At 12/14/2007 17:56, you wrote: >Bob, I have four repeaters in service using a Zetron >38A controller, and had the following experience. > >When I enabled the courtesy tone at the end of a >transmission a station that was on the edge and >'picket fencing' would be unreadable for all the beeps >the controller would insert. It seems the Zetron >would insert the beep for any drop in the CAS line. I >had to disable the courtesy tone on all the repeaters.
I don't/wouldn't use a controller that didn't have any courtesy tone delay. >When I did the squelch board mod, this problem went >away. I was able to put the courtesy tone back in on >all the repeaters as I modified the SAS boards with >the new capacitor values and no extraneous beeps >occured with a 'picket fencing' signal. It seems that >the quick cycling of the CAS line was triggering off >the beeps even though the CAS came right back up, but >the Zetron was committed to outputing the beep, and >destroying the intelligability of the station >transmitting. > >I think the problem you have experienced when using >RUS in place of CAS would go away if you had also >implemented the SAS mod recommended on the RB site. I don't see how increasing the value of a capacitor would reduce the squelch attack time. OTOH it may increase the fast squelch release time, which would be very undesirable IMO. If I get some time I'll try the mod. & measure the length of the FQ squelch tail before & after the capacitor change. Bob NO6B
