We use downhill signaling for our .88 repeater for Echolink in Spokane. I installed a simple (NPN) switch on the CG encoder since it already has that feature (CG disable).
Works great using a control station. Also works with IRLP (in a past project).
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Regards, Karl Shoemaker
To contact me, please visit SRG's web site at?
for the current email address.
Karl Shoemaker