Section I. INTRODUCTION
communications at frequencies up to 10 MHz.
Operation at higher frequencies provides
bidirectional azimuthal coverage for ranges of
The Transportable antenna (Collins 637T-2) is an
approximately 300 to 1,000 miles. The phosphor-
adjustable dipole antenna designed for use with
bronze wire rope radiating elements of the Collins
portable, tactical, and amateur radio systems. It can
637T-2 are extremely durable and do not reflect
also be used effectively as a backup antenna for
sunlight. The elements can be set to resonate length
vehicular and shelter-mounted communication
by observing the dials built into the housing. A
It is capable of operating on
ferrite balun in the antenna housing transforms the
communication circuits extending to 1,000 miles.
balanced dipole circuit to 60 ohms unbalanced. The
The Collins 637T-2 is operational in the 3.4- to 30-
antenna can be deployed by one man in 5 to 20
MHz range. At dipole heights of 15 to 40 feet, the
Collins 637T2 provides short range skywave
Figure 13-1. Transportable antenna (Collins 637T-2).