[Elecraft] SPE Expert 1K-FA Amplifer and K2 and K3

[Phil & Debbie Salas]

The SPE amp will respond to the K3 Band Data output exactly as the Yaesu 
Band Data Output.  The only issue is that the K3 uses open drain outputs.  I 
don't believe that the SPE amp has pull-up resistors on the Band Data 
inputs, so you may need to put 4.7K pull up resistors to 5V on the K3 band 
data outputs.  But you can put a voltmeter on one of the SPE band data 
inputs and see if it reads 5VDC.  If it does, then you are all set.

Remember that the SPE amp puts out full power with about 20 watts of drive, 
so adjust your K3 drive power accordingly (no ALC interface for the K3 yet).

Phil - AD5X