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P300H P300 Series Modem Installation and Operating Handbook Page 115
Tune Reference:[50]% to nudge
YES to accept, NO to cancel
Change, BUC/LNB, Tune Ref Menu
6.12.11 Change, BUC/LNB, Tune Ref Menu
This screen is only shown if a tuneable internal reference is fitted (ie something other than the default 1PPM
reference).
This screen allows the internal reference oscillator to be calibrated up to about +/- 1PPM (the actual range
depends on the exact oscillator option chosen) to compensate for ageing of the quartz crystal.
To calibrate the internal oscillator, either monitor the 10MHz reference if set to be output up the coax, OR,
(OFF SATELLITE) set the Tx carrier to the highest possible frequency, engage CW (Carrier Wave) from
the test menu, and measure the carrier centre frequency itself.
Needless to say. Ensure whatever you are measuring the frequency with is itself calibrated, warmed up,
and significantly exceeds the stability of the reference option fitted to the modem (viewable under Info, This
Unit)