Product Info
PTR for VHF-4000 and VDL-2000 Data Radios
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©2000 Rockwell Collins, Inc Page 22 of 61
2) Set Standard Discrete Configuration.
3) Set rear connector simulcomm discretes to 01(VHF4000 Pins 42 open and 46
ground, VDL Pins 16 open and 34 ground).
4) Set the generator RF level to -50 dBm and 90% modulation, 1 kHz Tone.
5) Monitor the AGC_Level output of the RF Card or the Label 353 AGC Level
6) Increase the RF level in 1 dB steps
7) Verify the RF level required to cause a 2% change in AGC Level.
8) Repeat steps 4 through 6 for channel 132.000 MHz
Production Limit:
-10 dBm +/- 10 dBm
1.2.1.1.1. 0 DBM THRESHOLD
1) Set Standard ARINC Configuration at 112.00 MHz.
2) Set Standard Discrete Configuration.
3) Set rear connector simulcomm discretes to 10 (VHF4000 Pins 42 ground and 46
open, VDL Pins 16 open and 34 ground).
4) Set the generator RF level to -50 dBm and 90% modulation, 1 kHz Tone.
5) Monitor the AGC_Level output of the RF Card or the Label 353 AGC Level
6) Increase the RF level in 1 dB steps
7) Verify the RF level required to cause a 2% change in AGC Level.
8) Repeat steps 4 through 6 for channel 132.000 MHz
Production Limit:
0 dBm +/- 10 dBm
7.2.1.2 SENSITIVITY
1.2.2.1.1. SENSITIVITY 25 KHZ MODE CHANNEL 118.000 (BAND 1 LOW SIDE)
1) Set the UUT discrete inputs to “standard discrete configuration”.
2)
Set the RF Generator to “standard RF generator configuration” at 118.000 MHz.
3)
Disable squelch
4)
Set the ARINC control data to “Standard 25 kHz ARINC Configuration” on channel 118.000 MHz.
5)
Set the RF generator output level to –103.5 dBm.
6)
Verify the S+N/N ratio at the combined audio output
Production Limit:
14.25 +/- 5.75 dB
1.2.2.1.1. SENSITIVITY 25 KHZ MODE CHANNEL 118.975 (BAND 1 HIGH SIDE)
1)
Set the ARINC control data to channel 118.975.
2)
Set the RF Generator to “standard RF generator configuration” at 118.975.
3)
Verify the S+N/N ratio at the combined audio output.
Production Limit:
14.25 +/- 5.75 dB
1.2.2.1.1. SENSITIVITY 25 KHZ MODE CHANNEL 119.500 THROUGH 135.500
(BANDS 2 – 17 CENTERS)
1)
Set the RF Generator frequency to 119.550, 120.550, 121.550, …, 135.550 MHz.
2)
Set the ARINC control data to channel to 119.550, 120.550, 121.550, …, 135.550 MHz.
3)
Verify the S+N/N ratio at the combined audio output.