Pulsar TCF-10B, Системное руководство, Страница: 80 / 249

6.4 Select TCF–10B Transmitter
RF Output Impedance
1. Configure the RF Output Impedance.
Remove the RF Interface Module from the
TCF–10B chassis and configure the output
impedance by setting jumpers:
• JU4 when set, provides 50 ohms
• JU3 when set, provides 75 ohms
• JU2 when set, provides 100 ohms
2. Select 2- or 4-wire Receiver Input, using
jumpers JU1 and JU5:
• IN position for 2-wire (not normally used
for TCF–10B)
• OUT position for 4-wire (both JU1 and JU5
must be OUT)
3. If you are using an external hybrid chain, a
higher sensitivity may be desirable. Set
jumper JU6 to HIGH.
4. Insert the RF Interface Module back into the
TCF–10B chassis.
6.5 Check Line Tuning and
Matching Equipment
1. Refer to the appropriate instructions for line
tuning equipment.
2. Perform the required adjustments.
6.6 Check TCF–10B Transmitter
Power Levels and
Frequency
Turn “ON” the power and check the dc voltage
outputs from the Power Supply Module. Then,
turn “OFF” the power and remove the coaxial
cable connection to the Line Tuner and substitute
a 50, 75, or non-inductive 100 ohm resistor termi-
nation (in accordance with the jumper settings in
6.4-1).
6.6.1 Check High-Level Output
1. Connect the Selective Level Meter to the 10W
PA Module control panel, at 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 pushbutton (marked HL) to
key the Transmitter at High Level power.
The “HL” and “TX” LEDs should show
red.
5. Record the Selective Level Meter reading (at
TJ1, TJ2). The meter should measure .224
Vrms (0 dBm at 50 ohm reference) for full
High-Level keying (10 W power). If you
measure 0 dBm, skip ahead to Step 8.
6. If the meter does not measure 0 dBm, turn the
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.
Page 6–4 April 1997
TCF–10B System Manual
Technologies, Inc.
!
CAUTION
DO NOT ALLOW INEXPERIENCED PERSONNEL
TO MAKE THESE ADJUSTMENTS. PERSONNEL
MUST BE COMPLETELY FAMILIAR WITH THE
HAZARDS INVOLVED.