Page 4-4
Vector-LP Radio Beacon Transmitter Technical Instruction Manual
Issue 1.1
Section 4 Testing and Adjustment
NOTE
During initial turn-on and adjustment of
transmitter power, the diagnostic display’s
meters screen should be monitored.
Various input parameters, such as
Forward Power
,
Average B+ Voltage,
and
Total Dc Current
should be displayed
while the transmitter RF output power is
being increased.
If the diagnostic display indicates an alarm,
discontinue adjustment of the transmitter
and press the
Status
button to determine
the nature of the fault.
4.3.5 Standard Adjustments
The following standard adjustments are
described in this section. Verify them after
transmitter commissioning.
4.3.5.1 Setting Sonalert Remote Control
States
4.3.5.2 Setting Low Battery Threshold
4.3.5.3 Setting Default Monitor States
4.3.5.4 Adjusting Audio Limiter
4.3.5.5 Setting Changeover Mode and RF
Monitor Thresholds
4.3.5.6 Verifying Exciter Changeover
Thresholds
4.3.5.7 Setting Mod Depth in Beacon Mode
4.3.5.8 Setting Mod Depth in Beacon and
Voice Mode
4.3.5.9 Setting Standby Codes
4.3.5.10 Setting the Keyer
4.3.5.11 Setting the Antenna Current Level
4.3.5.1 SETTING SONALERT REMOTE
CONTROL STATES
Use the sonalert menu to allow a
transmitter alarm to generate a change in a
control points state. See
Configuring the
Sonalert
(3.6.10).
4.3.5.2 SETTING LOW BATTERY
THRESHOLD
If a dc power source (battery) is used, see
Selecting Power Source
(3.6.9) to set the
DC disconnect and reconnect levels.
4.3.5.3 SETTING DEFAULT MONITOR
STATES
If the optional NDB site interface PWB (A4)
is installed, see 3.6.14.1 and 3.6.14.2 to
set default monitor states.
4.3.5.4 ADJUSTING AUDIO LIMITER
Adjust the audio limit threshold as follows:
(a) Adjust the remote interface PWB (A3)
AUDIO LEVEL
potentiometer (R37)
fully clockwise.
(b) Connect an audio signal at the desired
level (between -20 dBm and +10 dBm,
in a 600
:
load) to the
AUDIO INPUT
(+)
(TB1-14) and
(–)
(TB1-16)
terminals of the remote interface PWB.
(c) The system diagram’s
External Alarm
LED should turn on.
(d) In the Configure Sonalert menu (see
3.6.10), set the Mod Protection alarm
signal to
ON
.
(e) In the Select Peripherals menu
(3.6.13.5), select Sonalert Buzzer. The
sonalert will sound an alarm.
(f) Adjust
the
AUDIO LEVEL
potentiometer counter-clockwise until
the alarm stops, noting there is a five
second delay between the adjustment
and the alarm reaction. The
External
Alarm
LED should also turn off.
(g) Sweep the test signal’s frequency
across the desired frequency band.
Adjust the
AUDIO LEVEL
potentiometer when an audible alarm
occurs so that the level is as high as
possible without generating an alarm.
(h) In the Configure Sonalert menu (see
3.6.10), set the Mod Protection alarm
signal to
OFF
, if desired.
