TECHNISONIC INDUSTRIES LIMITED
www.til.ca
TDFM-9100 Installation Instructions
TiL 13RE483A
2-11
2.22
POST INSTALLATION EMI TEST
PURPOSE
The purpose of this test is to identify any interference that the TDFM-9100 transceiver may cause
with existing aircraft systems.
TEST CONDITIONS
The TDFM-9100 transceiver should be installed and function tested. The antenna VSWR should
be checked. A forward/reverse power check with an in-line wattmeter should show no more than
10% reflected power. For the following tests, insure that the output power is set to high.
METHODOLOGY
Most of the EMI tests can be accomplished on the ground. In some cases flight testing is required
or is easier. If the aircraft is approved for IFR operations, then it is mandatory that interference
between the TDFM-9100 transceiver and the approach aids be checked in flight.
The GPS should be operational and navigating with at least the minimum compliment of
satellites. The VHF comm should be set to the frequencies indicated with the squelch open.
VOR/DME receivers should be set to the frequencies indicated and selected for display. If
possible, set up a DME ramp test set on the frequencies indicated and adjust the output until the
flags are out of view. The transponder and encoder should be monitored with ramp test
equipment. Set the output of the transponder test set to 3db above the output necessary to
achieve 90% reply. If possible set the ADF to a nearby navigation station.
Modulate the TDFM-9100 transmitter on the indicated frequencies for at least 20 seconds.
Observe the GPS for any degradation in satellite status or availability or flags. Listen for any
noise or detected audio signals on the VHF comm(s). Listen for any noise or detected audio
signals on the VOR/LOC receiver audio; look for any moment of flags or needles on the
VOR/LOC/GS navigation display(s). Observe the transponder for any loss of reply or spurious
reply.
List the power plant, fuel and other electric instruments in the chart provided and note any
anomalies that occur while transmitting. Assess the results.
If the aircraft is equipped with an autopilot or a stability augmentation system, then test fly the
aircraft and verify that operation of the TDFM-9100 transceiver does not have adverse effects on
these systems. After checking for gross effects at a safe altitude, fly an approach with each of the
different navigation systems coupled to the autopilot (ILS, GPS ETC.) and look for any anomalies.
