TM 11-6625-1559-12
Function
Control or indicator
POWER switch ------------- - - - - - - - - - - - - - - - - - - - - - - - - - - - - Applies and disconnects ac input power to sweep
generator.
SWEEP WIDTH switch ----- - - - - - - - - - - - - - - - - - - - - - - - - - - - - WIDE position provides 500 kHz to 400 MHz sweep of
center frequency.
NARROW position provides 10 kHz to 1 MHz sweep of
center frequency.
SWEEP WIDTH control -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Provides adjustment of sweep width within the range
selected by the SWEEP WIDTH switch.
PHASING TURN-BLANKING PULL control/switch ------- In position permits adjusting of return trace on
Out position blanks return trace.
MARKER GAIN PULL-TURN control:
1 MHz switch/control ------------------------------ In position disables 1-MHz markers. Out position
energizes 1-MHz markers and permits level adjustment.
10 MHz switch/control ------------------------------ In position disables 10-MHZ markers. Out position
energizes 10-MHZ markers and permits level adjustment
100 MHz switch/control -------------------------- In position disables 100-MHZ markers. Out position
energizes 100-MHZ markers and permits level adjust-
ment.
MASTER GAIN-PULL EXT MKR switch/control ----- In position permits adjustment of amplitude level of all
internal markers (1, 10, and 100 MHz) simultaneously.
Out position connects external markers into the sweep
generator, and permits adjustment level of all external
and internal markers simultaneously.
FIXED CSC FREQ (screwdriver adjustment) ------------- Provides fine adjustment to set vhf oscillator frequency
at 600 MHz so that harmonic markers are accurate.
PREAMPLIFIER controls:
BALANCE dual potentiometer (control knob and
Permits adjustment of dc reference level of preamplifier
screwdriver adjustment accessible through center
output so that it is unaffected by the setting of the
of control knob).
GAIN control. Screwdriver adjustment provides coarse
control; knob provides fine control.
GAIN control -------------------------------------- Adjusts preamplifier output voltage amplitude,
DC LEVEL control ---------------------------------- Sets dc reference level on external oscilloscope (0 dc at
zero rf level).
AC-DC switch -------------------------------------- AC position provides ac coupling of preamplifier output
to external oscilloscope.
DC position provides dc coupling of preamplifier output
to external oscilloscope.
WOBB DRIVE LIMIT potentiometer-screwdriver
Protects wobbulator unit by limiting voltage applied to it.
Accessible by opening top lid of cabinet.
Input power switch (230V-115V switch bottom of main
Permits operation from either 230 or 115 volts ac input
power.
(4) Testing radiofrequency amplifiers (para
3-9).
(5) Testing an individual amplifier stage
be used for different applications where band-
pass response or characteristics are required to
(6) Testing frequency response and meas-
be measured. Some of the most common appli-
cations of the sweep generator and oscilloscope
3-11).
are-
(1) Measuring the bandpass of a receiver
(2) Measuring the bandpass of the RF sec-
tion of a receiver (para 3-7).
b. For any type of operation, perform the
(3) Measuring the bandpass of the inter-
following procedures: