JEAN-FRANCOIS MENARD wrote:
I finally did a first prototype of an interface to link two K2/KPA100
on one multi-band HF antenna using Don W3FPR schematic. For my first
"from scratch" project, it is not too bad.
<snip>
Take a look... http://homepage.mac.com/jfmenard/PhotoAlbum55.html
The only thing that bothers me about this circuit is that if the Amp Key
output from either K2 is disconnected for any reason, transmitting on
the other one will put RF into the front end of the first one.
I thought of several ways to make the circuit fail-safe with a few logic
gates, but I'll leave it to the real circuit designers to suggest the
best way. I would suggest using the 8r signals from the K2s in addition
to the amp-key output. The 8r is on in receive mode, and you could
arrange things so that unless either an 8r signal or amp-key ground is
present, that K2 will always be connected to the dummy load.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
_______________________________________________
Elecraft mailing list
Post to: [email protected]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
