Re: Another KPA500 question

Posted by Jim Brown-10 on Dec 29, 2011; 6:58am
URL: http://elecraft.85.s1.nabble.com/Another-KPA500-question-tp7134629p7134980.html

On 12/28/2011 6:07 PM, bob finger wrote:
> The point being I don't want to have to physically reconfigure the
> cabling etc. when I want to use the big amp.

What you can safely do with the PTT line will depend on the other amp
that you're keying.  I'm doing what you want to do -- Ant1 feeds my Ten
Tec Titan, Ant2 feeds my KPA500, PTT drives both in parallel.  The Titan
can put 28VDC through 10K ohms onto its PTT input in key up. When I had
a beta unit for a while I added a diode in series with the PTT input to
the K3, but as I understand it , the production unit has that diode
built in, and I no longer use it outboard.

So -- all I have to do to switch between the two amps is to choose Ant1
or Ant 2, switch the antennas between the two amps, and reset the drive
level (the KPA wants about 30 watts, the Titan wants 45-50 watts).
Because my station and antenna farm are in a continual state of being
upgraded, I haven't gotten to the point of automating much of it.

73, Jim K9YC


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