TM 11-6625-214-12
DELAYED SYNC OUT connector and outside equipment if
control and OUTPUT ATTEN. control determines the fre-
a syn- chronizing pulse simultaneous with start of rf pulse
quency of the rf output of the signal generator and the
is desired.
d. Obtaining Internally Modulated Pulsed Rf
output in decibels below 1 milliwatt (dbm) (0.228 volt)
Out- put, Delayed.
when working into the rated load of 52 ohms.
(4) The individual settings of other operating
(1) Adjust all controls to positions described
controls are of no importance.
m paragraph 35c, except, PULSE DELAY control which is
set to position indicating desired delay, in microseconds,
NOTE
as read on the calibrated dial. This setting can be made to
For a given setting of the output attenuator dial,
provide a delay from 3 to 300 microseconds after leading
the indicated peak voltage of the rf output under
edge of SYNC OUT pulse.
conditions other than cw will be within _ 1 decibel
(2) If external synchronization is employed,
of that for cw operation.
con- nect to SYNC IN connector, a synchronizing voltage
(5) If the radio frequency is changed it will
source of proper type and polarity, and of 5 to 50 volts
be necessary at each new frequency to follow the adjust-
amplitude. When synchronized by external equipment, the
signal generator provides at SYNC OUT connector a pulse
accuracy of the output attenuator dial is desired. If full
which occurs simultaneously with leading edge of pulse
accuracy of the output attenuator dial is not required, it
applied to SYNC IN connector.
may not be necessary to recalibrate at frequencies close
(3) Attach one of the video cords between
SYNC OUT connector and external equipment, if desired.
(6) Connect rf cable between RF OUTPUT
(4) Connect the remaining video cord
con- nector on signal generator and load.
between DELAYED SYNC OUT connector and external
b. Obtaining Internally Modulated Square Wave
equipment to provide a synchronizing pulse occuring
Output.
simultaneously with the start of the pulse of radiofre-
(1) Set MOD SELECTOR switch to SQ
quency energy.
WAVE.
(5) Connect rf cable between RF OUTPUT
(2) Set SYNC SELECTOR switch to
con- nector and external load.
X1/PPS MUX 2 or X10/PPS MUX 10 position as
e. Internal Frequency Modulation. Note that the
necessary to obtain desired repetition rate.
characteristics of the klystron 'do not lend themselves to
(3) Set PULSE RATE control to desired
linear frequency deviation by a linear voltage excursion
pulse repetition rate.
applied to the repeller; therefore, the resulting frequency
(4) The PULSE WIDTH control and the
modulation is only an approximate representation of a
PULSE DELAY control do not affect SQ WAVE operation.
sawtooth, and is accompanied by discernible amplitude
(5) Connect if cable between RF OUTPUT
modulation. For internal frequency modulation (sawtooth),
con- nector on signal generator load.
proceed as follows.
(6) A sync pulse is available at SYNC OUT
(1) Set MOD SELECTOR switch to INT FM.
con- nector for each cycle of square wave.
(2) Set SYNC SELECTOR switch to
c. Obtaining Internally Modulated Pulsed Rf
X1/PPS MUX 1 or X1O/PPS MUX 10 position as required
Out- put, No Delay.
to establish setting of PULSE RATE control.
(1) Set MOD SELECTOR switch to INT.
(3) Set PULSE RATE control to desired
(2) Set SYNC SELECTOR switch to position
position so that the calibrated dial indicates pulse
for type of synchronization desired.
repetition frequency, as read on PULSE RATE control
(3) If internal synchronization is employed,
multiplied by the position indicated on SYNC SELECTOR
set PULSE RATE control to desired repetition rate, con-
switch, either the direct reading, or the reading multiplied
sidering the setting of SYNC SELECTOR switch X1/PPE
by 10.
MUX 1 or X10/PPS MUX 10 position.
(4) From the counterclockwise, OFF,
(4) If external synchronization is employed,
position,
slowly turn the FM AMPLITUDE control
con- nect to SYNC. In connector, a synchronizing voltage
clockwise to the desired frequency deviation. Because of
source of 5 to 50 volts amplitude, and of type and polarity
the characteristics of the klystron, the frequency deviation
indicated by SYNC SELECTOR switch. When
should be adjusted so it will not exceed the limits of
synchronized by external equipment, the signal generator
operation of the klystron which would result in instability. If
provides at SYNC. OUT connector a pulse which occurs
unstable operation occurs, return the FM AMPLITUDE
simultaneously with the leading edge of the pulse applied
control to the OFF position, and slowly rotate clockwise to
to the SYNC IN connector.
a point just short of where instability occurred.
(5) Set PULSE WIDTH control to desired
(5) Connect rf cable between RF OUTPUT
posi- tion between 0 5 and 10 microseconds.
connector on signal generator and load.
(6) Connect rf cable between RF OUTPUT
con- nector on signal generator and load.
(7) Connect a video cord between
3-7
TM 11-6625-214-12