Pulsar TC-10B, User Manual

Page: 64 / 190

•
∪
62V p-p (at peak modulation)
•
∪
20V p-p (valley)
7. If the ratio of the voltages (0.62/0.20) do not
approximate a value of 3, adjust poten-
tiometer R11 on the Transmitter, as follows:
• Clockwise if not enough signal (a value
less than 3).
• Counterclockwise if too much signal (a
value significantly greater than 3).
8. Un-key the Push-to-Talk switch (on handset).
5.6.4 Adjust the Transmitter Power
Output Levels
1. Move the Selective Level Meter to the test
jacks marked “LINE” (on the RF Interface
control panel): TJ1 (Line – top jack) and TJ2
(Common – bottom jack)
2. On the Keying Module control panel, press
and hold the bottom (“LL”) push button to
key the Transmitter at Low-Level power.
3. On the RF Interface Module control panel,
configure the output impedance by setting a
Jumper. The Selective Level Meter (TJ1, TJ2)
should show a maximum reading (Vrms) for 1
W (+30dBm) power, as follows:
• JU4, when set, provides 50 Ω (7.07Vrms)
• JU3, when set, provides 75 Ω (8.6Vrms)
• JU2, when set, provides 100
Ω
(10.0Vrms)
4. If the above (Vrms) values are not achieved,
adjust the “INPUT LEVEL SET” poten-
tiometer (R53) on the 10W PA Module control
panel to obtain 7.07Vrms (for 50
Ω
reference).
5. On the Keying Module control panel, release
the “LL” push button to unkey the Transmitter
Module.
6. Check the High-Level key for 10W output.
7. Turn power “OFF” at the Power Supply
Module.
8. Remove the 50, 75, or 100 Ω resistor termina-
tion and replace the coaxial cable connection
to the Line Tuner.
5.7 Offset TC–10B Transmitter
Frequency
It the Transmitter frequency needs to be offset
(for- three-terminal line applications), monitor the
Transmitter frequency with a Frequency Counter.
1. Make sure that the power is “OFF” at the
Power Supply Module and remove the
Transmitter Module from the chassis.
2. On the Transmitter Module, turn rotary switch
S4 to raise or lower the Transmitter frequency
(in 100Hz steps) as follows:
a) At Transmitter #1 (near end), turn rotary
switch S4 clockwise to raise the frequency
(center fre100Hz).
b) At Transmitter #2 (far end), turn rotary
switch S4 counterclockwise to lower the
frequency (center frequency –100Hz).
Page 5–6 October 2003
TC–10B System Manual
Technologies, Inc.
NOTE
The “LL” LED should show red.
NOTE
If you want a final output power of less than 10 W,
reduce power by adjusting the input level poten-
tiometer (R53) on the 10W PA Module for the lower
power. If a sufficiently low level is not obtainable
using R53, repeat the above alignment procedures
using the reduced level.
NOTE
Customer personnel should use voice communi-
cations while working simultaneously, with
transmitter #1 (near end) and transmitter #2 (far
end), to perform the following procedure:
NOTE
The third terminal’s transmitter should remain at
center frequency.