P300H
P300 Series Modem Installation and Operating Handbook
Page 157
DAC output , value = 4 in Appendix E starting on page 207)
In
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mode the Target Eb/No has to be set as well as a
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Only when
the target Eb/No tolerance is exceeded is the Tx power adjusted to bring the distant Eb/No back to
the target value. The Tx power will only continue to be adjusted automatically until the Eb/No settles
on the target value. This prevents continual Tx power variations under normal minor thermal noise
ariations. Once settled on the target Eb/No the Tx power adjustment will only be automatically
et along with a slew rate limit (if it is felt that additional
limits one of three sc
+/- Limits
:
red to maintain the Eb/No.
+ Limit only
:
v
reactivated when the Eb/No tolerance is again exceeded.
Separate upper and lower Tx power limits are s
limits to prevent rapid power variations are required). By manipulating the upper and lower power
enarios can be achieved:
Constant performance
: Always uses the power requi
Provided the limits are not reached the link performance will stay as it is (subject
to the tolerance window).
Best performance
: The power will increase when required by a fade bit it will not
reduce. Any especially good atmospheric conditions will improve the Eb/No
