TM
11-6625-622-12
Section Il. OPERATING INSTRUCTIONS
- u n i t controls, indicators, and connectors and
2-3. Operating Controls, Indicators,
indicate their functions.
and Connectors
The charts in a through b below list the test
Function
Control, indicator or connector
Connects voltages for the type of transceiver under test to
618T-2-OFF-618T-3 switch (3-position toggle)
the proper test unit jack.
Caution: Be sure switch is in 618T-3 position or
receiver-transmitter will be damaged.
Action
Switch position
Not used.
618T-2
Not used.
OFF
Connects voltages for the re-
618T-3
ceiver-transmitter to the mul-
tiple pin connector
on top panel.
Indicates the transmitter rf output in watts, forward or
RF OUTPUT meter
reflected.
Connects the appropriate power range and direction of rf
WATTS REFLECTED-FORWARD switch (4-position
to the RF OUTPUT meter.
rotary)
Switch position
Action
REFLECTED:
RF OUTPUT meter will read
200
200 watts of reflected rf at
full scale.
2000
RF OUTPUT meter will read 2
kilowatts of reflected rf at
full scale.
FORWARD:
RF OUTPUT meter will read
200
200 watts of forward rf at
full scale.
RF OUTPUT meter will read 2
2000
kilowatts of forward rf at full
scale.
Grounds the receiver-transmitter tune powerline to check
TUNE POWER switch (push-button)
the function of the tune circuitry within the receiver-
Note: To avoid damage
to
receiver-transmitter,
do
not
depress
for
transmitter. Is not used with antenna couplers.
more than 15 seconds.
Provides remote keying of the transmitter section of the
KEY switch (3-position toggle)
receiver-transmitter in the USB, LSB, and AM positions
of mode selector switch control unit.
Action
Switch position
Provides continuous keying of
On (up)
the transmitter by grounding
the usb, lsb, and AM keying
circuits.
Removes the ground from the
Off (center)
transmitter keying circuit.
Spring-loaded position which
Momentary on (down)
provides keying of the trans-
mitter by grounding the key-
ing circuit when the switch is
held down.
