I have a continuous duty power amplifier (TLD2602A) from a Motorola MSR 2000 that I would like to test by itself (not installed in the MSR chassis). The plan was to put it on a dummy load, use a HT on low power as an exciter and power it off of a 13.8vdc supply. What I can't quite figure out is how to key the amplifier. The 4-wire plug on the unit that goes to the exciter has four wires:
Pin 10 wire labeled TX SW 9.3,
Pin 3 labeled GND,
Pin 15 labeled Control Voltage (which I believe is an ALC line running TO the exciter)
Pin 4 labeled Key A- or Keyed A- depending on what schematic you look at.
I was thinking that supplying +9.3vdc between Pin 10 and Pin 3 might command the amp into transmit but I'm not sure what Pin 4 is doing.
tnx
N3AE