Appendix C. -Frequency Offset Adjustment For Tuning; Analogue And Digital Channels - Promax 26 Manual De Instrucciones

USER'S MANUAL. PROMAX-26
APPENDIX C.- FREQUENCY

ANALOGUE AND DIGITAL CHANNELS.

It is possible to introduce an offset of the tuning central frequency for the
channels defined in each channel plan using the ∆FCH parameter (± 2.5 MHz).
Therefore, it is possible to adapt the measures to irregular tunings, due to small
displacements on channel central frequencies that are defined by the standard channel
plan.
Figure 41.- Frequency offset on the tuning central frequency.
Taking as example the previous figure, if we suppose that in the configuration
parameters of the digital channel (CH-33) a frequency offset equals to 1 MHz has been
defined for the channel tuning frequency (∆FCH = -1MHz), although the central
frequency corresponding to channel 30 (569 MHz) does not match with the defined one
for the current CCIR channel plan (CH-33, 570 MHz), it will be possible to take
measures corresponding to the Docsis normative for the standard FCC channel plan
(CH-30, 569 MHz) with no need to modify the current channel plan or to enter a new
one.
02/2007
OFFSET ADJUSTMENT FOR TUNING
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