Concept:
From the factory, the squelch action of the Hamtronics R Series receivers
have too much hysteresis built in for most peoples' liking. This can
easily be changed by referring to your manual for your specific receiver.
Hysteresis is the amount of change needed in quieting between when the squelch opens to when it closes. From the factory with the squelch set normally, too much quieting is necessary to open the squelch, at least for my liking. I prefer to have the open and shut points closer together. The values stated in this article give about 3 dB of hysteresis, which is more appropriate for repeater service in my opinion.
Modification:
On a R144, R220 or R451 crystal sets, the value of R25 can be
changed up in value to achieve less hysteresis.
In older sets I have had luck with the value of 1 megohm when the original
value of R25 was 330k.
Newer models use a lower resistance for R25 and the value of 3 times
the original can be tried.
Again, The value of R25 can be adjusted to suit your personal needs.
This circuit modification was derived from information from the various manuals by Kevin Custer W3KKC, July 2000.