SECTION Ill. PRINCIPLES OF OPERATION

TM 11-5985-370-12

SECTION Ill. PRINCIPLES OF OPERATION

1-13. GENERAL PRINCIPLES OF OPERATION

INPUT TRANSFORMER: Your radio is connected by the 50 foot RADIO CABLE to the 166 foot

HALF-RHOMBIC ANTENNA through this transformer:

It is connected as a step-up transformer with a ratio of 1 to 9.

This ratio allows proper matching to get maximum transmitter power from your radio transmitter to

the antenna (over a wide frequency range without adjustments)

and

maximum received RF signal from the antenna to your radio receiver.

HALF-RHOMBIC ANTENNA: The 166' of field wire is the actual RF radiating and pickup element in the

antenna system.

TERMINATION TRANSFORMER: It is connected as a step-down transformer with a ratio of 9 to 1.

Used to properly connect the end of the 166' antenna and the DISSIPATION CABLE.

Note: Any transformer can operate in any position.

DISSIPATION CABLE. Acts in place of a counterpoise and a resistive element to produce the SHARP-

UNIDIRECTIONAL - ANTENNA PATTERN.

1-17