Batboard

Our 2-meter Micor repeater is equipped with an aftermarket controller (SCOMM 7K). The controller has an audio delay module installed to mute DTMF tones and prevent squelch crashing.

Could we be effectively cutting receiver range by using the audio delay feature? That is, could very noisy signals be inadvertantly blocked by the audio circuit?

Not unless you are having a problem with the ADM itself. I have one of my repeater controllers(CAT 200B) configured with them and it works great. ADM's only effect AF delay and have no effect on RF received signals as they are mounted and configured in the controllers themselves. If you are having and ADM problem and need to replace one a good source is Arcomm.

http://www.ah6le.net/arcom/

....dan n2aym

If the delay line is a A/D-D/A converter you might check the level of the noisy signal. Some devices that use an analog to digital converter will quit passing audio if over-driven. Noisy signals are often over-driven compared to clean audio.

OK - I was assuming that a level check had been done by the time a question like that was asked but would have to agree with psapengineer's post above.
If you dont have the means(oscope) to do a proper audio level check then try backing slightly off of the 7K's RX audio level on the effected port and do audio tests while this noisey signal RX condition is occuring...dan n2aym