PPM Adjustment

[David Leiken]

Once you manually adjust your PPM should you uncheck the auto PPM, or leave it checked on? This question is for monitoring a P25 LSM trunked system using 0.6.1 Final. 

[charley....@gmail.com]

I cannot vouch for this being the correct procedure, but I uncheck the auto PPM box and adjust the ppm manually to the best value I can get (almost always 0.0).  After the sdr warms up / stabilizes, I make any final adjustment if necessary, then check the auto ppm box.  Theoretically this allows the software to make any fine adjustments if they become necessary.

[Mike Johnston]

I would think you would want to leave it on. Your error will drift a little back and forth throughout the day and seasons as the temperature increases and decrease.

On Mon, Mar 23, 2026, 07:26 David Leiken <david...@gmail.com> wrote:

Once you manually adjust your PPM should you uncheck the auto PPM, or leave it checked on? This question is for monitoring a P25 LSM trunked system using 0.6.1 Final. 

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