Pulsar TCF-10B, System Manual, Page: 65 / 249

5. Observe the front panel voltages to make sure
they are as specified in Step 2 above. Both
LEDs should be “ON”.
6. Return to nominal dc voltage.
5.4.2 Transmitter Tests
Input/Output Levels
Use the Selective Level Meter to measure levels
per Table 5-3. If the 10W PA input level is not
within limits, place the Transmitter module on an
extender board (see Figure 4-1), and make the
adjustments with controls per Table 5-3.
Transmitter Frequencies
Monitor the output frequency of the XMTR with
the Selective Level Meter. If this frequency is
incorrect by > ± 10 Hz, adjust the unshifted
frequency with C19 (on the Transmitter module)
to 250 kHz (or the required frequency) ± 1 Hz.
Use the “SH” and “SL” buttons on the Keying
module to shift the output frequencies. The shift
should be in accordance with Table 5-3 (within ±
10 Hz).
If the shifts are incorrect, set the shift (with S5) on
the Transmitter module.
Observe the module LEDs shown in Table 5-4
below:
April 1997 Page 5–3
Chapter 5. Acceptance Tests
5
Table 5–4. Transmitter LEDs.
Keying 10W PA
H.L. “TX” “TRANSMIT”
1 W OFF ON ON
10 W ON ON ON
CURRENT (Amps)
VOLTAGE TX Only RCV TXCVR
Key @ 1 W Only Key @ 10 W
48 Vdc 0.7 – 0.9 0.3 – 0.6 0.9 – 1.1
125 Vdc 0.2 – 0.4 0.15 – 0.25 0.3 – 0.5
250 Vdc 0.1 – 0.2 0.05 – 0.15 0.15 – 0.25
Table 5–2. Voltage Specifications.
Table 5–3. Transmitter Output Levels.
Keyed 10W PA Output Across RF Interface 10W PA* XMTR
Level Input 50 Ohms Line-Common *** Control Adjust
Normal (1 W) -10.2 to -9.8 dBm 29.8 to 30.2 dBm 29.8 to 30.2 dBm —- R12
(69.1 to 72.35 mVrms) (6.91 to 7.235 Vrms) (6.91 to 7.235 Vrms)
HL (10 W)** -0.2 to + 0.2 dBm 39.8 to 40.2 dBm 39.8 to 40.2 dBm Input R13
(210 to 230 mVrms) (21.00 to 23.00 Vrms) (21.00 to 23.00 Vrms) Level
* Set the 10W PA control first, so that the output across 50 Ohms is 40 dB greater than the input to the 10W PA.
Then adjust R12 (or R13) to obtain specified levels across 50 ohms.
** Push HL test button on the Keying module to obtain a 10 W level.
*** When strapped for 50 ohm and terminated in 50 ohm; values will be different for 75 ohm and for 100 ohm.