Scanner Squelch Differences

[N7CAS]

Recently I brought my old Realistic PRO-2006 back to life (best scanner ever!) and set it up to scan in tandem with a Uniden BCD536HP (duplicate frequencies, different scan rates). My question is this: on the 2006, a particular analog service's signal has its characteristic squelch tail, yet on the 536 it has none whatsoever. Why is that?

 

[millrad]

At the risk of being called Captain Obvious, maybe the squelch threshold settings are different on the two scanners, resulting in a much faster closing time on one of them?

 

[krokus]

Do you have the CTCSS setup for that freq, on the 536? The tone could turn off, before the RF drops.

Sent via Tapatalk

 

[wtp]

hystersis

something about different states.if set close to the open state it takes a higher state to close it, some would call it loose squelch. so try setting it a little higher.Bill Cheek had a fix for it in scanner modification handbook 2. cut a trace at an ic and add a 200k pot and adjust around 120k ohms to tighten the squelch.

 

[sparklehorse]

Do you have the CTCSS setup for that freq, on the 536? The tone could turn off, before the RF drops.

What he said.

I don't think the 2006 supported CTCSS or DCS tones, did it? So you'll have a squelch tail at the end of every transmission on your old rig. On my 536 I have tones entered for all the conventional frequencies I have tones for, which is roughly 3/4 of them. I'd say on half of those there is never a squelch tail due to the tone dropping prior to the carrier, which just depends on how the techs have the repeater set up. That's a nice benefit of CTCSS, it perplexes me when I see people here advise others to never use tones in their scanners. By the way the 536 is the best radio I have as far as squelching the squelch tails. Maybe the 2006 isn't the best scanner ever after all?

.

 

[typesix]

No, the 2006 does not support tones, but it also has a very short squelch tail, shorter than Unidens of the day. In general for scanners of that time, GRE scanners had short squelch tails, while Unidens were all over the place, but with most having a noticeably long squelch tail.

 

[mikewazowski]

Thread moved to GRE forum.