Holben SINAGA wrote: > We have this annoying problem where the receiver squelch opens up on > the Quantars and is retransmitted. It can happen to each repeater > individually, or both can fire up at the same time. Generally, only > white noise can be heard.
> The interesting thing is that both repeaters have ctcss enabled, so in > theory, the receivers should not open the gate without the correct > tones. Do you transmit a CTCSS tone as well as receive one? What happens if you turn the transmitter off while the problem is happening, does the squelch close? If it does, your transmitter is either mixing with another and you're hearing your own CTCSS tone, or your system is exhibiting desense and you need to fix the duplexer/transmitter to receiver isolation problem. > I have slowly increased the squelch threshold, which is now > sitting at around 20%. This has had some success in that the receiver > can open with the white noise up on the Quantar, but the threshold is no > reached to open the gate and fire up the transmitter I can continue to > experiment with the squelch gate threshold by setting it to to higher > levels, but I do not want to continue and impeede on the radio range > performance. This is not the correct way to set a squelch on a repeater system. Squelch should be set to a specific receiver input signal level and than left alone. Anything opening that squelch from that point on is ABOVE that signal level, which you know because you've set it properly. Then you investigate to find out what it is. Nate WY0X
