[Motorola] YLN4608A

[Glenn Little WB4UIV]

Does anyone have hookup info on this amplifier / switchbox? This appears to 
be from ambulance or fire service where it was possibly used for the rear 
interface to the radio for transmit and receive audio. The controls mounted 
on the front are: Speaker on/off and vol, Monitor on/off and hand set vol. 
Also has transmit light. The microphone connector is the same as use on the 
MOTRAC. Inside it has a 10 pin dual row header type connector and a two pin 
molex type connector. It has a 5 pin heatsunk ic, probably an audio amp, a 
relay, probably to switch audio and other small parts. This ia all mounted 
in a gasketed diecast box.

Any help appreciated.

73
Glenn
WB4UIV