Product Info
PTR for VHF-4000 and VDL-2000 Data Radios
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©2000 Rockwell Collins, Inc Page 24 of 61
1.2.2.1.1. SENSITIVITY 8.3 KHZ MODE CHANNEL 126.005
1)
Set the RF Generator frequency to 126.000 MHz.
2)
Set the ARINC control data to “Standard 8.33 kHz ARINC Configuration” on channel 126.005.
3)
Verify the S+N/N ratio at the combined audio output.
Production Limit:
14.25 +/- 5.75 dB
7.2.1.3 SENSITIVITY DURING LOW LINE VOLTAGE [ENTRY]
1.2.3.1.1. SENSITIVITY DURING LOW LINE VOLTAGE CHANNEL 118.000
1)
Set the UUT power input for +18 ± 0.2 Vdc.
2)
Set the UUT discrete inputs to “standard discrete configuration”.
3)
Set the RF Generator to “standard RF generator configuration” at 118.000 MHz.
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:
>= 8.5 dB
1.2.3.1.1. SENSITIVITY DURING LOW LINE VOLTAGE CHANNEL 136.975
1)
Set the RF Generator frequency to 136.975 MHz.
2)
Set the ARINC control data to channel 136.975.
3)
Verify the S+N/N ratio at the combined audio output.
4) Reset the UUT power input to +27.5 ± 0.1 Vdc.
Production Limit:
>= 8.5 dB
7.2.1.4 RECEIVER QUIETING
1)
Set the RF generator to “standard RF generator configuration” at 126.000 MHz.
2)
Set the ARINC control data to channel 126.000.
3)
Set the RF generator output level to -53 dBm.
4)
Establish a 0 dB reference for the combined audio output level.
5)
Remove the modulation from the RF generator.
6)
Verify the change in the level of the combined audio output signal.
Production Limit:
>= 45 dB
7.2.1.5 IMAGE REJECTION
1)
Channel the receiver to 135.975 MHz.
2)
Set the RF Generator to “standard RF generator configuration” at 135.975 MHz.
3)
Record the RSSI level for an input of –103.5 dBm.
4)
Set the RF Generator to 193.725 MHz.
5)
Increase the level out of the RF Generator until the RSSI level is the same as obtained in step 3.
Production Limit:
>= 60 dB