Belar FMHD-1, Operator'S Manual

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FMHD-1 Operator’s Manual
Page 24 FMHD-1
The popup menus listed in this section appear in the popup menu directory. The popup menu directory is
accessed from any screen by depressing the encoder knob for two seconds. For convenience, the RF
Spectrum Popup Menu is described as part of the discussion about the RF Spectrum Screen, in Section
7.3, beginning on page 30.
The Popup Menu categories and their associated domains of control follow:
RF Controls for the RF input, tuning, calibration, and output muting
Composite Controls for the composite filter bandwidth and peak modulation settings
Spectrum Controls for the RF spectrum display
Settings Controls for metering and display properties, audio outputs, networking connections, e-mail
messaging, troubleshooting data for the HD decoders, and unit software version and serial information.
6.1 RF Popup Menu
Input Select:
Allows selection between “High Level” and “Antenna” inputs.
Tuning:
Enables the encoder knob to tune the FMHD-1 input from 87.3 MHz to 108.1 MHz in 100-kHz
increments and in wrap-around fashion. This functionality duplicates the station tuning on the Main
Tuning Screen, but allows one to tune to alternate stations without leaving the screen present in the
display.
Calibrator:
Selects among seven internal test signals used to verify accuracy of the FCC-standard
modulation indications presented in the FMHD-1 Analog FM Stereo Screen. These test signals also
confirm proper operation of the analog FM demodulator which provides these indications. The
demodulated test signals appear at the FMHD-1 Composite Output on the rear panel. However, the
calibration signals do not pass through the demodulator which provides the audio metering indications
and audio output of the analog portion of the hybrid FM IBOC signal. Nor are the calibration signals
visible on the RF Spectrum Screen.
OFF - The Calibrator is disabled. The
FMHD-1
functions normally.
ZERO - A data stream with no modulation is applied. Spectrums and outputs are silent.
Mono 1 kHz -A 1-kHz monaural signal with 75 kHz peak deviation, or 100% modulation.
Left 1 kHz
-A 1-kHz left-only signal with 90% L modulation. Because of interleaving effects between the
L+R, the L–R, and the pilot in the composite signal, Total modulation reads 95.6%.
Left 5 kHz -A 5-kHz left-only signal with 90% L modulation. Interleaving causes Total to read 96.2%.
Left 11 kHz -An 11-kHz left-only signal with 90% L modulation. Total reads 95.7%.
Left 15 kHz -A 15-kHz left-only signal with 90% L modulation. Total reads 96.3%.
Mute:
The FMHD-1 composite and audio outputs are disabled when Mute is active. These outputs are
disabled when the user manually selects “
ON
” for the Mute option in the RF Popup Menu. When “
AUTO
”
is selected, muting of both occurs when the RF input level for either the “
High Level
” or “
Antenna
”
input, whichever is active, drops below the corresponding user-set “ Loss of RF ” alarm threshold set in
the Alarm/Relay Screen. Note that the RF level must remain below the alarm threshold for the time