TB 9-6625-2076-24
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.
Table 1. Calibration Description
Test instrument parameters
Performance specifications
Output frequency
Range: 74.6 to 335 MHz
0.0002%
Accuracy:
Range: -6 to -120 dBm (112 mV to 0.22 V)
1
Output level
Accuracy: -6 to -60 dBm, 1.5 dB
-60 to -120 dBm, 2.0 dB
Modulation tone
Frequency: 30 Hz variable
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
Range: 0.400 in 0.001 increments
Localizer DDM
Accuracy: On course, 0.00056 DDM
Off course, 0.00056 DDM +2.5% DDM
Range: 0.800 in 0.001 increments
Glideslope DDM
Accuracy: On course, 0.00102 DDM
Off course, 0.00102 DDM +2.5% DDM
2
VOR radial
Range: 0 to 359.99
Accuracy: 0.14
1Verified
to -20 dB mW on TI.
2Accuracy
referenced to standard used in calibration.
