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 SB 740-91-01
Step
Settings and Instructions
Normal Indication
3
(d) Press the H-189/GR(H-250/U) push-to-talk
The minimum acceptable
(cont.)
switch, and record the power output indicated
reading is 1.5 W for
on Bird Model 61. Release the H-189/GR push-
30.05 and 30.95 MHz,
to-talk switch
and 1.0 W for the
other frequencies.
(e) Repeat the test for frequencies of 30.05,
52.95, 53.05, and 75.95 MHz.
Frequency accuracy
(a) Set the power supply for 12.5 VDC and connect
to "POWER" connector on the front panel of the
RT-841/PRC-77 with Test Cable No. 2.
(b) Connect the test equipment in accordance with
(c) Energize all test equipment. On the RT-841/
PRC-77, set the function switch on the "ON"
position and the frequency to 30.05 MHz.
(d) On the AN/USM-207, set the controls as
follows:
(1) Sensitivity switch to "100 V" positi on.
(2) Time base switch to "Gate Time (secx)-102."
(3) Set function switch to "Freq."
(e) Press the H-189/GR (H-250/U) push-to-talk
switch.
(f) Adjust AN/USM-207 sensitivity switch counter-
clockwise until a stable reading is obtained.
(g) Record the frequency indicated on both the
The reading on the RT-
RT-841/PRC-77 and the AN/USM-207
841/PRC-77 will be
within 3.5 kHz on the
AN/USM-207 reading.
(h) Repeat the test for frequencies of 30.95;
52.60, 52.70, 52.80, 52.90, 53.10, 53.20,
53.30, 53.40, 53.50, 75.95 MHz.
(i) Adjust the power supply output to 10.0 VDC
and repeat the test for frequencies of
30.95, 53.90, 53.80, 53.70, 53.60 MHz.
(j) Adjust the power supply output to 15.0 VDC
and repeat the test for frequencies of
75.50, 52.40, 52.30, 52.20, 52.10, 52.00 MHz.
B-61
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