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CDM 1250/1550 squelch adjustment

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Mar 24, 2017

I have a LB CDM1550 radio that has its squelch set too tight. The squelch breaks at ~-111dBm or .63uV. I need to readjust the radio so squelch opens at ~-120dBm or .21uV.

Using a comms tester I read the radio using Moto's Tuner app (admittedly I have only used CPS in the past and have no experience using Tuner) and tried adjusting the radio's squelch levels. But no matter what adjustments are made the squelch never seems to change.

I first tried using the "auto adjuster" which made moderate tweaks to each of the 7 frequncies. But that made little-to-no difference. So I then tried making manual adjustments, and after several tries, I then began to make some extreme changes with the sliders, going to both extremes (low and high). But still the squelch threshold just does not adjust.

So I am wondering what I am likely doing wrong? After I hit the Program button (lower left of squelch adjust screen, and I close the window the radio resets and after I read it again and check, the squelch settings do seem to have been saved.

I wonder if anyone might have some friendly advice or a suggestion or two pointing out what I must surely be doing wrong here?

Thanks in advance.
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