"Michael Black" wrote
Radioman390 ) writes:
While doing some memory scanning of military frequencies tonight, I
was reminded how much I'd like to be able to optimize the squelch
setting for each channel individually.

Some HF radios offer "syllabic squelch" which is not a response to ANY
signal,
but looks only for specific characteristics of voice (syllables)

Harris 505 has this, (but no scanning) as do the Scientic Radio System
units.

Such radios do not respond to noise, so you find that you don't have to
adjust
squelch for day/night differences

I was assuming that was why it's not a common feature. Squelch is by
definition a threshold, and that threshold changes. That doesn't sit well
with something preprogrammed.

Michael


In a scan-set of utility frequencies, there are daytime freqs and night time
freqs. In between, is a transitional area. A preprogrammed day-set could
include from 10 mhz - 25 mhz, with the 10 mhz freq attenuated in memory and
the rest of the day-set on pre-amp if desired. Conversely, a night time set
could have 2-8 mhz on pre-amp and 10 mhz attenuated. This way, the squelch
can be set to allow scanning w/o stopping on high background noise from
frequencies in the transitional area.

Jack