Comprehensive Guide to Chelton DF 935 Tactical Direction Finder Installation
After the physical and electrical installation is complete, a rigorous testing procedure is mandatory.
: The corresponding control panel or Control Display Unit (CDU) is typically installed in the center console of the cockpit. Dimensions & Clearance : Antenna Diameter : 286 mm. Antenna Height (External) : 90 mm. Internal Penetration : 75 mm.
Mechanical installation and manufacturing drawings (for mounting brackets). Wiring diagrams and engineering orders. Instructions for Continued Airworthiness (ICA). Flight Manual Supplement (FMS). chelton df 935 2 pdf install
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Five parallel receivers monitor fixed critical frequencies, including 121.5 MHz (Civil Distress), 156.525 MHz (Marine DSC Ch. 70), 156.800 MHz (Marine Ch. 16), 243.0 MHz (Military Distress), and 406.025 to 406.076 MHz (COSPAS-SARSAT beacons).
Understanding these figures is vital because they dictate cable types, grounding methods, and antenna placement—all detailed in the PDF. Comprehensive Guide to Chelton DF 935 Tactical Direction
The DF-935-2 is a 3-ATI short unit. The PDF will detail:
For successful integration, installers should refer to platform-specific modification packages, such as those provided by MAP21 for Airbus AS365/EC155 helicopters , which include:
To ensure you have followed the manual correctly, print this checklist from your PDF: Antenna Height (External) : 90 mm
Many third-party PDF hosting sites offer a file named Chelton_DF935_Install_RevD.pdf that is missing the 2-channel addendum. Always verify:
After physical installation, the PDF instructs you to connect a laptop via RS-422 (not USB—an adapter is needed). Using Chelton’s DFconfig.exe (supplied separately), you must:
Ensure the unit is clear of other radiating antennas and metallic obstructions to maintain the claimed 5° RMS accuracy. 3. Electrical Connections