Pulsar TC-10B, User Manual

Page: 63 / 190

1. On the Keying Module control panel, press
the bottom push button (marked “LL”), to key
the Transmitter at Low Level power.
2. Record the Selective Level Meter reading (at
TJ1, TJ2). The meter should measure
.0707Vrms (-10dBm at 50
Ω
reference) for
Low-Level keying (1W power). If the meter
measures -10dBm, skip to Step 5.
3. If the meter does not measure -10dBm, 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.
4. Adjust the 1W potentiometer (R12) on the
Transmitter Module, until the Selective Level
Meter (at the 10W PA TJ1, TJ2) reads
.0707 Vrms (-10dBm at 50 Ω reference).
Then place the Transmitter Module back in
the chassis.
5. On the Keying Module control panel, release
the “LL” push button to un-key the
Transmitter Module.
5.6.3 Check Voice-Level Output
Perform this procedure only if you are using the
Voice Level Option.
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:
1. Key the carrier set with the Push-to-Talk
switch (on the handset), while muting the
microphone, to key the Transmitter at Voice-
Level (4.3W power, when High-Level is 10W
power).
2. Record the Selective Level Meter reading (at
TJ1, TJ2). The meter should measure
.148Vrms (-3.6dBm at 50
Ω reference) for
Voice Keying. If the meter measures -3.6dBm,
skip to Step 5.
3. If the meter does not measure -3.6dBm, 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.
4. Turn the Voice Adjust potentiometer (R14), on
the Transmitter Module, until the Selective
Level Meter (TJ1, TJ2) reads .148Vrms (-
3.6dBm at 50
Ω reference). Then place the
Transmitter back in the chassis.
5. Monitor the output of the carrier set with an
oscilloscope at the 10W PA Module test jacks:
• TJ1
• TJ2
6. Voice key the Transmitter by pushing the
Push-to-Talk switch (on handset) and using
the signal generator at 1 kHz (TB5/2 and 3) to
set the level to achieve the following voltages:
October 2003 Page 5–5
Chapter 5. Installation / Adjustment Procedures
5
NOTE
We recommended that you set the low level power
10dB below full power. However, you may use any
power level between 10W and 50mW.
NOTE
The “V” LED should show red.
NOTE
The “LL” LED should not be red.
NOTE
If a full power level (other than 10W) is used, the
VF level should be set accordingly, i.e., 3.6dB
below the High-Level value.