Some installations that require longer runs of antenna coax (up to 20 feet) may require the use of low loss coax cable. Artex recommends ECS cable P/N 311201 with BNC connector P/N CBS122. Please note that Artex does not stock or sell these parts. Contact ECS at the following:
ECS
5300 West Franklin Drive
Franklin, Wisconsin 53132 USA
Toll Free: (800) 327-9473
Telephone: (414) 421-5300
Facsimile: (414) 421-5301
http://www.ecsdirect.com/ecs_home.html
2.8 Transmitter Test
Always perform the tests within the first 5 minutes of the hour. Notify any nearby control tower of your intentions, in accordance with AC 43.13. If outside of the US, always follow all local or national regulations for testing of ELTs.
Caution!
Do not allow test duration to exceed 5 seconds. A false alarm may be generated.
Any time the ELT is activated, it is transmitting a 121.5 MHz distress signal. After approximately 50 seconds, a “live” 406 MHz distress signal is transmitted and is considered valid by the satellite system.
Whenever the ELT is switched from “ON” to “ARM” a 406 MHz signal is transmitted, however, it is specially coded as a “self-test” signal that is ignored by the COSPAS-SARSAT satellites.
2.8.1 Self-Test
. Tune a receiver (usually the aircraft radio) to 121.5 MHz. Turn the ELT aircraft panel switch “ON” for about 1 second, then back to the “ARM” position. The receiver should voice about 3 audio sweeps.
. At turn-off (back to ‘ARM’ state) the panel LED should present 1 pulse (buzzer will not sound for 1 pulse). If more are displayed, determine the problem from the list below.
1 Flash – Indicates that the system is operational and that no error conditions were found.
3 Flashes – Bad load detected. Detects open or short condition on the antenna output or cable. These problems can probably be fixed by the installer.
Check that the RF cable is connected and in good condition. Perform continuity check of center conductor and shield. Check for a shorted cable.
Check for intermittent connection in the RF cable.
If this error code persists there may be a problem with the antenna installation. This can be checked with a VSWR meter. Check the antenna for opens, shorts, resistive ground plane connection.
4 Flashes – Low power detected. Occurs if output power is below about 33 dBm (2 watts) for the 406 signal or 17 dBm (50 mW) for the 121.5 MHz output.
Check coax and connections
Check antenna installation
Check the frequencies are within acceptable limits
5 Flashes – Indicates that the ELT has not been programmed. Does not indicate erroneous or corrupted programmed data.
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