[Elecraft] K3 and AL-811 amplifier interfacing...

[Todd - k1tm]

The AL-811 manual states that "Relay:  keys amplifier when grounded.  Sources
+12 VDC open 
circuit and supplies 100mA when grounded.  A built-in pulse canceling diode
protects the exciter. "

The K3 is pretty robust "KEY OUT (RCA/Phono) is the amplifier T-R relay
keying output, capable of keying up to +200VDC @ 5A."  The relay coils back
emf is contained by the diode across it. 

So, no issues switching the AL-811.  5A's and 200Vdc withstand voltage,
beats 100ma and an applied 12Vdc source all day long.

73



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