SW Version 2.04
30-January-2009
Page 58 of 128
After the decoder has performed the calibration described above it is possible to fine-
tune the power level through the
Fine Level Adjust
parameter. The slider makes it
possible to adjust the power level ±1dB. Fine level adjustment should only be used in
conjunction with an external power measurement (for example a power meter). The
following steps should be used to fine calibrate power:
Select
RF Power Level
and
RF frequency
and click the
Change
button. This will
configure the decoder and RF calibration will be performed (picture is automatically
turned to black while calibration is being performed). The power accuracy will be ±
1.0 dB. Please note that the unit should be warm to assure accurate power setting.
If accuracy higher than ± 1.0 dB is required, fine level adjustment must be
performed. Before starting fine level adjustment, turn the channel off on the main
input page. Turning the channel off will provide a black picture.
Click the checkbox next to the
Fine Level Adjust
slider-bar. Adjust the power setting
using external power measurements and click the
Apply
button. The fine level adjust
setting will not be activated before clicking the
Apply
button. Please also note that
fine level adjustment should only be performed when the unit is at operational
temperature (allow 15-30 minutes operation before performing fine calibration).
When the fine level adjustment has been completed, turn back on the service from
the main input page.
When the fine level adjustment has been enabled, the automatic calibration is turned
off since this only have an accuracy of ± 1.0 dB. All power calibration settings are
stored in the flash. At a power recycle, these power calibration settings are recovered.
When the unit comes back to the operational temperature, the power accuracy is
within ± 0.25 dB assuming same operational temperature.
Since the fine calibration is only valid for the selected frequency, frequency selection
and course power setting is disabled when fine level adjustment has been selected. To
change frequency or course power level, please deselect the
Fine Level Adjustment
box and adjust the settings as required. A new automatic calibration will be performed
when the frequency or the course power level settings are changed.
4.5.4.2
Additional RF Parameters
There are some other RF parameters that are placed on a hidden WEB page. These
parameters, which are not applicable for the HP RF Decoder modules, are configured
in production and shall not be changed. The parameters are found on the hidden
Decoder Configuration page at address: <ip-address>/cgi-bin/rf-setup.cgi.
Preset Filters
The Filter setting should be set to match the physical filter.
AVCR
Audio /Video Carrier Ratio
VMDept
Video Modulation Depth
4.5.5
RF and NICAM Parameter Configuration
For Decoder modules with NICAM the configuration page will display a Nicam section
as in
Error! Reference source not found.
.
The following configuration parameters are available. Please refer to ETSI standard
EN300163 v.1.2.1 before changing the default configuration for NICAM:
