The M175 Series transmitter is offered in three versions. The standard model is the M175. The M175-LS has an additional audio mute switch on the front panel, and the M175DC has a proprietary Digital Code Squelch* circuit to eliminate squelching problems caused by interference.
The digital code system provides much more reliable control over the receiver audio output than a conventional squelch can provide. The transmitter generates an 8-bit code at turn on, and another code at turn off, to open and close the audio output on the receiver. The squelch on the receiver cannot be opened by anything other than the specific code it is programmed to receive. This type of squelch system is even more important when the receiver is connected into an automatic mixing system.
