TM 11-6625-1559-12
division on Uhf ranges:
Uhf (wide) . . . . . . . . . ...500 kHz or less minimum;
Vhf narrow: 0 to 450 mc;
40% of center frequency or
Vhf wide: 0 to 460 mc;
more, maximum.
Uhf narrow: 340 to 1,200
Output voltage:
Vhf . . . . . . . . . . . . . . . . .. 0.25volt rms or more into
Unf wide: 275 to 1,100
50-ohm load.
mc.
Uhf . . . . . . . . . . . . . . . . .. 0.5volt rms or more into 50-
VOLTS meter . . . . . . . . . . . . Provides output voltage level
ohm load.
measurement accurate
Output voltage variation:
within 1 db from 0 to 400
Vhf . . . . . . . . . . . . . . . . .0.5 db at maximum sweep
MHz. For accuracy above
width
400 MHz see calibration
Uhf . . . . . . . . . . . . . . . . .0.5 db to 800 MHz and 1.5
curve, figure 1-2.
db from 800 to 1,200 Mhz at
Blanking . . . . . . . . . . . . . . . . . Return trace blanking is op-
maximum sweep width.
tional by means of panel
Output voltage variation
switch. Blanks to 0 voltage.
less at narrower sweep
Power source require-
widths.
ments . . . . . . . . . . . . . . . ...100 to 130, or 200 to 260
Spurious beats and
volts ac at 50 or 60 cycles.
harmonics . . . . . . . . . . . . . . 20 db or more below funda-
Power consumption . . . . . . . Approximately 100 watts.
mental output.
Impedance . . . . . . . . . . . . . ..50 ohms, nominal.
Detector . . . . . . . . . . . . . . . . . .Full-wave peak-to-peak feed
through type:
vswr less than 1.3:1 up to 900
MHz and less than 1.4:1 up to
1-6. Description of Equipment
1,200 MHz with a termina-
tion vswr is 1.05:1 or bet-
a. Generator, Signal Sweep SG-593/U. The sweep
ter.
generator is constructed of a welded aluminum
Horizontal frequency
frame which holds the RF components, the main
modulation . . . . . . . . . . . . Obtained from powerline fre-
quency, shaped to sinusoidal
chassis, and four removable chassis modules. It is
form.
surrounded by a heavy welded steel cabinet with a
Horizontal deflection
top cover, which is removable for maintenance.
voltage . . . . . . . . . . . . . . . ..20 volts, peak-to-peak.
The entire cabinet is removable for rack-mounting
Markers (internal) . . . . . . . . Crystal-controlled harmonic
of the unit. The operating controls and RF
markers at 1, 10, and 100
MHz intervals. Each mark-
OUTPUT jack are located on the front panel of the
er group output is individ-
unit. The removal model D-50 detector module is
ually controlled from the
also mounted on the front panel. Jacks for
front panel.
connecting auxiliary equipment (oscilloscope, etc)
Marker input
are located at the rear of the unit. The following
(external) . . . . . . . . . . . . . . . Requires 20 millivolts or
more. Gain of marker am-
removable chassis modules are mounted on the
plifier is variable from 0 to
main chassis (fig. 1-3):
100.
(1) Preamplifier and marker amplifier.
Oscilloscope preampli-
(2) Mixer and VHF-ALC detector.
fier . . . . . . . . . . . . . . . . . . . . . Gain variable from 2 to 200
(3) Harmonic marker generator.
(46 db). ac or dc coupling to
the oscilloscope input may
(4) ALC amplifier, blanking circuit and meter
be selected.
Amplifier.
Attenuator . . . . . . . . . . . . . . . Adjustable from 0 to 50 db in
b. Adapter-Connector UG-1640/U. The UG-
10-db increments.
1640/U provides correct impedance match for
Frequency dial . . . . . . . . Calibrated in four ranges
detector output.
with an accuracy of 1 dial
Fig.
Nomenclature, part No., and mfr code
QTY
FSN
No.
NOTE
The part number is followed by the applicable 5-digit Federal supply
code for manufacturers (FSCM) identified in SB 708-42 and used to
identify manufacturer, distributor, or Government agency, etc.
Generator, Sweep AN/USM-203: (This item is nonexpendable)
which includes:
Adapter, Grounding: 210, 82879
1
5935-00-838-5183
1
Connector, Plug, Electrical UG-1640/U
5935-00-500-9851
Dummy Load, Electrical DA-505/U
2
6625-00-070-7998
1
Generator, Sweep SG593/U: (This item is nonexpendable)
6625-00-935-8109
1
As measured at front panel DETECTOR jack.
Change 3
