Pulsar TC-10B, User Manual

Page: 62 / 190

5.5 Check Line Tuning And
Matching Equipment
1. Refer to the appropriate instructions for line
tuning equipment.
2. Perform the required adjustments.
5.6 Check TC–10B Transmitter
Power Levels
With power “OFF”, remove the coaxial cable
connection to the Hybrids or line tuning
equipment and substitute a 50, 75 or 100
Ω resistor
termination (in accordance with the jumper
settings in 5.3-1), at the output of the TC-10B (J1,
UHF connector).
5.6.1 Check High-Level Output
1. Connect the Selective Level Meter to the 10W
PA Module control panel at the test jacks:
TJ1 Input (top jack)
TJ2 Common (bottom jack)
2. Tune the meter to the Transmitter frequency.
3. Turn power “ON” at the Power Supply
Module.
4. On the Keying Module control panel, press
and hold the top push button (marked “HL”),
to key the Transmitter at High Level power.
5. Record the Selective Level Meter reading (at
TJ1, TJ2). The meter should measure
.224Vrms (0dBm at 50
Ω reference) for full
High-Level keying (10W power). If the meter
measures 0dBm, skip to Step 8.
6. If the meter does not measure 0dBm, turn
power “OFF” at the Power Supply Module
and remove the Transmitter Module from the
chassis. Place the extender board into the
Transmitter Module position of the chassis.
Then plug the Transmitter Module onto the
extender board.
7. Adjust the 10W potentiometer (R13) on the
Transmitter Module until the Selective Level
Meter (at the 10W PA TJ1, TJ2) reads
.224Vrms (0dBm at 50
Ω reference). Then
place the Transmitter Module back in the
chassis.
8. On the Keying Module control panel, release
the “HL” push button to un-key the
Transmitter Module.
5.6.2 Check Low-Level Output
With the conditions the same as for the High-
Level output check, i.e.,
• Selective Level Meter at 10W PA Module
control panel (TJ1, TJ2)
• Meter tuned to XMTR frequency
• Power “ON”
do the following:
Page 5–4 October 2003
TC–10B System Manual
Technologies, Inc.
!
CAUTION
DO NOT ALLOW INEXPERIENCED PERSONNEL
TO MAKE THESE ADJUSTMENTS. PERSONNEL
MAKING THE ADJUSTMENTS MUST BE
COMPLETELY FAMILIAR WITH THE HAZARDS
INVOLVED.
NOTE
The INPUT and OUTPUT LEDs should show red.
NOTE
The “HL” LED should show red.
NOTE
The “HL” LED should not be red.
NOTE
For the optional Transmit Time Limiter Transmitter
module, you must hold the Alarm Reset
Pushbutton in while doing these tests or it will turn
off.