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|  TM 11-5820-509-35
Section
Action required
Reference standard
AM -3506/PRC-47
1.
Make initial settings and adjustments.
1.
(a) Set R54 for I watt output.
(b) Set R27 for 3.5 volts p-p at MIKE AMPL OUT jack.
(c) Set R40 so that VOX ON lamp lights.
(d) Set R46 for 20 volts pep at RX AUDIO OUT jack.
Waveshape is symmetrical.
2.
Record maximum output levels, receive
2.
(a) At RX AUDIO OUT jack, not less than 1 watt (18 volts
mode.
rms across 300 ohms).
(b) At +AGC jack, not less than +14 volts dc.
(c) At -AGC jack, more negative than -5.5 volts dc.
3.
Record
frequency
response
and
3.
(a) Frequency response. shall not vary more than 3 dB
distortion, receive mode.
from the 1700 Hz value in range from 300 to 3000-Hz.
(b) Distortion shall be no more than 8% in range from 300to
3000-Hz.
(c) +AGC jack, not less than 7.0 volts dc in range from 300-
to 3000 Hz.
(d) -AGC jack, not less than-3.0 volts dc in range from 300-
to 3000 Hz.
4.
+ AGC jack, not more than 0.5 volts dc.
4.
Record AVC signal gate operating level.
5.
(a) Input level not more than 0.015 volts rms At 1700 Hz for
5.
Measure input level and record harmonic
sinusoidal output.
distortion and frequency response below
(b) Harmonic distortion shall not exceed 5% from 300. to
the clipping and compression threshold
3000. Hz.
levels.
(c) Frequency response shall not vary more than 2.5 dB
from the 1700 Hz value in the range from 300- to 3000-
Hz.
6.
Frequency response shall not vary more than 2.0 dB from
6.
Record frequency response at nominal
the 1700 Hz value in the range from 300 To 3000.Hz
output level.
7.
(a) MIKE AMPL OUT jack, 3.5 volts peak-to-peak.
7.
Record operation of CW oscillator
(b) MIKE AMPL OUT jack, 800 50 Hz.
(c) No clicks or chirps heard in loudspeaker.
(d) VOX ON lamp lights.
1.
(a) Set C15, C17, L6, L7, and T3 for maximum at AUDIO
1.
Make initial settings and adjustments.
AM-3507/PRC-47
OUT jack.
(b) Select value of R14, if necessary. to obtain 0.5 volts
rms at XMTR OUT jack.
(c) Set R5 and C35 for minimum carrier leakage at XMTR
OUT jack.
2.
Read signal generator output necessary to produce 0.1 volt
2.
Perform output test, receive mode.
rms at AUDIO OUT jack. shall not exceed 200
microvolts.
3.
(a) Read AUDIO OUT jack. not more than 5% from 497.0 to
3.
Record distortion in audio pass. band.
499.7 kHz.
(b) Oscilloscope at AUDIO OUT shows no spikes or ripple
4.
Record selectivity
with O.05 volt input signal and AGC switch on.
4.
The frequency difference between -60 dB points in the pass
5.
Record frequency response.
receive
band shall not be more than 6.0 kHz.
mode.
5.
Frequency response shall not vary more than 3 db above, nor 4
dB below the reference value at 498.3 kHz in the range
from 497.0 to 499.7 kHz.
CY-1377A/PRC 47
1.
(a) Set slugs of L1 L2. and L3 to a depth of 7/32 from bottom
1.
Perform mechanical alignment.
of coil form.
(b) Set slug of L4 to depth of 5/32 from bottom of coil form.
(c) Set slug of L5 to depth of 1/4 from bottom of coil form.
(d) Set slug of L145 to depth of 9/32 from bottom of coil
form.
2.
Set C248. C250. C252. C254. C256, C258. C260, C262,
2.
Align 5- to 14-MHz ringer circuit.
C264 and C266 At 1-MHz increments for maximum
output at 5 to 14 MHz jack. Must Be at least 0.9 volt
peak to-peak.
6-10
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