TM 11-5985-371-12&P
PRINCIPLES OF OPERATION
Section IV.
4-9. General. The AS-3577/GRC permits transmission or reception of rf energy
in the 2-30 MHz frequency range. It is an omnidirectional, broad band,
double delta antenna that can receive or transmit rf signals over.a distance
up to 380 miles. When used for transmission, it can handle power up to a
maximum of 1 kilowatt.
4-10. Circuit Description. Refer to the schematic diagram below. The letters A, B,
C, and D are terminal designations assigned during installation (para 2-5). They
are not equipment markings. During reception or transmission, rf energy is con-
ducted to or from the receiver or the transmitter, respectively, through the coaxial
rf cable(s). The rf cable(s) is connected to the balun. The balun transformer
matches the 50-ohm impedance of the rf cable to the 600-ohm input impedance of the
antenna. The antenna radiating and receiving device is formed by wires configured
into two delta arrangements. As configured, one half of one continuous antenna
wire, and one half of the other continuous antenna wire form one delta, and the
remaining halves form the other delta. The peaks of the two deltas are connected to
the 600-ohm terminating resistor box.
SCHEMATIC
DIAGRAM
ANTENNA
AS-3577/GRC
ORGANIZATIONAL
TROUBLESHOOTING
Section V.
4-11. General. Troubleshooting at the organizational category is limited to visual
checks and the use of a multimeter to isolate faults to the terminating resistor
box, the balun, antenna wire, and electrical cables.
4-12. Troubleshooting Table. The malfunctions listed in table 4-2 can show up
during operation of the radio, during scheduled PMCS (tables 2-1 and 4-1), during
assembly and preparation for use (para 2-5), during preparation for movement
(para 2-6) or during corrective maintenance.
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