TM 11-6625-486-14&P
1-8. Description
h. Additional Equipment Required. Six batteries
A description of the components of Frequency Meter
BA-30, not supplied with the equipment, are required for
AN/USM-159(*) is given below.
dc operation.
The
a. Frequency Meter FR-149(*)/USM-159.
frequency meter is transistorized throughout and can be
Frequency Meters AN/USM-159A and AN/USM-159B
operated from six Batteries BA-30 that supply 9 volts
are similar to Frequency Meter AN/SUM-159.
direct current (dc), or from a powerline source of 115 to
Information in this manual applies to all models unless
230 volts alternating current (ac), 50 to 450 Hertz (Hz).
otherwise specified. For exterior differences, refer to
Automatic switchover from batteries to ac power is
accomplished internally. All operating controls and
connectors are on the front panel. The meter dial is an
1-10. Tabulated Data
illuminated filmstrip with three ranges of frequencies
Frequency range:
calibrated in fundamentals. Crystal checkpoints, with
Range A ..................... 125 kHz to 2.5 MHz (125 to
arrows indicating the direction of the nearest checkpoint,
250 kHz on fundamentals).
are also in the filmstrip. Component parts of the
Range B ...................... 2.5 to 65 MHz (2.5 to 5 MHz
frequency meter are housed within a rectangular metal
on fundamentals).
case. When not in use, or during transport, a front
Range C ..................... 65 to 1,000 MHz (65 to 130
cover protects the panel controls and provides an
MHz on fundamentals).
immersionproof seal. The front cover has space for
Frequency readout .......... Direct readout in
storing the headset, antenna, rf cable, adapter power
fundamentals on calibrated
cable, and spare fuses. The calibration tables, which
filmstrip, magnified and
contain condensed operating instructions, and a list of
lighted.
fundamental frequencies and selected harmonics
Input and output signals:
produced by the frequency meter, are on a sliding panel
Input sensitivity ............ With an rf input signal of 0.1
under the frequency meter controls.
volt, an af output of 0.05
mw is obtained.
Output level ................ 100 uv minimum across an
end of the antenna is placed near the equipment being
external 50-ohm resistive
tested.
load. 40 uv at harmonics.
c. Cord CG-409E/U. The rf cable connects the
Accuracy ..................... 0.01% when temperature is
antenna to the frequency meter ANT. jack.
between -4 to +125
F
F
d. Adapter UG-641(*)/U. The adapter adapts the
(-20 to +52 ).
C
C
frequency meter ANT. jack to a pigtail clamp connector
Internal modulation ..... 900 Hz 300.
for use with a suitable cable to connect the frequency
Number of transistors ..... 12.
meter to remote equipment.
Power requirements:
e. Cable
Assembly,
Power,
Electrical
Battery operation ........ 9 volts dc, 50 ma (Battery
CX7782/USM-159 or CX-12005/USM-159. The power
BA-30(6)).
cable connects the power receptacle on the front panel
Ac line operation ......... 115 to 230 volts ac, 50 to
to the source of ac power.
450 Hz.
f. Headset H-216/U or HS-33. The headset is a
Weight ........................... 28 pounds.
low-impedance type for connection to PHONE jacks.
1-11. Items Comprising an Operable Equipment
g. Cord CD-307A. The headset extension cable is
The items comprising an operable equipment are
used to extend the Headset HS-216/U cord an additional
listed in table 1-1.
5 feet.
Dimensions (in.)
NSN
Qty
Item
Weight
Height
Width
Depth
(lb)
6625-00-892-5361
1
Frequency Meter FR-149(*)/USM-159
11-1/4
12-15/16
11-1/2
26
Consisting of:
6625-00-889-1279
1
Antenna AT-564(*)/U
12
1
Cord CG-409E/U
12
5935-00-930-7461
1
Adapter UG-641(*)/U
1
Headset H-216/U or HS-33
1
Cable Assembly, Power, Electrical
CX-7782/USM-159 or CX-
12005/USM-159
96
1
Cord CD-307A
60
1-3/(1-4 blank)
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