OPERATION MANUAL
IFF-701Ti
1-2-2
Page 5
Jul 1/00
ITEM DESCRIPTION
5. FREQUENCY MODE Switch
Selects frequency band to be used:
Marker (MKR), VOR, Localizer (LOC),
Glide Slope (G/S) or COMM. Each
band except COM has two positions;
one with a fixed frequency (FIXED)
and the other with a variable
frequency (VAR). The COM band has
three positions; one with a fixed
frequency (FIXED) and two with
variable frequencies (COM 25kHz and
COM 8.33kHz).
6. G/S DDM Control
Selects amount of G/S pointer
deviation of an ILS Indicator under
test. Calibrations in DDM represent
standard deflection (.091), full scale
(.175) and greater than full scale
deflections (.400). Clockwise rotation
provides upward deflection.
The 90 ~ or 150 ~ position deletes the
opposite tone (150 or 90 Hz) and sets
the selected tone (90 or
150 Hz) to the same level as the on
course value (40%) for a flag test.
NOTE: Setting the LOC DDM Control
to the same 90 ~ or 150 ~
position when using the Glide
Slope function deletes the
selected Glide Slope tone.
Setting the G/S DDM Control to 90 ~
and the LOC DDM Control to 150 ~ or
vice versa provides continuous wave
(CW) operation.
The
↓ position allows the G/S VAR
DDM Control to set continuously
deviated deflection.
ITEM DESCRIPTION
7. CRYSTAL HI/LO Switch
Selects high (HI) or low (LO) fixed
frequencies in G/S FIXED or VOR
FIXED modes as selected by the
FREQUENCY MODE Switch. The
CRYSTAL HI/LO Switch also applies
modulation to the appropriate
Localizer Transmitter frequency when
FREQUENCY MODE Switch is set to
G/S FIXED. The Test Set pairs
Localizer Transmitter frequencies with
G/S fixed frequencies when
AVG/PEAK LOC XMTR ON Switch is
set to PEAK LOC.
8. COUNTER MODE Switch
Selects signal source to be counted
and shown on the DIGITAL Display:
● GEN measures and display
internal Signal Generator
frequency.
● HZ (1 Hz resolution), kHZ (10 Hz
resolution), KHZ (100 Hz
resolution) and MHZ (1 kHz
resolution) measures and displays
COM Transmitter frequency
connected to COM XMTR IN
Connector or external signal
frequency connected to MOD
IN/EXT FREQ CTR IN Connector.
● BRG measures and displays digital
bearing circuit output to verify
bearing set by VOR BRG SELECT
Switches. In the BRG position,
the bearing monitor circuits also
check VOR modulation for correct
operation at 90
°.
9. METER BEARING CENTER Adjust
Used to center the MONITOR Meter
when the MONITOR METER
FUNCTION Switch is set to BRG and
the COUNTER MODE Switch is set to
any position except
BRG. The
METER BEARING CENTER Adjust
sets a reference level in the internal
bearing check operation.
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