OPERATION MANUAL
IFF-701Ti
1-2-2
Page 8
Jul 1/00
ITEM DESCRIPTION
18. 90/150 Hz VAR PHASE (φ) Switch
Varies the phase (
φ) of the 150 Hz
tone relative to the 90 Hz tone.
Normally, the 90 and 150 Hz tones,
used in Glide Slope and Localizer
simulations, are locked in phase
together. Adjusting the VOR BRG
SELECT Switches while pressing the
90/150 Hz VAR PHASE (
φ) Switch,
changes phase relationship. If the
VOR BRG SELECT Switches are set
to 000.0, pressing the 90/150 Hz VAR
PHASE (
φ) Switch produces no
change in phase. Each 1
° step
selected on the VOR BRG SELECT
Switches shifts the 150 Hz tone 5
°
relative to the 90 Hz tone. The
90 Hz tone always remains constant in
phase relative to the 000.0 set on the
VOR BRG SELECT Switches.
Setting the VOR BRG SELECT
Switches to 024.0 (24
° VOR bearing)
with the 90/150 Hz VAR PHASE (
φ)
Switch pressed puts the 90 and
150 Hz tones in original phase
relationship. Setting the VOR BRG
SELECT Switches to 012.0 (12
° VOR
bearing) with the 90/150 Hz VAR
PHASE (
φ) Switch pressed, places the
amplitude summation of the 90 and
150 Hz tones at maximum magnitude.
19. G/S CENTER Adjust
Varies the amplitude of the 90 Hz tone
and controls exact course centering
for Glide Slope modulation.
20. G/S VAR DDM Control
Continuously varies G/S pointer
deflection from counterclockwise
(ccw) 0.8 DDM (down) through
0 DDM to clockwise (cw) 0.8 DDM
(up). Setting the G/S DDM Control to
↓ activates the G/S VAR DDM Control.
ITEM DESCRIPTION
21. TONE SELECT Switch
Selects modulation input to the
internal Signal Generator or input to
the internal digital Counter:
● CTR IN connects the MOD IN/EXT
FREQ CTR IN Connector input to
the Counter, active with COUNTER
MODE Switch set to HZ, KHZ, KHZ
or MHZ.
● MOD IN applies the MOD IN/EXT
FREQ CTR IN Connector
modulation to the Signal
Generator.
● 1020 applies 1020 Hz modulation
to the frequency band (except G/S)
set by FREQUENCY MODE Switch.
● 400 applies 400 Hz modulation to
the frequency band (except G/S)
set by FREQUENCY MODE Switch.
● 1300 applies 1300 Hz modulation
to the frequency band (except G/S)
set by FREQUENCY MODE Switch.
● 3000 applies 3000 Hz modulation
to the frequency band (except G/S)
set by FREQUENCY MODE Switch.
22. MOD IN/EXT FREQ CTR IN Connector
Provides an input for external
modulation to the internal Signal
Generator or a 1 to 300 MHz signal to
the internal digital Counter as
selected by the TONE SELECT
Switch.
23. LOC CENTER Adjust
Varies the amplitude of the 90 Hz tone
and controls exact course centering
for Localizer modulation.
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