IFR NAVAIR NAV-750 User manual

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TECHNICAL MANUAL
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INSTRUMENT CALIBRATION PROCEDURE
VOR/LOCICOMM AND G/S
BENCH TEST SETS
IFR INC.
NAV-750, NAV-750A, AND NAV-750B
DISTRIBUTION WITHIN GIDEP IS AUTHORIZED BY
NAVAL WEAPONS STATION, SEAL BEACH LETTER,
SER 313/0994 DATED 14 MAY 1987
THIS PUBLICATION SUPERSEDES NAVAIR 17—2OAX—737
DATED 1 JULY 1991
DISTRIBUTION STATEMENT C. DISTRIBUTION AUTHORIZED TO U.S. GOVERNMENT AGENCIES
AND THEIR CONTRACTORS TO PROTECT PUBLICATIONS REQUIRED FOR OFFICIAL USE OR FOR
ADMINISTRATIVE OROPERATIONAL PURPOSES ONLY. OTHER REQUESTS FOR THIS DOCUMENT
SHALL BE REFERRED TO NAVY MEASUREMENT SCIENCEDIRECTORATE, NAVAL WARFARE
ASSESSMENT DIVISION, P0. BOX 5000 CORONA. CA 91718-5000
DESTRUCTION NOTICE- FORUNCLASSIFIED, LIMITED DOCUMENTS, DESTROY BY ANY
METHOD THAT WILL PREVENTDISCLOSURE OF CONTENTS OR “RECONSTRUCTION OF
THE DOCUMENT”
PUBLISHED BY DIRECTION OF COMMANDER NAVAL AIR SYSTEMS COMMAND
1 AUGUST 1995
[BUL This document has been modified primarily
for the purpose of incorporating changes
[SION previously identified in the Metrology Bulletin
(METBUL) as unpublished procedure
[‘ICE changes.
NAVAIR 17-2OAX-737

Section
3
4
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
4.10
4.11
4.12
4.13
4.14
4.15
TABLE OF CONTENTS
NAVAIR 17—2OAX—737
Page
1
4
6
7
7
8
9
10
11
14
15
18
18
19
20
20
22
24
27
29
1
Introduction and Description
Equipment Requirements
Preliminary Operations
Calibration Process
Frequency Accuracy Tests
Attenuator FrequencyResponse Tests
Attenuator Line aritv Tests
DEMOD Tones and DC OFFSET Tests
Tone Frequency Tests
Tone Distortion Tests
Percent Amplitude Modulation ofTones and ModulationMeter Tests
RF Level Meter Tests
VOR Bearing Tests
LOC Centering Test
GIS Centering Test
Spectral Purity Tests (NAV—750 only)
Spectral Purity Tests (NAV—750A only)
Spectral Purity Tests (NAV—750B only)
Residual FM Tests
Navy Calibration Checklist
ILLUSTRATIONS
Page
FM Deviation Display 12
9960 Hz Deviation (Expanded) 13
TABLES
Page
Calibration Description
Figure
1
2
Table
1

NAVAIR 17—2OAX—737
SECTION 1
INTRODUCTIONAND DESCRIPTION
1.1 This procedure describes the calibration of IFR Inc. NAV—750, NAV—750A, NAV—750B
VOR/LOC/COMM and G/S Bench Test Sets. The instrument being calibrated is referred to herein as the
TI (Test Instrument).
1.2 This procedure wasderived from draft prepared by NADEP Cherry Point. All comments concerning
this procedure should be directed to Navy Measurement Science Directorate, Naval Warfare Assessment
Division, P.O. Box 5000, Corona, CA 91718—5000.
1.3 This procedure includes tests of essentialperformance parameters only. Any malfunctionnoticed
duringcalibration, whether specifically tested for or not, should be corrected.
DEMOD tones
DC offset
Frequency range: 108.000 to
335.000 MI-Iz; (70.000 to 79.000,
NAV—750B only)
Tolerance: ±1 ppm
Range: 70.0 MHz to 335.0 MHz
Tolerance: ±1.5 dB @ —6 dBm to
-50 dBm; ±2.5 dB @ -51 dBm to
—120 dBm
Range: —6 to —50 dBm
Tolerance: ±1.5 dB
Range: —51 to —120 dBm
Tolerance: ±2.5 dB
Tone frequencies: 30, 90, 150,
1020, and 9960 Hz
DC offset: +40 mV to —40 mV dc
Tone Frequencies: 400, 1300, and
3000 Hz
DC offset: +80 mV to —80 mV dc
Tone frequencies: 30, 90, 150, and
9960 Hz
Tolerance: ±0.02%
Tone frequency: 1020 Hz
Tolerance: ±0.5%
Tone frequencies: 400, 1300, and
3000 Hz
Tolerance: ±0.7%
Tone frequencies: 90 and 150 Hz
Tolerance: ±0.4%
Tone frequencies: 30 and 1020 Hz
Tolerance: ±0.5%
Tone frequencies: 400, 1300,
and 3000 Hz
Tolerance: ±0.7%
Measured with an electronic
counter.
Attenuatoroutput monitored
by a power meter while the
frequency is verified.
Attenuatoroutput measured
with a signal analyzer.
Offset measured using a
digital multimeter.
Measured with an electronic
counter.
Table 1. Calibration Description
TI
Characteristics
Performance
Specifications
Test
Method
Frequency accuracy
Attenuator frequency
response
Attenuator linearity
Tone frequency
Tone distortion
Measured with a signal
analyzer.
1

NAVAIR 11—2OAX—737
Harmonic spurious
noise
VOR 30 Hz: 20% AM
Tolerance: ±1.2%
VOR 9960 Hz: 30% AM
Tolerance: ±1.2%
LOC 90 Hz: 20% AM
Tolerance: ±0.8%
LOC 150 Hz: 20% AM
Tolerance: ±0.8%
G/S 90 Hz: 40% AM
Tolerance: ±1.6%
G/S 150 Hz: 40% AM
Tolerance: ±1.6%
Comm 1020 Hz: 30% AM
Tolerance: ±1.2%
Range: 0 to 30% AM
Tolerance: @ 20%,
±0.8%; @ 30%, ±1.2%
Range: 0 to 100% AM
Tolerance: @ 40%,
±1.6%; @ 95%, ±3.0%
Frequency range:
108.000 to 335.000 MHz;
(70.000 to 79.000 MHz,
NAV—750B only)
Tolerance: ±1.5 needle widths
Bearing range: 00 to 360°
Tolerance: ±0.05%
Tone frequencies: 90 and 150 Hz
Tolerance: ±2.75 mV
>30 dBc from 108.000
to 335.000 MHz; (>20 dBc
from 70.000 to 79.000 MHz,
NAV—750B only)
NAV—750 only
Frequency: 108.000 MHz
Tolerance: >68 dB below carrier @
±12.5 kHz, and ~71 dB below
carrier ~ ±25.0 kHz in 300 Hz
resolution bandwidth
Frequency: 334.700 MHz
Tolerance: ~63 dB below carrier @
±12.5 kHz, and 74 dB below
carrier @ ±15.0 kHz in 300 Hz
resolutionbandwidth
Modulation meter indication
is compared to signal
generator calibrator
indication.
Frequency varied and meter
monitored for deflection.
Compared to a bearing
standard.
Measured with a digital
multimeter.
Measured with a spectrum
analyzer.
Measured with a spectrum
analyzer.
TI
Characteristics
Performance
Specifications
Test
Method
Measured with a signal
analyzer.
Tone modulation
Modulation meter
Meter RF level
Bearing
LOC-G/S
Harmonics
2

NAVAIR 17—2OAX—737
Frequency: 108.000 MHz
Tolerance: 75 dB
below carrier @ ±12.5 kHz,
and ~83 dB below carrier
@ ±25.0 kHz in 300 Hz
resolutionbandwidth
NAV-750Aonly
Frequency: 334.700 MHz
Tolerance: 66 dB
below carrier @ ±12.5 kHz,
and 77 dB below carrier
@ ±25.0 kHz in 300 Hz
resolutionbandwidth
NAV—750B only
Frequency: 334.700 MHz
Tolerance: >75 dB
below carrier @ ±12.5 kHz,
and ~83 dB below carrier
@ ±25.0 kHz in 300 Hz
resolution bandwidth
NAV—750 only
Frequency: 108.000 MHz
Tolerance: 14 dB
below carrier @ ±20 kHz
in 300 Hz resolutionbandwidth
Frequency: 334.700 MHz
Tolerance: 68 dB
below carrier @ ±20 kHz
in 300 Hz resolutionbandwidth
NAV-750A and NAV-750B
Frequency: 108.000 MHz
Tolerance: ~78 dB
below carrier @ ±15 kHz
in 300 Hz resolution bandwidth
Frequency: 334.700 MHz
Tolerance: >74 dB
below carrier @ ±20 kHz
in 300 Hz resolutionbandwidth
NAV-750Aonly
Frequency: 130.000 MHz
Tolerance: .78 dB
below carrier @ ±15 kHz
in 300 Hz resolutionbandwidth
NAV-750and NAV-750B
Frequency: 108.000 MHz
Tolerance: ~80 dB
below carrier @ ±100 kHz
in 1 kHz resolutionbandwidth
TI
Characteristics
Performance
Specifications
Test
Method
NAV-750A and NAV-750B
Single—sideband noise
Broadband noise
Measured with a spectrum
analyzer.
Measured with a spectrum
analyzer.
3

NAVAIR 17—2OAX—737
TI
Characteristics
Performance
Specifications
Test
Method
NAV-750 and NAV-750B
Frequency: 334.000 MHz
Tolerance: >80 dB
below carrier @ ±100 kHz
in 1 kHz resolutionbandwidth
NAV—750A only
Frequency: 108.000 MHz
Tolerance: >82dB
below carrier @ ±100 kHz
in 1 kHz resolutionbandwidth
Frequency: 334.000 MHz
Tolerance: >82 dB
below carrier @ ±100 kHz
in 1 kHz resolutionbandwidth
Residual FM Frequency: 108.000 MHz
Residual FM: ~200 Hz
Frequency: 334.700 MHz
Residual FM: ~.400 Hz
Measured with a signal
generator
RF Type N Centerconnector depthrange:
Measured using a connector
connector dimensions 0.197 inch
Tolerance: ±0.01 inch
(MIL—C—71B)
gage kit
SECTION 2
EQUIPMENT REQUIREMENTS
NOTE
Minimum use specifications are the principal parameters requiredfor performance of the
calibration, and are included to assist in the selection of alternateequipment, which maybe
used at the discretion ofthe using laboratory. Satisfactory performance of alternate items
shall be verified prior to use. All applicable equipment must bear evidence of current
calibration.
Theinstruments utilized in this procedure were selected from those known to be available
at Navy calibration facilities, and the listing by make or model number carries no
implication of preference, recommendation, or approvalfor use by other agencies. It is
recognized that equivalentequipmentproduced by other manufacturers may be capable of
equally satisfactory performance in this procedure.
I
4

NAVAIR 17—2OAX—737
2.2 Electronic
counter
2.3 Digital multimeter
(DMM)
2.4 Power
meter/power
sensor
2.5 Signal generator
calibrator
2.7 Navigation
indicator T/S
2.8 Spectrum
analyzer
2.9 Connector
gage kit
*Non_NCE equipment
Bandwidth: 50 MHz
Uncertainty: ±3% timebase
Dualtrace and delayed
sweep capability
Frequency range: 25 Hz to 335 MHz
Uncertainty: ±0.25 ppm
Resolution: 1 Hz
DC voltage range: 0 to ±80 mV dc
Uncertainty: ±1%
Powerrange: —25 to —35 dBm
Uncertainty: ±1.25%
Frequency range: 70 to 335 MHz
Frequency range: 108 to 118 MHz
Tuned RF level rang: e—6 to —100 dBm
Uncertainty: ±0.35 dB
AM modulation range: 15% to
100% AM
Uncertainty: ±1% AM
FM modulation range: <200 Hz to
400 Hz FM
Uncertainty: ±2%
Capable of measuringdistortion down to
0.1% with 0.01% resolution
No known substitute
Range: 50 MHz to 1.2 GHz
Resolution: 300 Hz mm
Dynamic range: >85 dB
Range: 0 to 0.197 inch
Uncertainty: ±0.0025 inch
(MIL—C--71B)
Tektronix
7704AM0D 1 29GOPTO3,
7904AOPT03 or
7704AM0D129G with
7A26 and 7B92A plug—ins
Hewlett—Packard
5335A0PT010, 030, 040,
5345A0PT012, or 5345A
Fluke 8SO6AAN, 8502AAT,
or 884OAAFOPTO5
Hewlett—Packard
436A0PT022, 436A, or
435A with 8484A
Hewlett—Packard
8902A0PTE02 (consists
of: H-P 8902A0PT002;
and H—P 11722A) or
8902A0PTE04 (consists
of: H—P8902A;
H—P 8672AOPT001, 008;
H—P 11792A0PT001,H04;
and H—P 1 1793A0PTH04)
Sound Technology
1700BOPTOO3, 005; or
Hewlett—Packard
8903B0PT050, 907, 910,
or 8903BOPT907
Collins 478A—3 ZIFOR 111*
Hewlett—Packard
8562A0PTE50,
8569BOPT001, or 8566B
Maury Microwave
AOO7B, AOO7A
2.1 Oscilloscope
Item Minimum Use
Specifications
Calibration
Equipment
2.6 Distortion
analyzer
5

NAVAIR 17—2OAX--737
SECTION 3
PRELIMINARY OPERATIONS
3.1 Ensure that all power switches are set to off, and set all auxiliary equipment controls as necessary to
avoid damage to the equipment and so that dangerous voltages will not be present on output terminals
when the power switches are turned on.
3.2 Connect the auxiliary equipment, and theTI, to theappropriatepower source.
3.3 Verify that the TI panel meter indicateszero. If the TI meter does not indicate zero, adjustthe TI
meter mechanical screw adjustment for a zero scale indication. (Perform adjustment only after TI has been
off for at least 30 minutes.)
3.4 Setthe TI controls as follows:
TO—FROM bearing switch to
Meter function switch to
MASTER MOD control to
1020 Hz indent tone MOD control to
9960 Hz FM tone MOD control to
30 Hz tone MOD control to
.01—.05 degree bearing switch to
LOC DDM switch to
LOC variable DDM control to
LOC—GIS frequency switch to
G/S DDM switch to
G/S variable DDM control to
FREQUENCY MHz switches to
Channeling frequencyincrement switch to
AUTO-MANUAL switch to
CHANNELING rate control to
~F control to
BEARING—FREQ display select switch to
Attenuator control to
FROM
0—100 or OFF
CAL (UNCAL lamp off)
CAL (UNCAL lamp off)
CAL (UNCAL lamp off)
CAL (UNCAL lamp off)
.01
0
0
LOC
0
0
108.000
25 kHz
MANUAL
fully ccw
fully ccw
FREQ
-3OdBm
3.5 Turn all power switches on, and allow a sufficient warm—up time forthe equipment (the TI requires a
1 hour warm—up time).
3.6 Using connector gage kit (item 2.9), ensure the TI RF connector complies with specifications of
MIL—C—71B.
6

NAVAIR 17—2OAX—737
SECTION 4
CALIBRATION PROCESS
NOTE
Unless otherwise specified, verify the results of each test and take corrective action
whenever the test requirement is not met,before proceeding.
4.1 FREQUENCY ACCURACY TESTS
4.1.1 Set the TI controls as follows:
FREQUENCY MHz switches to 108.000
MASTER MOD control to UNCAL [fully ccw (0)]
Output attenuator control to —20 dBm
4.1.2 Ensure that the TI 0 LOCK indicator is on.
4.1.3 Connect the electronic counter to the TI RF output connector,and set the electronic counter for
frequency measurements, as necessary.
4.1.4 Adjust the TI output attenuator control, if necessary, to obtain a stable electronic counter
indication. (Repeat this step, if necessary, for the following tests of the TI frequency accuracy.)
4.1.5 Verify that the electronic counter indicates between 107.999892 and 108.000108 MHz.
4.1.6 Set the TI FREQUENCY MHz switches to 130.000, and verify that the electronic counter indicates
between 129.999870 and 130.000130 MHz.
4.1.7 Setthe TI FREQUENCY MHz switches to 157.000, and verify that the electronic counter indicates
between 156.999843 and 157.000157 MHz.
4.1.8 Set the TI FREQUENCY MHz switches to 328.000, and verify that the electronic counter indicates
between 327.999672 and 328.000328 MHz.
4.1.9 Set the TI FREQUENCY MHz switches to 335.000, and verify that the electronic counter indicates
between 334.999665 and 335.000335 MHz.
4.1.10 If the TI is a NAV—750B, proceed with step 4.1.11. Otherwise, if the TI is not a NAV—750B, skip
to step 4.1.13.
4.1.11 Set the TI FREQUENCY MHz switches to 070.000, and verify that the electronic counter indicates
between 69.999930 and 70.000070 MHz.
4.1.12 Set the TI FREQUENCY MHz switches to 079.000, and verify that the electronic counter indicates
between 78.999921 and 79.000079 MHz.
4.1.13 Disconnect the electronic counter from theTI.
7

NAVAIR 17—2OAX—737
4.2 ATI’ENUATOR FREQUENCY RESPONSE TESTS
4.2.1 Connect the power sensor to the powermeter. Zero and reference calibrate the power sensorand
powermeter.
4.2.2 Set the TI attenuator to —30 dBm. and the TI frequency switches to 108 MHz. Connect the power sensor input to the TI RF output connector.
4.2.3 Set the power meter controls for auto ranging or —25 dBm range, as applicable.
NOTE
For that following tests, set the power meter calibration factor switch to the appropriate
setting corresponding to the power sensor cal chart at the test frequency
(TI FREQUENCY MHz switchessetting).
4.2.4 Verify that thepowermeter indicates between —28.5 and—31.5 dBm.
4.2.5 Setthe TI FREQUENCY MHz switches to the followingsettings. At each setting, verify that the
power meter indicates within the tolerance limits listed.
TI
FREQUENCY MHz
Switch Setting
Power Meter
Tolerance Limits
(dBm)
115.000
125.000
135.000
145.000
157.000
—28.5 to —31.5
“
“
“
“
4.2.6 Setthe TI FREQUENCY MHz switches to 328.000.
4.2.7 Verify that the TI G/S Mode indicator is on, and that thepowermeter indicates between —28.5 and
—31.5 dBm.
4.2.8 Set the TI FREQUENCY MHz switches to the following settings. At each setting, verify that the
power meter indicates within the tolerance limitslisted.
TI
FREQUENCY MHz
Switch Setting
Power Meter
Tolerance Limits
(dBm)
330.000
332.000
335.000
—28.5 to —31.5
“
“
4.2.9 If the TI is a NAV—750B continue with step 4.2.10. Otherwise, if the TI is not a NAV—750B,
proceed to step 4.2.13.
4.2.10 Set the TI FREQUENCY MHz switches to 70.000.
4.2.11 Verify that thepowermeter indicates between —28.5 to —31.5 dBm.
8

NAVAIR 17—2OAX—737
4.2.12 Setthe TI FREQUENCY MHz switches to the followingsettings. At each setting, verify that the
power meter indicates within thetolerance limits listed.
TI
FREQUENCY MHz
Switch Setting
Power Meter
Tolerance Limits
(dBm)
072.000
074.000
076.000
079.000
—28.5 to —31.5
“
“
“
4.2.13 Disconnect thepower sensor from the TI.
4.3 ATTENUATOR LINEARITY TESTS
4.3.1 Set the TI controls as follows:
FREQUENCY MHz switches to
MASTER MOD control to
108.000 MHz
UNCAL [fully ccw (0)]
Output attenuator control to -6 dBm
4.3.2 Connect the signal generator calibratorsensor module input to the TI RF output connector.
4.3.3 Press the signal generator calibratorINSTR PRESET key (Blue key, AUTOMATIC OPERATION
key), and ensure that the signal generator calibrator is in the FREQ measurement mode and tunes to the TI
FREQUENCY MHz switches setting. Setthe signal generatorcalibrator for TUNED RF LEVEL
measurements with log (dBm) display, enter 39.9 SPCL, and then press the CALIBRATE key.
4.3.4 Set the TI outputattenuator control to each of the followingsettings. At each setting, verify that the
signal generator calibrator indicates within thetolerance limits listed.
TI Output Attenuator
Control Setting
Signal Generator Calibrator
Tolerance Limits
(dBm)
—6
—4.5 to —7.5
—10
—8.5 to —11.5
—20
—18.5 to —21.5
—30 —28.5 to —31.5
—40 —38.5 to —41.5
—50 —48.5 to —51.5
—60 —57.5 to —62.5
—70 —67.5 to —72.5
—80
—77.5 to —82.5
—90 —87.5 to —92.5
—100
—97.5 to —102.5
4.3.5 Disconnect the signal generator calibratorsensor module from theTI.
9

NAVAIR 17—2OAX—737
4.4 DEMOD TONES AND DC OFFSET TESTS
4.4.1 Set the TI controls as follows:
BEARING-FREQ switch to FREQ
MASTER MOD control to CAL (UNCAL lamp off)
1020 Hz indent tone MOD control to CAL (UNCAL lamp off)
9960 Hz FM tone MOD control to CAL (UNCAL lamp off)
30 Hz tone MOD control to CAL (UNCAL lamp off)
LOC DDM switch to 0
G/S DDM switch to 0
4.4.2 Connect the oscilloscope vertical amplifierinput to the TI rear panel DEMOD jack. Connect the
DMM voltage input to the TI rear panel TONES jack.
4.4.3 Set the TI oscilloscope and DMM controls as necessary to measure the TI signals in the following
steps:
4.4.3.1 Setthe TI FREQUENCY MHz switches to 108.100 MHz. Ensure that the TI frequency display
indicates 108.100, and the LOC mode indicator is on.
4.4.3.2 Set the TI G/S DDM switch to 90 Hz, and ensure that the 150 Hz tone offindicator ison.
4.4.3.3 Verify that the oscilloscope displays a 90 Hz tone, and that the DMM indicates between —40.0 and
+40.0 mV dc.
4.4.3.4 Set the TI LOC—G/S frequency switch to G/S.
4.4.3.5 Ensure that the TI frequency display indicates 334.700, and the G/S mode indicator is on.
4.4.3.6 Verify that the oscilloscope displays a 90 Hz tone, and that the DMM indicates between —40.0 and
+40.0 mV dc.
4.4.3.7 Set the TI G/S DDM switch to 150 Hz, and then ensure that the 90 Hz tone offindicator is on.
4.4.3.8 Verify that the oscilloscope displays a 150 Hz tone, and that the DMM indicates between —40 to
÷4OmVdc.
4.4.3.9 Set the TI LOC—G/S frequency switch to LOC.
4.4.3.10 Ensure that the TI frequency display indicates 108.100, the 90Hz tone offindicator is on, and the
LOC mode indicator is on.
4.4.3.11 Verify that the oscilloscope displays a 150 Hz tone, and that the DMM indicates between —40 to
+4OmVdc.
4.4.3.12 Set the TI G/S DDM switch to 0, and the FREQUENCY MHz switches to 108.000.
4.4.3.13 Ensure that the TI VOR mode indicator is on.
4.4.3.14 Verify that the oscilloscope displays a 9960 Hz tone, and that the tone is both frequency and
amplitudemodulated with a 30 Hz tone.
10

NAVAIR 17—2OAX—737
4.4.3.15 Verify that the DMM indicates between —40.0 and + 40.0 mV dc.
4.4.3.16 Adjust the TI 9960 FM tone modulation controltoUNCAL [fully ccw (0)].
4.4.3.17 Verify that the oscilloscope displays a 30 Hz tone, and that the DMM indicates between —40.0
and +40.0 mV dc.
4.4.3.18 Set the TI 9960 Hz tone modulation control to the CAL (UNCAL lamp off) position, and set the
FREQUENCY MHz switches to 118.000.
4.4.3.19 Verify that the oscilloscope displays a 1020 Hz tone, and that the DMM indicates —40.0 to
+40.0 mV dc.
4.4.3.20 If the TI is a NAV—750B continue with step 4.4.3.21. Otherwise, if the TI is not a NAV—750B,
proceed to step 4.4.3.27.
4.4.3.2 1 Set the TI meter function and toneselector switch to 400 Hz.
4.4.3.22 Verify that the oscilloscope displays a 400 Hz tone, and that the DMM indicates between —80.0 to
+ 80.0 mV dc.
4.4.3.23 Set the TI meter function and tone selector switch to 1300 Hz.
4.4.3.24 Verify that the oscilloscope displays a 1300 Hz tone, and that the DMM indicates between —80.0
and + 80.0 mV dc.
4.4.3.25 Set the TI meter function and tone selector switch to 3000 Hz.
4.4.3.26 Verify that the oscilloscope displays a 3000 Hz tone, and that the DMM indicates between —80.0
to +80.0 mV dc.
4.4.3.27 Disconnect the oscilloscope and the digital multimeter from the TI.
4.5 TONE FREQUENCY TESTS
4.5.1 Setthe TI controls as follows:
FREQUENCY MHz switches to 108.000
LOC—G/S frequency switch to LOC
BEARING-FREQ switch to FREQ
MASTER MOD control to CAL (UNCAL lamp off)
1020 Hz indent tone MOD control to CAL (UNCAL lamp off)
9960 Hz FM tone MOD control to CAL (UNCAL lamp off)
30 Hz tone MOD control to CAL (UNCAL lamp off)
LOC DDM switch to 0
G/S DDM switch to 0
4.5.2 Connect the electronic counter, set for a 30 Hz measurementandAC coupled, input to the TI rear
panel 30 Hz REF jack.
11

NAVAIR 17—2OAX—737
4.5.3 Verify that the electronic counter indicates between 29.994 and 30.006 Hz.
4.5.4 Set the TI FREQUENCY MHz switches to 108.100, and the G/S DDM switch to 90 Hz.
4.5.5 Disconnect the electronic counter from the TI 30 Hz REF jack, and connect it to the TI rear panel
DEMOD jack.
4.5.6 Verify that the electronic counter indicates between 89.982 and 90.018 Hz.
4.5.7 Set the TI LOC—G/S frequency switch to G/S. Ensure that the TI frequency display indicates
334.700.
4.5.8 Verify that the electronic counter indicates between 89.982 and 90.018 Hz.
4.5.9 Set the TI G/S DDM switch to 150 Hz.
4.5.10 Verify that the electronic counter indicates between 149.97 and 150.03 Hz.
4.5.11 Set the TI LOC—G/S frequency switch to LOC.
4.5.12 Verify that the electronic counter indicates between 149.97 and 150.03 Hz.
4.5.13 Set the TI FREQUENCY MHz switches to 108.000.
4.5.14 Adjust the TI 30 Hz tone modulation control to UNCAL [fully ccw (0)].
4.5.15 Connect the oscilloscope vertical amplifier input to the TI rear panel TONES jack.
4.5.16 Set the oscilloscope controls for 500 mV vertical sensitivity, 100 i.ts/div sweep time, and the trigger
slope to positive (+).
4.5.17 Adjust the oscilloscopetrigger and position controls to vertically centerthe TI 9960 Hz signal on
the oscilloscope CRT display, and position the sweep trigger point at the left edge of the horizontal center
line. (See Figure 1.)
Figure 1. FMDeviation Display
..,~.I ~
Expand —~
I :(“ ~
12

NAVAIR 17—2OAX—737
4.5.18 Use the oscilloscope delayed sweep function to expand the portion of the TI signal indicated in
Figure 1, with the oscilloscope delayed timebase set for 10 p.s/div. such that the display is similar to Figure
2. Verify that the deviation of the expanded display corresponds to delta time (st) = 48.5 p.s ±2.4 p.s.
Figure 2. 9960 Hz Deviation (Expanded)
4.5.19 Verify that the electronic counter indicates between 9958.008 and 996 1.992 Hz.
4.5.20 Adjust the TI 9960 FM tone modulation control to UNCAL [fully ccw (0)].
4.5.21 Setthe TI 30 Hz tone modulation control to the CAL (UNCAL lamp off) position.
4.5.22 Verify that the electronic counter indicates between 29.994 and 30.006Hz.
4.5.23 Setthe TI 9960 FM tone modulation control to the CAL (UNCAL lamp off) position, the
FREQUENCY MHz switches to 118.000, and the Meter function switch to OFF.
4.5.24 Verify that the electronic counter indicates between 1014.9 and 1025.1 Hz.
4.5.25 If the TI is a NAV—750B, proceed with step 4.5.26. Otherwise, if the TI is not a NAV—750B, skip
to step 4.5.32.
4.5.26 Set the TI FREQUENCYMHz switches to 075.000, and the Meter function and Tone Selector
switch to 400 Hz.
4.5.27 Verify that the electronic counter indicates between 397.2 and 402.8 Hz.
4.5.28 Set the TI meter function and tone selector switch to 1300 Hz.
4.5.29 Verify that the electronic counter indicates between 1290.9 and 1309.1 Hz.
Deviation
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NAVAIR 17—2OAX—737
4.5.30 Set the meter function and tone switches 3000 Hz.
• 4.5.31 Verify that the electronic counter indicates between 2979.0 and 3021.0 Hz.
4.5.32 Disconnect the electronic counter and the oscilloscope from theTI.
4.6 TONE DISTORTION TESTS
4.6.1 Set the TI controls to the following positions:
FREQUENCY MHz switches to
LOC-G/S frequency switch to
BEARING-FREQ switch to
MASTER MOD control to
9960 Hz FM tone MOD control to
1020 Hz indent tone MOD control to
30 Hz tone MOD control to
LOC DDM switch to
G/S DDM switch to
Meter function switch to
108.000
LOC
FREQ
CAL (UNCAL lamp off)
CAL (UNCAL lamp off)
CAL (UNCAL lamp off)
CAL (UNCAL lamp off)
0
0
0-100 or OFF
4.6.2 Connect the distortion analyzer input to the TI rear panel 30 Hz REF jack. Setthe distortion
analyzer controls for distortionmeasurement of a 30 Hz fundamental, as applicable.
4.6.3 Verify that the distortion analyzer indicates ~0.5% total harmonicdistortion.
4.6.4 Set the TI FREQUENCY MHz switches to 108.100, and set the G/S DDM switch to 90 Hz.
4.6.5 Disconnect the distortion analyzer from the 30Hz REF jack, and connect it to the TI rear panel
TONES jack.
4.6.6 Set the distortion analyzercontrols for distortion measurement of a 90 Hz fundamental, as
applicable.
4.6.7 Verify that the distortion analyzer indicates ~0.4% total harmonicdistortion.
4.6.8 Set the TI LOC—G/S frequency switch to G/S.
4.6.9 Verify that the distortion analyzer indicates 0.4% total harmonicdistortion.
4.6.10 Set the TI G/S DDM switch to 150 Hz.
4.6.11 Set the distortion analyzercontrols for distortion measurement of a 150 Hz fundamental, as
applicable.
4.6.12 Verify that the distortion analyzer indicates ~0.4% total harmonicdistortion.
4.6.13 Set the TI LOC—G/S frequency switch to LOC.
4.6.14 Verify that the distortion analyzer indicates 0.4% total harmonicdistortion.
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NAVAIR 17—2OAX—737
4.6.15 Set the TI FREQUENCY MHz switches to 108.000.
4.6.16 Adjust the TI 9960 FM tone modulation control to the UNCAL [fully ccw (0)] position. Setthe
distortion analyzercontrols for distortionmeasurement of a 30 Hz fundamental, as applicable.
4.6.17 Verify that the distortion analyzer indicates ~0.5% total harmonicdistortion.
4.6.18 Set the TI 9960 FM tone modulation control to the CAL (UNCAL lamp off) position.
4.6.19 Set the TI frequency switch to 118.000 MHz. Setthe distortion analyzercontrols for distortion
measurement of a 1020 Hz fundamental, as applicable.
4.6.20 Verify that the distortion analyzer indicates ~0.5% total harmonicdistortion.
4.6.21 If the TI is a NAV—750B, proceed withstep 4.6.22. Otherwise, if the TI is not a NAV—750B, skip
to step 4.6.28.
4.6.22 Set the TI FREQUENCY MHz switches to 075.000, and the Meter function and Tone Selector
switch to 400 Hz.
4.6.23 Set the distortion analyzer controls for distortionmeasurement of a 400 Hz fundamental, as
applicable, and verify that the distortion analyzer indicates ~.0.7% total harmonicdistortion.
4.6.24 Set the TI meter function and tone selector switch tol300 Hz.
4.6.25 Set the distortion analyzercontrols for distortionmeasurement of a 1300 Hz fundamental, as
applicable, and verify that the distortion analyzer indicates 0.7% total harmonicdistortion.
4.6.26 Set the TI meter Function and the Tone Selector switch to 3000 Hz.
4.6.27 Set the distortion analyzercontrols for distortionmeasurement of a 3000 Hz fundamental, as
applicable, and verify that the distortion analyzer indicates ~0.7% total harmonicdistortion.
4.6.28 Disconnect the distortion analyzer from the TI.
4.7 PERCENT AMPLITUDE MODULATION OF TONESAND MODULATION METER TESTS
4.7.1 Setthe TI controls as follows:
FREQUENCY MHz switches to 108.000
Meter function switch to 0—30
9960 Hz FM tone MOD control to UNCAL [fully ccw (0)]
30 Hz tone MOD control to CAL (UNCAL lamp off)
1020 Hz indent tone MOD control to CAL (UNCAL lamp off)
MASTER MOD control to CAL (UNCAL lamp off)
Output attenuator control to —20 dBm
LOC—G/S frequency switch to LOC
LOC DDM switch to 0
G/S DDM switch to 0
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NAVAIR 17—2OAX—737
4.7.2 Connect the signal generator calibratorsensor module input to the TI RF outputconnector.
4.7.3 Press the signal generator calibratorINSTR PRESET key (Blue key, AUTOMATIC OPERATION
key), andensure that the signal generator calibrator is in the FREQ measurement mode and tunes to the TI
FREQUENCY MHz switches setting. Set the signal generator calibrator for AMmodulation
measurements with the DETECTOR set to PEAK ±12. Activate the signal generator calibrator 3 kHz LP
FILTER.
4.7.4 Verify that the signal generator calibrator indicates between 28.8% and 31.2% AM modulation, and
record the reading.
4.7.5 Verify that the TI meter indicates within ±1.2% (AM depth) of therecorded value in step 4.7.4.
4.7.6 Set the TI meter function switch to 0—100, and then set the TI 30 Hz tone modulation control to the
fully cw position.
4.7.7 Verify that the signal generator calibrator indicates >60% AM modulation.
4.7.8 Set the TI 30 Hz modulation control to the UNCAL [fully ccw (0)] position.
4.7.9 Setthe TI 1020 Hz tone modulation control to the fully cw position.
4.7.10 Activate the signal generator calibrator 50 HzHP FILTER, and the 3 kHz LP FILTER. Verify that
the signal generator calibrator indicates >60% AM modulation.
4.7.11 Setthe TI 1020 Hz tone modulation control to the CAL (UNCAL lamp off) position, and the
9960 Hz tone modulation control to the CAL (UNCAL lamp off) position.
4.7.12 Activate the signal generator calibrator 300 HzHP FILTER, and the >20 kHz LP FILTER.
4.7.13 Verify that the signal generator calibrator indicates between 28.8% and 3 1.2% AMmodulation.
4.7.14 Set the TI 9960 Hz tone modulation control to the fully cw position.
4.7.15 Verify that the signal generator calibrator indicates >60% AM modulation.
4.7.16 Setthe TI 30 Hz tone modulation control to the CAL (UNCAL lamp off) position, and the 9960
Hz tone modulation control to the CAL (UNCAL lamp off) position.
4.7.17 Set the TI FREQUENCY MHz switches to 108.100. Setthe TI G/S DDM switch to 90 Hz.
4.7.18 Deactivate the signal generator calibrator 300 Hz HP FILTER, and activate the 3 kHz LP FILTER.
4.7.19 Verify that the signal generator calibrator indicates between 19.2% and 20.8% AM modulation.
4.7.20 Set the TI G/S DDM switch to 150 Hz, and the TI meter function switch to 0—30.
4.7.21 Verify that the signal generator calibrator indicates between 19.2% and 20.8% AM modulation,
andrecord the reading.
4.7.22 Verify that the TI meter indicates within ±0.8% of the recorded value in step 4.7.21.
4.7.23 Set the TI meter Function switch to 0—100, the G/S DDM switch to 0, the LOC—G/S switch to G/S,
and the LOC DDM switch to 90 Hz.
4.7.24 Verify that the signal generator calibrator indicates between 38.4% and 41.6% AM modulation.
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NAVAIR 17-2OAX-737
4.7.25 Set the TI LOC DDM switch to 150 Hz.
4.7.26 Verify that the signal generator calibrator indicates between 38.4% and 41.6% AM modulation,
and record the reading.
4.7.27 Verify that the TI meter indicates within ±1.6% of the recorded value in step 4.7.26.
4.7.28 Set the TI LOC DDM switch to 0, and the FREQUENCY MHz switches to 118.000.
4.7.29 Activate the signal generator calibrator 50 HzHPFILTER, and the 15 kHz LP FILTER.
4.7.30 Verify that the signal generator calibrator indicates between 28.8% and 3 1.2% AM modulation.
4.7.31 If the TI is a NAV—750B, proceedwithstep 4.7.32. Otherwise, if the TI is not a NAV—750B, skip
to step 4.7.41.
4.7.32 Set the TI controls as follows:
FREQUENCY MHz switches to 075.000
MASTER MOD control to CAL (UNCAL lamp off)
Meter function and toneSelector switch to 400 Hz
1020 Hz indent tone MOD control to CAL (UNCAL lamp off)
Output attenuator control to —20 dBm
4.7.33 Press the signal generator calibratorINSTR PRESET key (Blue key, AUTOMATIC OPERATION
key), and ensure that the signal generator calibrator is in the FREQ measurement mode and tunes to the TI
FREQUENCY MHz switches setting. Setthe signal generator calibrator for AMmodulation
measurements with the DETECTOR set to PEAK ±12. Activate the signal generator calibrator 50 Hz HP
FILTER, and the 15 kHz LP FILTER.
4.7.34 Verify that the signal generator calibrator indicates between 92. 15% and 97.85% AMmodulation,
andrecord the reading.
4.7.35 Verify that the TI meter indicates within ±3% of the recorded value in step 4.7.34.
4.7.36 Set the TI meter function and tone selector switch to 1300 Hz.
4.7.37 Verify that the signal generator calibrator indicates between 92. 15% and 97.85% AM modulation.
4.7.38 Setthe TI meter function and tone selector switch to 3000 Hz.
4.7.39 Activate the signal generator calibrator 300 Hz HPFILTER, and the >20 kHz LP FILTER.
4.7.40 Verify that the signal generator calibrator indicates between 92. 15% and 97.85% AM modulation.
4.7.41 Disconnect the signal generator calibratorsensor module from theTI.
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NAVAIR 17—2OAX—737
4.8 RF LEVEL METER TESTS
4.8.1 Set the TI controls as follows:
FREQUENCY MHz switches to 108.000
Meter function switch to RF
4.8.2 Verify that the TI meter needle is aligned over the RF level vertical mark within ±1.5 needle widths.
4.8.3 Set the TI FREQUENCY MHz switches to 110.000.
NOTE NAV—750B is tested from 110.000 to 150.000 MHz, and from 330.000 to 335.000 MHz,
only.
4.8.4 Advance the TI FREQUENCY MHz switches in 20 MHz steps to 335 MHz (after 330 MHz setting,
set to 335 MHz), and at each setting, verify that the TI meter needle remainsalignedover the RF Level
mark within ±1.5 needle widths.
• 4.8.5 If the TI is a NAV—750B, proceed withstep 4.8.6. Otherwise, if the TI is not a NAV—750B, skip to
subsection 4.9.
4.8.6 Setthe TI FREQUENCY MHz switches to 072.000.
4.8.7 Verify that the TI meter needle is aligned over the RF Level vertical mark within ±1.5 needle widths.
4.8.8 Advance the TI FREQUENCY MHz switches in 2.0 MHz steps to 78.000 MHz, and at each setting,
verify that the TI meter needle remains aligned over the RF level mark within ±1.5 needle widths.
4.9 VOR BEARING TESTS
4.9.1 Set the TI controls as follows:
FREQUENCY MHz switches to 108.000 MHz
30 Hz tone MOD control to CAL (UNCAL lamp off)
1020 Hz indent tone MOD control to CAL (UNCAL lampoff)
9960 Hz FM tone MOD control to CAL (UNCAL lampoff)
BEARING-FREQ switch to BEARING
TO-FROM switch to TO
4.9.2 Connect the navigation indicator T!S input connector to the TI rear panel DEMOD (J23)
connector.
4.9.3 Press the TI 0° VOR bearing selectpushbutton, andensure that the TI bearing display indicates
0.0°.
4.9.4 Verify that the navigation indicator TIS indicates 000.00° ±0.05°.
18