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Page 5-38 400 SERIES MAINTENANCE MANUAL
Rev. C P/N 190-00140-05
5.7.5.4 Glideslope Superflag Output Test
1. Select flag ‘HIDDEN’.
2. Verify GLIDESLOPE superflag output voltage is not less than PWR_IN minus 1.5 V.
GLIDESLOPE Superflag Output ______ (NLT Power_IN minus 1.5 V)
3. Select Flag ‘IN VIEW’.
4. Verify GLIDESLOPE superflag output is 0 r250 mV.
GLIDESLOPE Superflag Output ______mV
5.7.5.5 Receiver Sensitivity
The Glideslope receiver sensitivity is defined as the minimum
RF input level of a Standard Glideslope Deflection test signal,
which results in a maximum deviation of 60% of standard
deflection (78 mV x 60% = 46.8 mV).
1. Apply a glideslope standard deviation test signal to the unit.
2. Measure GLIDESLOPE +UP (J6-32) with respect to GLIDESLOPE +DOWN
(GLIDESLOPE Common) (J6-31).
3. Measure at the following GLIDESLOPE (LOC) frequencies and verify the sensitivity is
better than –92 dBm.
329.15 MHz (108.95 MHz) _________>(-92 dBm)
332.00 MHz (109.30 MHz) _________> (-92 dBm)
335.00 MHz (110.30 MHz) _________> (-92 dBm)
4. Verify the receiver sensitivity variation is not greater than 3 dB at the three frequencies in
step 3.
Receiver Sensitivity Variation ________NGT 3 dB