit from the Elecraft web site.  Unfortunately, my SB-220
won't really do QSK.  Any ideas on how to modify the little perf board
interface to put some (hopefully adjustable) delay in the release to
simulate semi-QSK with VOX for the amp?

73,

Fred K6DGW
Auburn CA CM98lw

Vic Rosenthal wrote:
 
 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

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