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|  TM 11-5820-518-20
1-5. Technical Characteristics
Receiver audio headset . . ..150 ohms, noninductive with
Frequency range
provision for 600 ohms.
AN/ARC-51X . . . . . . . . . . 225.0 to 399.9 mc.
Auxiliary audio . . . . ...20,000 ohms.
AN/ARC-51BX . . . . . . . . . . 225.0 to 399.95 mc.
Microphone, input-
carbon . . . . . . . . . . . . . ..82 ohms.
Frequency channels
Microphone, input-
AN/ARC-51X . . . . . . . . . . ..1,750 selectable channels,
dynamic . . . . . . . . . . . . . . ..l50 ohms.
plus fixed guard channel
Audiofrequency response . ...300 to 6,000 cycles per
on receive.
second with not more
AN/ARC-51BX. . . . . . . . . .3,500 selectable channels,
than + 1 or --3 db varia-
plus fixed guard channel
tion relative to response at
on receive.
1,000 cps.
Channel spacing
Frequency stability
AN/ARC-5lX . . . . . . . . . . . .100 kilocycles.
Transmitter . . . . . . l0 kc.
AN/ARC-51BX . . . . . . . . . . ..50 kilocycle.
Guard receiver . . . . . . . . . 13 kc.
Frequency control . . . . . . . . . . . . Crystal-controlled.
Main, receiver . . . . . . . . . . .l0 kc.
Radio frequency output
Channel-changing time . . . . . . . . not more than 6 seconds.
power . . . . . . . . . . . . . . . . . . . . .16 watts minimum for all
channels.
Receiver sensitivity . . . . . . . . . ...4.2 microvolt for 14-milli
1-6. Components of Radio Sets
watt output, with 10-
AN/ARC-51X and AN/ARC-51BX
decibel signal plus noise-
to-noise ratio.
a. Components of Radio Set AN/ARC-51X. This
Power requirements . . . . . . . ...27.5 volts dc 0.5, 12.25
listing is based on the original shipment by the
amperea, supplied by air-
contractor on Contract No. NOw (A)-63-0533. For
craft.
the current official listing of components of in-
Terminations:
Rf input and output . . . . . . . .52 ohms, noninductive.
dividual models, refer to paragraph 1-6.1.
Dimensions(in.)
Figure
Unit weight
Componennt
Quantity
No.
(lb)
Depth
Width
Height
1-1
9 9/16
7
15 1/8
28.7
1
Radio Receiver-Transmitter
RT-702/ARC-51X.
1-1
5 3/4
2.2
4 1/4
1
Radio Set Control C-4677/ARC-51X
3
9 1/2
14 1/4
0.5
1-1
1
1
Mounting MT-2653/ARC
1
Cooler, Air, Electronic Equipment
1-4
6 3/8
3 1/8
6 5/32
HD-615/ARC-51X.
1.0
1
Indicator, Standing Wave Ratio
ID-1003/ARC.
1.1
17/16
4 3/4
1-1
3 3/4
1
Radio Receiver-Transmitter
7
15 1/8
9 9/16
RT-742(*)/ARC-51BX.
1-1
29.2
4 15/16
1
4 3/16
5 3/4
Radio Set Control C-6287/ARC-51BX
3.8
1-2
1
Mounting MT-2653/ARC . . . . . . . . . . . . . . . . . . .
1
14 1/4
9 1/2
0.5
1-3
1
Cooler, Air, Electronic Equipment
3 1/8
HD-615/ARC-51X.
6 3/8
1.0
6 5/32
1-4
1
Indicator, Standing Wave Ratio
ID-1003/ARC.
3 3/4
17/16
4 3/4
1.1
1-1
1-6.1. Items Comprising an Operable Equipment
Quantity
NSN
Nomenclature, part No., and mfr code
AN/ARC-51X AN/ARC-51BX
NOTE
The part number is followed by the applicable 5-digit
Federal supply code for manufacturers (FSCM) iden-
tified in SB 708-42 and used to identify manufacturer,
distributor, or Government agency, etc.
Change 5
1-3
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