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CHAPTER 13. ANTENNA, TRANSPORTABLE
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TM-11-5820-554-12 Radio Set AN/FRC-93(V)1 AN/FRC-93(V)2 AN/FRC-93(V)3. AN/FRC-93(V)4 AN/FRC-93(V)5 AN/FRC-93(V)6 AN/FRC-93(V)7 Manual
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Figure 13-2. Antenna supported at housing.


TM 11-5820-554-12
13-2. Tabulated Data
Electrical:
Element length (2 ea)
73 feet
-60 to 140
Frequency range
3.4 to 30 MHz.
Temperature range
F
F
Horizontal
Humidity range
0 to 95%
50 ohms unbalanced (coaxial)
Wind and ice conditions
Withstands:
VSWR
Less than 2:1 relative to a 50 ohm
60-mph wind, 1/4 inch radial ice
source (average dipole height
(wires fully extended, housing
of 25 feet.)
supported, and wires tied off at
Power handling capability
1 kw pep or average.
ground level.
Directive gain
Similar to a half-wave dipole at the
60-mph wind, no ice (wires fully
same effective height.
extended and tied off at
Radiation characteristics
Similar to a half-wave dipole at the
approximately 25 feet above
same effective height.
ground.)
40-mph wind, 1/8 inch radial ice
Physical:
(wires fully extended and tied
Input RF connector
Type N receptacle
off at approximately 25 feet
(UG-58A/U)
above ground.)
13-3. Items Comprising an Operable Antenna, Transportable (Collins 637T-2)
Dimensions (in)
NSN
Item
Qty
Height
Depth
Width
Weight
(lb)_
5895-00-909-1873
Antenna, transportable, (Collins 637T-2) kit consisting of:
1
Antenna, transportable (Collins 637T-2)(Collins part
1
5
4
9
4
No. 772-5477-002).
5895-00-247-0186
50-foot RG-58/U coaxial cable with type N plug on one
1
end and phono plug on other end. (Collins part No.
776-9921-001)
Section II. INSTALLATION
NOTE
For proper dipole operation, be sure that
13-4. Site Selection
both  indicators  indicate  the  same
The Collins 637T-2 is adaptable to a wide variety of
frequency.
physical sites. However, the frequency of operation
d. Secure the wires at the desired length with
dictates the length of antenna elements; and this
the wire lock knobs (similar to binding posts)
should be considered when selecting a site.  For
mounted on the antenna housing.
maximum antenna operating efficiency, locate the
NOTE
Collins 637T-2 at the center of a clear area; avoid
The RF path from the transceiver to the
location near any tall metal objects.
After
antenna is through the coaxial cable,
determining the location of the antenna, the erection
through the balun, to the wire lock knobs,
of the antenna may proceed.
and to the dipole elements.
e. Connect the coaxial cable to the RF input
13-5. Erecting Procedure
connector on the antenna housing.
Erect the antenna as follows:
NOTE
a. Be sure that that all wire is wound onto the
The end of each wire is attached through a
reels.
swivel to a length of nylon rope. This is
b. Set both wire length indicator pointers to
the insulator as well as the ground stake
zero by loosening the indicator clamp knobs,
attachment.
positioning the indicators to zero, and retightening
f. Raise the antenna to the desired height by
the clamp knobs.
passing each rope over a tree limb, tower, or other
c. Pull both wires out of the housing until the
indicators indicate the desired frequency.
Change 4 13-2


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