TB 9-6625-2076-35
IDENTIFICATION AND DESCRIPTION
1. Test Instrument
Identification.
This bulletin provides instructions for the
calibration of Receiver Test Set, AN/ARM-180 (Collins, Model 479S-6( ) ). TM 11-6625-
2975-40 was used as the prime data source in compiling these instructions. The equipment
being calibrated will be referred to as the TI (test instrument) throughout this bulletin.
a. Model Variations. None.
b. Time and Technique. The time required for this calibration is approximately 4
hours, using the dc and low frequency technique.
2. Forms,
Records, and
Reports
a. Forms, records, and
reports required for calibration personnel at all
levels are
prescribed by TB 750-25.
b. Adjustments to be reported are designated (R) at the end of the sentence in which
they appear. When adjustments are in tables, the (R) follows the designated adjustment.
Report only those adjustments made and designated with (R).
3. Calibration
Description. TI
parameters and
performance specifications which
pertain to this calibration are listed in table 1.
Test instrument parameters
Performance specifications
Output frequency
Range: 74.6 to 335 MHz
0.0002%
Accuracy:
Output level
Range: -6 to -120 dBm (112 mV to 0.22 V)
1
Accuracy: -6 to -60 dBm, 1.5 dB
-60 to -120 dBm, 2.0 dB
Modulation tone
Accuracy: 0.005%
Modulation tone distortion
Range: 30, 30 VAR, 1020, 9960, 90, 150, 400,
1300, and 3000 Hz
Accuracy: 0.25% at 30, 30 VAR, 90 and 150 Hz
0.5% at 1020 and 9960 Hz
1.0% at 400, 1300, and 3000 Hz
Amplitude modulation
Range: 20, 30, 40, 80, and 95%
Accuracy: 2.5% at 20, 30, 40, and 80%
5% at 95%
FM deviation
Frequency: 480 Hz
Accuracy: 2 Hz
Localizer DDM
Range: 0.400 in 0.001 increments
Accuracy: On course, 0.00056 DDM
Off course, 0.00056 DDM +2.5% DDM
Glideslope DDM
Range: 0.800 in 0.001 increments
Accuracy: On course, 0.00102 DDM
Off course, 0.00102 DDM +2.5% DDM
VOR radial
Range: 0 to 359.99
2
Accuracy: 0.14O
1Verified
to -20 dB mW on TI.
2Accuracy
referenced to standard used in calibration.
CHANGE 1
2