Pulsar TC-10B, User Manual

Page: 79 / 190

7.3 ELECTRICAL TESTS
1. Refer to Figure 3-4 or Figure 7-1 for keying
and output connections.
2. Connect the dc supply to the appropriate
terminals on the rear panel (see Figure 3-4 or
Figure 7-1).
3. Terminate the Transmitter output with a
noninductive 50 Ω , 10W resistor.
4. Connect the Selective Level Meter (Rycom
6021A) across the 50 Ω resistor load.
5. Allow a one-hour warm-up period before
making the final frequency adjustments.
7.3.1 Power Supply Module Tests
1. Remove all modules except for the Power
Supply Module.
2. Turn “ON” the dc power; measure the dc
voltage at the Power Supply test jacks with
the meter reference connected to TJ2:
• TJ1/TJ2 (+20Vdc ± 1Vdc).
• TJ3/TJ2 (-20Vdc ± 1Vdc).
3. Turn “OFF” the dc power.
Insert all modules into their appropriate slots
in the chassis.
4. Repeat Step 2 (above). Both LEDs (D3, Input,
and Dl1, Output) on the Power Supply
Module must be “ON”.
5. Place the current meter (Fluke 75 or equiva-
lent) in series with the dc supply, and check
the standby (unkeyed) current for the appro-
priate voltage source, as follows:
VOLTAGE CURRENT
48Vdc .6A to .8A
125Vdc .4A to .6A
250Vdc .1A to .2A
7.3.2 Transmitter Module Tests
Levels
1. Using the appropriate voltage (15V, 48V,
125V, or 250V), key the carrier start and
observe that the level across the 50
Ω load is
approximately 10W per Table 7-3.
2. Using the Keying Module push button
switches, key the Transmitter (XMTR)
Module for low-level (LL/1 W) and high-
level (HL/10 W) power, as shown in the table
below. If the voltage across the 50
Ω
load is
not approximately equal to the value shown in
Table 7-3, place the Transmitter (XMTR)
Module on an extender board and make
adjustments (using R13 for 10W and R12 for
1W, respectively).
3. Using the keying inputs on the rear of the
chassis, key the Transmitter using the combi-
nations listed below. Observe the output levels
and logic per Table 7-4:
October 2003 Page 7–3
Chapter 7. Design Verification Tests
7
!
CAUTION
ALWAYS TURN “OFF’ dc POWER WHENEVER
REMOVING OR INSTALLING MODULES.
NOTE
Prolonged operation with no load can cause the
power supply to shut down (see Chapter 9,
Section 9.2.2).
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.
Keyed Volts Across XMTR dBm REF
Level 50
Ω
Load Adjust
(V rms)
LL – 1 W 7.07 R12 +30dBm
HL – 10 W 22.4 R13 +40dBm
Table 7–3. Voltage Levels.