Lincoln Squelch

[C2]

I'm not very happy with the squelch performance.

I seems to have a broad range and cuts in/out too much.

If I turn it up enough to squelch the noise, it does not break on a well-received transmission.

 

[Moleculo]

Did you try doing a RX alignment?

The SQL adjustment is:
In AM mode, Sent a 66db 1KHz modulation into the radio, Adjust VR102 so the squelch just breaks.

 

[C2]

Did not do an RX alignment yet.

Is adjusting VR102 basically the same as turning the squelch knob or does it have some other effect, such as adjusting the overall sensitivity.

I was just noticing that the squelch actually works OK when the noise level is around 1S to 2S. Weak signals seem to break the squelch fine. Auto squelch works good here too.

But when the noise is up to 5S, then signals just over this noise level do not break the squelch and they need to get up to about 7S. Auto squelch does not work under these conditions as it just stays open.

Maybe this is just the way it's designed to work?

 

[Moleculo]

To adjust the overall sensitivity, you're going to have to do the complete RX alignment. It almost sounds like the AGC is responding the increased noise floor, which is causing the SQL to not break. Perhaps someone like Rogerbird can comments on if this is normal behavior. I attached a document on the 2510/Lincoln with lots of mods and alignment procedures.

 

[C2]

Thanks a ton, Molecular dude!

As far as I know, the radio is all stock.

 

[C2]

I was playing around with an old Road Talker SSB 40 channel rig.

Nice rig!

The squelch is GREAT! Not only is it very sensitive, the squelch actually slowly decreases the RF as you turn up the squelch. It sounds like you are turning down the RF gain, but the squelch actually still works on signals. So I can turn up the squelch just enough to bring the static down to a faint roar, and both weak signals and local signals fully break in. If I turn it up a bit more, the static can be squelched out, weak signals lightly break in, and local signals fully break in. Or I can turn it up a wee bit more and kill all the weak stuff.