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 SB 740-91-01
Step
Settings and Instructions
Normal Indication
2
(c) Key the transmitter and adjust A6R1l
Power at each position (This
(cont.)
V4 bias potentiometer on the power am-
checks all transmitter
plifier for 1.5 volts across A6J6 and
Xtals.)
J7. Unkey and disconnect the VTVM.
Starting at indent 39 on the ten mega-
cycle control, proceed to 22 checking
for power at each position, go back to
39 and perform the power check for the
whole and tenth megacycle position.
3
Power Output
Refer to figure B-18 and connect the RF
Output as read on the
meter is at least 16 watts.
the Receiver-Transmitter unit using an
Also note that the average
approximate length of (10 feet of RG-9/V)
output for the 19 channels
cable. At each frequency in the tabulation
shall be at least 20 watts.
below, observe that the frequency selection
is symmetrically displayed in the read-out
windows of the control unit. Key the
transmitter and observe the following.
Frequency
Frequency
Channel
(MHz)
Channel
(MHz)
1
225.1
10
314.6
2
233.8
11
321.1
Guard
243.0
12
339.7
3
250.6
13
345.4
4
258.6
14
356.5
5
268.2
15
365.4
6
270.6
16
372.5
7
283.4
17
382.6
8
291.3
18
399.9
9
306.2
4
Sidetone Tests
For Receiver-Transmitter RF-742/ARC-51BX,
use procedure (a); for Receiver Transmitter
RT-752B/ARC-51BX use procedure (b).
Refer to figure B-18.
B-77
SB 740-91-01
Step
Settings and Instructions
Normal Indication
4
(a) Using not less than 3 widely separate
The audio output power is 100
(cont.)
frequencies, key the transmitter and
milliwatts.
talk into the microphone.
Listen to the sidetone output at the
The sidetone output should be
headset H-lOlA/U to check for normal
indicated as not less than 14
audio level characteristics
If milliwatts at 30 percent
questionable, check for proper opera-
modulation.
tion by feeding a 100 Hz signal into
the DUM MIC Jack with Audio Oscilla-
tor TS-382D/U, at a level of 3 db be-
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