Northern Airborne Technology NTX - Manual (Page 45)

NTX066 Installation Approval Test Procedure
Rev. 1.00 Aug 10, 2005 Page 3 of 5
ENG-FORM: 634-0101.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Example – Bendix/King KY 196A
The first intermediate frequency (I.F.) is 11.4 MHz. The local oscillator (L.O.)
frequency is above the received frequency (high side injection) therefore, the
image frequency is 22.8 MHz above the selected frequency. The frequency band
for the NTX066 is from 66.000 MHz to 87.9975 MHz therefore, the second
harmonic could cause interference with the VHF Comm. Set the KY 196A to
120.000 MHz and the NTX066 to 71.400 MHz. The image frequency for the KY
196A would then be 120.000 + 22.800 MHz, which equals 142.800 MHz. The
second harmonic of 71.400 MHz is 142.800 MHz.
Frequencies Results
Channel Image NTX066 Pass Fail
VHF #1
VHF #1
VHF #2
VHF #2
Table 2
NOTES:
5.3
Modulate the NTX066 transmitter on the frequencies listed in Table 3 for at least 20
seconds. Listen for any noise or detected audio signals on the receiver audio and look for
any movement of flags or needles on the navigation displays.
Frequencies Results
Channel VOR/ILS NTX066 Pass Fail
VOR/ILS #1 108.000 MHz 66.025 MHz
VOR/ILS #1 108.100 MHz 66.025 MHz
VOR/ILS #2 108.000 MHz 66.025 MHz
VOR/ILS #2 108.100 MHz 66.025 MHz
Table 3
NOTES: