Page 4-8
Vector-LP Radio Beacon Transmitter Technical Instruction Manual
Issue 1.1
Section 4 Testing and Adjustment
(h) In the Keyer Modulation menu, set
Modulation and Tone Generator to ON.
Set the Tone Frequency to 400 Hz or
1020 Hz.
(i) In the Audio Levels menu, while
monitoring the Mod %, increase the
PTT Keying Pot value until the Mod %
is at the desired depth. If the
modulating signal begins to distort,
stop increasing the modulation depth.
The total modulation depth cannot
exceed 95%.
(j) In the Keyer Modulation menu, set
Keyer to ON.
4.3.5.9 SETTING STANDBY CODES
See 3.6.13.1,
Setting the Keyer
.
4.3.5.10 SETTING THE KEYER
See
Setting the Keyer
(3.6.13.1).
4.3.5.11 SETTING THE ANTENNA
CURRENT LEVEL
Adjust the antenna current to the desired
level and set the antenna current feedback
feature as follows:
(a) Ensure the serial interface cable is
installed between the transmitter (at
the
INTERNAL RS-485
connector on
remote interface PWB A3) and the
ATU.
(b) Apply power to the ATU.
(c) In the Power menu (see 3.6.15), set
the antenna current feedback to
OFF
.
(d) Adjust the transmitter for the desired
antenna current by adjusting the output
power level.
(e) Ensure that the changeover mode and
monitor thresholds have been set (see
4.3.5.5)
(f) In the Power menu, set the antenna
current feedback to
ON
.
NOTE
When antenna current feedback is
enabled, the transmitter will adjust the
output power to ensure that antenna
current remains constant. With each
power adjustment, a new high and low
forward power threshold is calculated. In
this case the low and high power
thresholds have essentially become low
and high antenna current thresholds.
4.3.6 Non-Standard Adjustments
The following non-standard adjustments
are described in this section. They have
been factory set prior to shipping and do
not require verification or re-calibration
unless an unintentional adjustment has
been made or a fault has occurred.
4.3.6.1 Changing
Frequency
4.3.6.2
Changing RF Filter Tap Settings
4.3.6.3
Calibrating Transmitter Output Power
4.3.6.4
Calibrating Exciter Dc Voltages and
Ambient Temperature
4.3.6.5 Calibrating
PDM
4.3.6.6
Calibrating Reflected Power
Threshold and Output Network Alarm
4.3.6.7
Setting the RF Monitor Level
4.3.6.8
Calibrating the Ac Failure Alarm
4.3.6.9
Adjusting for RF Drive Symmetry
4.3.6.10 Equalizing Exciter Gain (Dual Exciter
Transmitters Only)
4.3.6.11 Calibrating Battery Voltage, Current
and Charger Current(Optional)
4.3.6.12 Setting Display Contrast
4.3.6.13 Adjusting
Speaker
Volume
4.3.6.14 Reading
Modulation
Level
(a) Verify the initial turn-on requirements
of paragraph 4.3.4 have been
completed and are being met.
4.3.6.1 CHANGING FREQUENCY
To perform a frequency change, perform
the following steps in order:
(a) Press
RF Off
.
