Promax PROPOWER - 5, Руководство пользователя

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USER’S MANUAL. PROPOWER-5
07/2006
Page 33
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APPENDIXES
APPENDIX A.- FREQUENCY OFFSET ADJUSTMENT FOR TUNING
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 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.
Central Freq. Ch UL12 IBER (1.25 Mhz)
Central Freq. Ch DL13 IBER (3.25 Mhz)
Offset= 2 MHz
( FCH=-2 MHz, Ch DL13)
Figure 34.- Frequency offset on the tuning central frequency.
Taking as example the previous figure, if we suppose that in the configuration
parameters of the digital PLC channel (CH DL13) a frequency offset equals to 2 MHz
has been defined for the channel tuning frequency (
∆
FCH = -2 MHz), although the
central frequency corresponding to channel CH UL12 (1.25 MHz) does not match with
the defined one for the current IBER channel plan CH DL13 (3.25 MHz), it will be
possible to take measures corresponding to the standard IBER channel plan (CH UL12,
1.25 MHz) with no need to modify the current channel plan or to enter a new one.