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P300H P300 Series Modem Installation and Operating Handbook Page 74
Set AUPC max negative delta power
[1.0dB] (0-25.0dB) ??.?dB (Yes)
Change, Tx, Modulator, AUPC, Min Menu
Set maximum power slew rate: [10]dB/min
(0.1-99.9dB/min, 0=no limit) ??.? (YES)
Change, Tx, Modulator, AUPC, Slew Rate Menu
Set target Eb/No to maintain: [8.5]dB
(0 to 25.0dB) ??.?dB (Yes)
Change, Tx, Modulator, AUPC, Target Eb/No Menu
Set Eb/No tolerance before AUPC action:
[±0.5dB] (0.1-25.0dB) ±??.?dB (Yes)
Change, Tx, Modulator, AUPC, Tolerance Menu
6.6.20 Change, Tx, Modulator, AUPC, MIN Menu
This allows the minimum delta power that the AUPC can use to maintain the distant Eb/No to be set.
Normally the maximum delta power It is set to give the distant Eb/No a boost in poor atmospheric
conditions, with any improvements in Eb/No caused by particularly good atmospheric conditions being
considered a bonus. It is it not normally necessary to set the minimum delta power to any figure other than
zero otherwise any beneficial gain in Eb/No caused by good atmospheric conditions will be negated by a
decrease in Tx power.
This facility only exists so, if as a condition of being able to use AUPC, the satellite operator has asked you
to provide a reduced power in particularly good atmospheric conditions at your geographic location. This
may be in an attempt to `balance out` any increase in power required for other locations where there may
be poor atmospheric conditions, with the AUPC in those locations requiring additional power from the
satellite.
6.6.21 Change, Tx, Modulator, AUPC, SLEW RATE Menu
This facility allows the changes in Tx power to occur at a controlled slew rate to prevent step changes in
Tx power at the IF output. A value of zero indicates no limit and step power changes will occur. Whatever
the slew rate limit the power changes will remain within the Max and Min power limits set on the previous
two screens. Use caution when setting this parameter so that the slew rate you impose It is not too great
to prevent the AUPC system responding to rapid fades (eg 10dB fade in 10 seconds).
6.6.22 Change, Tx, Modulator, AUPC, TARGET EB/NO Menu
This screen allows the target Eb/No to be set. This It is the distant Eb/No when the AUPC mode It is set to
Maint' Eb/No, and the local Eb/No when set to Self Mon. This It is the target Eb/No the AUPC will adjust
the Tx power within the Max, Min, and Slew rate limits (once the Eb/No goes outside the Tolerance window
set below) to try and restore this figure.
6.6.23 Change, Tx, Modulator, AUPC, TOLERANCE Menu