Bob Korves wrote:

Undoubtedly, your club has a member that can assist you, if needed.



You could also use a DPDT PTT switch on the stick to control both
functions.

This would work fine. In my glider, changing the switch and running the
extra wire would be more trouble than the relay, but it might be an
easier choice for Mr. Lepp.

A SPST PTT switch with both NO and NC contacts

That would make it a SPDT switch. It probably is one, already, but
another wire might be needed.

would probably
do the job, too. This would eliminate the relay and diode and the extra
complication and current draw, reducing potential failure points at the
expense of routing more wires to the PTT. KISS. :-)

This method would work fine if your vario uses a grounded speaker. Some
require a "floating" speaker, like the Cambridge 302.


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Eric Greenwell
Washington State
USA