NAVAIR 17—2OAX—737
SECTION 1
INTRODUCTION AND 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 was derived 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 essential performance parameters only. Any malfunction noticed
during calibration, 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: ±1ppm
Range: 70.0 MHz to 335.0 MHz
Tolerance: ±1.5dB
@
—6 dBm to
-50 dBm; ±2.5
dB
@
-51 dBm to
—120 dBm
Range: —6 to —50 dBm
Tolerance: ±1.5dB
Range: —51 to —120 dBm
Tolerance: ±2.5dB
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.
Attenuator output monitored
by a power meter while the
frequency is verified.
Attenuator output 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.
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