CDA RC 9000 Users operating instructions Istruzioni per gli Interventi Scaricare il pdf (Pagina 22)

TECHNISONIC INDUSTRIES LIMITED

TDFM-9000 Installation Instructions TiL 11RE442 Rev. B Issue 5

2-13

2.21 ANTENNA SELECTION AND INSTALLATION CONSIDERATIONS

Antenna installations will vary according to the number / type of bands installed in the TDFM-

9000, types of antennas selected, and space available on the aircraft. The materials list above

contains many but not all antennas available. If dual band RF modules are installed in the TDFM-

9000, it is suggested to use a single connector, multiband antenna for each of the RF modules

installed. When single band modules are installed, a single band antenna should be used. If the

TDFM-9000 has more than one single band module installed that are on different frequency

bands, a single multiband antenna with separate connectors or a multiband antenna with a

coupler can be used if the frequencies in use are not multiples of each other. For example,

transmitting near 150 MHz on VHF may interfere with frequencies near 450 MHz on the UHF

band. Antennas should be spaced as far as possible from each other with the Comm antennas on

the opposite side (top or bottom) from the FM antennas. See Technisonic’s Transceiver

Installation Guide and Antenna Selection Guide for more details.

2.22 POST INSTALLATION EMI TEST

PURPOSE

The purpose of this test is to identify any interference that the TDFM-9000 transceiver

may cause with existing aircraft systems.

TEST CONDITIONS

The TDFM-9000 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, ensure 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-9000 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-9000 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-9000 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.

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 33 34

Commenti su questo manuale

Nessun commento

CDA RC 9000 Users operating instructions Istruzioni per gli Interventi Pagina 22

Commenti su questo manuale

Prodotti e manuali riguardandi Fornelli CDA RC 9000 Users operating instructions