Specifications

All RF func tions are con tained in a
sep a rate mod ule. The trans mit ter op er -
ates si mul ta neously on 121.5 and
243.0 MHz with the car rier fre quen cies
re main ing within 0.005% un der all en
-
vi ron men tal op er at ing con di tions. Ap-
prox i mately ev ery 50 sec onds the
406.025 MHz trans mit ter trans mits.
Dur ing this time the 121.5 and 243.0
MHz trans mit ter is mo men tarily turned
off.
1.2.1. 121.5/243.0 MHz TRANS-
MITTER
The AM mod u la tion at 121.5 and
243.0 MHz is des ig nated as A9 with
the car rier am pli tude mod u lated with
an au dio fre quency sweep ing down -
ward over a range of not less than
700 Hz, within the range of 1,600 to
300 Hz. The sweep rep e ti tion rate is
be tween 2 and 4 Hz with a mod u la -
tion fac tor of at least 0.85. The mod u -
la tion ap plied to the car rier fre quency
has a min i mum duty cy cle of 33%
and a max i mum duty cy cle of 55%.
The ARTEX C406-2 se ries ELT is
de signed for a con stant power out put
at 121.5 and 243.0 MHz that will not
be less than 23 dBm (200 mW) dur
-
ing the 50 hour op er a tional pe riod at
both -20 de grees Cen ti grade and +55
de grees Cen ti grade.
1.2.2. 406.025 MHz TRANS -
MITTER
A dig i tal in for ma tion mes sage is
sent to the sat el lite via the 406.025
MHz trans mit ter. The mod u la tion is
phase mod u lated and clas si fied as
16K0G1D. Ev ery 47.5 to 52.5 sec-
onds the 5 Watt trans mit ter is turned
on for 440 mS (short mes sage) or
520 mS (long mes sage)
ARTEX AIRCRAFT SUPPLIES DOCUMENT #570-5000
06/30/99 PAGE 1-4
FIG URE 1-1 G-SWITCH CURVE