OPERATION MANUAL
IFF-701Ti
1-2-3
Page 2
Jul 1/00
3.5 BENCH OPERATION
Bench testing dictates the use of direct
coaxial cable connections between the
Test Set and UUT. The Attenuator Dial
readout is the RF level in dBm present at
the RF OUT Connector into 50
Ω. To
conduct accurate sensitivity
measurements, the loss in dBm of the
connecting coaxial cables must be known.
CAUTION: MOST COM RECEIVER
ANTENNA CONNECTORS
ARE ALSO USED FOR THE
COM TRANSMITTER
CONNECTOR. THE
TRANSMITTER SHOULD BE
KEYED ONLY WHEN THE
COM ANTENNA
CONNECTOR IS
DISCONNECTED FROM THE
TEST SET RF OUT
CONNECTOR. DAMAGE TO
THE ATTENUATOR AND
SIGNAL GENERATOR
SYSTEM MAY RESULT.
3.6 COUNTER OPERATION
With the TONE SELECT Switch in the
CTR IN position, the Test Set Counter
may be utilized as a general utility
Counter. Frequencies from 1 to 300 MHz
can be measured. The Counter Mode
Switch can be used in any of the four time
base positions: Hz, kHz, KHz or MHz.
3.7 BATTERY PARAMETERS
The battery permits completely portable
ramp operation for up to two hours.
In battery operation, an automatic timer
turns the Test Set OFF after 6 to
10 minutes. The Test Set can be
recycled by pressing the PWR/BAT Switch
to the BAT position.
With the MONITOR METER FUNCTION
switch in the BAT position, the MONITOR
meter 0 to 30% scale displays battery
voltage. Normal battery charged condition
is indicated as
≥15 V or greater. Battery
voltage <12.5 V indicates a discharged
battery. An automatic low voltage cutoff
circuit turns the Test Set OFF when the
battery voltage drops under 12.5 V.
NOTE: If the Test Set is used only for
bench operation, the battery can
lose storage ability. The Test Set
should be periodically operated on
battery power to allow the battery
to partially discharge.
3.8 OPERATE LOC AND G/S
SIMULTANEOUSLY
To operate the LOC and G/S outputs
simultaneously:
● Adjust all controls for normal G/S
operation (G/S FIXED mode, only).
The Output Attenuator varies the RF
level of the G/S signal, and G/S DDM
controls vary the DDM of the G/S
signal.
● Select LOC with the AVG/PEAK LOC
XMTR ON Switch to activate a
separate Localizer generator in the
Test Set. This generator output is
combined with the G/S output at the
RF Output Connector at the fixed level
of -18 dBm (approx.). LOC DDM
Controls vary the DDM of the Localizer
signal.
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