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Davicom FMBM, Reference Manual, March 2015
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14- Power Monitor Calibration
operates in 2 different modes, depending on which RF Input
is selected (Antenna or High Level in Menu step 6). If Antenna input mode was selected,
pressing the MENU button here in Menu step 14, sets a new reference level that is used
by the FMBM as the normal receive signal level. See Menu step 15 for setting the alarm
level that will be x dB below this normal level.
If High-level input mode was selected in Menu item 6, the display shows the voltage that
is output to the rear panel RF Power Monitor output.
This output level is calibrated
through the front-panel potentiometer (RF Power Monitor Adjust.) while injecting a known
level of RF at the High-level input connector.
15-Low Power Limit
sets the number of dB below the Power Monitor Calibration level
(Menu item 14) that will set a low-power alarm. It can be set from -1 to -9 dB for High-
level mode and from -1 to -99 dB for Antenna input mode.
16- Frequency Drift Limit
sets the frequency range beyond which the FMBM will activate
the frequency drift alarm. It can be set to any value between 0.5 kHz to 10 kHz and is
only used on the FM band.
17- Stereo Alarm setting
allows users to enable or disable the stereo presence alarm. This
is useful for stations that normally transmit in Mono mode only. It is used on the FM band
only.
18- RDS Data
turns on the RDS data display mode that shows the {Program Station},
{Program Type} and {Radio Text} data as it is transmitted by the station. It is useable on
the FM band only for stations that do transmit RDS or RDBS data. RDS data is displayed
for a period of approximately 2 minutes and then the display reverts to its default mode.
19- RF Alignment
allows fine tuning of the RF input circuit to optimize signal reception
depending on antenna type and matching. Selecting this Menu item displays a tuning
setting between 0 and 127 as well as an RSSI level in dBm.
Press the up or down
buttons to change the tuning setting in order to maximize the receive signal level. Once
the highest signal is achieved, exit the Alignment mode by pressing the Menu button
again.
20- Firmware Upgrade
allows users to upgrade the FMBM’s operating firmware to install
new versions that could incorporate improvements, new features and corrections to bugs.
Selecting this menu item, without pressing the upgrade button, also shows the current
version number of the firmware installed in the unit. See Appendix A for details.
21- Exit
exits the Menu selection mode and returns to the default display. Note that an Exit
exists at both the very beginning and very end of the Menu Selection mode. Firmware
version is also shown in the Exit screen.
