Filter
Top Products
400 SERIES MAINTENANCE MANUAL Page 5-25
P/N 190-00140-05 Rev. C
5.7.3 Navigation Receiver Final Tests
5.7.3.1 Voice/Ident Audio Output Level
1. Apply a standard audio test signal having a RF level of -93 dBm.
2. Select maximum audio (volume control turned fully clockwise), and turn off the ident filter.
3. Measure 500 : VOR/ILS AUDIO HI J6-16 with respect to 500 : VOR/ILS AUDIO LO
J6-17.
4. Verify an audio output level into a 500 Ohm load that is not less than 20 Vpp (7.07 Vrms).
Audio Output Level_________ NLT 20 Vpp
5. Select minimum audio (volume control turned fully counter clockwise without turning off).
6. Verify an audio output level into a 500 Ohm load that is not more than 63 mVpp
(22 mVrms).
Audio Output Level_________ NGT 63 mVpp
5.7.3.2 Voice/Ident Audio Frequency Response
1. Turn the ident filter off.
2. With an RF input level of -73 dBm, measure 500 : VOR/ILS AUDIO HI J6-16 with respect
to 500 : VOR/ILS AUDIO LO J6-17 for 350, 1000, and 2500 Hz.
3. Set audio output to a 7.07 Vrms @ 1000 Hz then verify the difference between the maximum
and minimum VOICE/IDENT audio output levels is less than 6 dB, at the three frequencies
listed above.
Max and Min Levels_________ < 6 dB
4. Measure 500 : VOR/ILS AUDIO HI J6-16 with respect to 500 : VOR/ILS AUDIO LO
J6-17 for 150 Hz relative to the peak audio level frequency and for 9000 Hz relative to the
peak audio level frequency.
5. Verify the output is not less than 20 dB relative to 1 kHz audio output.
Output_________ NLT 20 dB