TB 43-0123
CU-991/AR
EIC: N/A
CU-991/AR Antenna Coupler
Type No.
AVUM
AVIM
1. Brief Description: Automatic Antenna Tuner CU-
AN/URM-25D
X
991/AR performs the function of automatically resonating
AN/URM-105C
X
the aircraft antenna to frequencies determined by the
AN/URM-120
X
associated transceiver and coupling the RF signal
AN/URM-157
X
between the transceiver and the aircraft antenna. When
AN/USM-223
X
resonating the antenna, the CU-991/AR compensates for
AN/USM-281A
X
antenna reactance and maintains the effective antenna
DA-75/U
X
resistance at 52 ohms. This coupler is designed for use
ME-26D/U
X
with transceivers with a frequency range of 2 to 25 MHz
MK-722/URC
X
and a transmitter power output of 50 to 150 watts. Any
TK-100/G
X
fixed wire antenna between 45 and 100 feet in length
TK-101/G
X
and most grounded-end antennas of similar length may
TK-105/G
X
be used but in some cases may require a different size
TV-7D/U
X
shunt capacitor than supplied. Input power requirements
ZM-16/U
X
are 27.5 volts DC at 3 amps and 115 volts AC, 400 Hz,
3. Applicable Publications:
single-phase at 20 volts a. The following component is
used with but not issued as part of the CU-991/AR:
TM 11-5915-201-15
TM 11-5915201-20
MT- 1719/AR .................... Mounting
TM 11-5915-201-34P
2. Applicable Tools and Test Equipment:
See Appendix B for nomenclature, NSN, etc.
II-A-43
