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· f. Trans mit ter Mod ule
Bat tery Pack
Fixed An tenna
Con necting Coax Ca ble
Programming Adapter (Op tional)
Mounting Tray
Protective Top Cover
Mounting Tray End Cap
Cock pit Re mote Switch As sembly
Buzzer
Installation Kit
1.3. TRANSMITTER CHAR -
AC TER IS TICS
The printed cir cuit as sembly (PCA) of
the C406-N se ries ELT has no RF
func tion but rather only con trol func -
tions for the RF mod ule as well as
the cir cuitry to pro cess po sition data
and the 24-bit air craft ID ad dress. The
PCA con tains one time pro grammable
microprocessors that con trols all the
ELT func tions (ON/OFF, mod ulation,
406 MHz dig ital mes sage and RE -
SET).
All RF func tions are con tained in a
separate mod ule. The trans mit ter op er -
ates si mul ta neously on 121.5 and
ARTEX AIRCRAFT SUPPLIES DOCUMENT #570-5060
07/11/03 PAGE1-3
243.0 MHz with the car rier fre quencies
remaining 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
406.028 MHz trans mit ter trans mits.
1.3.1. 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 -
lation ap plied to the car rier fre quency
has a min imum duty cy cle of 33%
and a max i mum duty cy cle of 55%.
The ARTEX C406-N se ries ELT is
designed 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
degrees Cen ti grade.
1.3.2. 406.028 MHz TRANS -
MITTER
A dig ital in formation mes sage is
sent to the sat ellite via the 406.028
MHz trans mit ter. The mod ulation is
phase mod u lated and clas sified as
16K0G1D. Ev ery 47.5 to 52.5 seconds
the 5 Watt trans mit ter is turned
on for 440 mS (short mes sage) or
520 mS (long mes sage)
The in formation sent to the sat ellite
is either pro grammed at the fac tory or
as part of the in stal la tion pro cess and
ARTEX AIRCRAFT SUPPLIES DOCUMENT #570-5060
07/11/03 PAGE 1-4
FIG URE 1-1 G-SWITCH CURVE
contains a unique num ber that can be
used to iden tify the bea con.
1.4. FCC REQUIREMENT
The ELT shall main tain a fre quency
sta bil ity of 50 parts per mil lion on
121.5 and 243.0 MHz. This al lows a
vari a tion of plus or mi nus 6.075 KHz
at 121.5 MHz.
On any fre quency re moved from the
assigned fre quency by more than 50
per cent up to and in clud ing 100 per -
cent of the au tho rized band width the
power is to be at tenuated at least 25
dB.
On any fre quency re moved from the
assigned fre quency by more than 100
per cent up to and in clud ing 250 per -
cent of au thorized band width the
power is to be at tenuated at least 35
dB.
On any fre quency re moved from the
assigned fre quency by more than 250
per cent of the au thorized band width
the power is to be at tenuated at least
40 dB.
There are no equiv a lent FCC re quire -
ments for the 406.028 MHz fre quency.
1.5. TSO RE QUIRE MENTS
To gain TSO ap proval of a 406.028
MHz ELT it is nec essary to meet the
requirements of TSO C126. The following
sec tions con tain de scriptions of
com po nents nec essary to meet TSO
C126 with the ARTEX C406-N se ries
ELT’s.
1.5.1. ACTIVATION MON I TOR
An au ral and/or vi sual mon itor is pro -
vided to alert the pi lot when the ELT
has been ac ti vated and is trans mit ting.
The fol lowing re quirements ap ply to
the ac ti va tion mon itors:
a. Au ral Mon itor - The au ral mon i tor
pro vides a dis tinct sig nal en abling a
search and res cue team to lo cate an
air craft with a trans mit ting ELT in a
con fined area with a large num ber of
air craft (i.e. such as an air port). The
search and res cue team would lis ten
for the au ral mon i tor and eas ily lo cate
and dis able the of fend ing ELT with out
a great deal of ef fort.
b. Vi sual Mon i tor - The vi sual mon i -
tor is de signed to be in stalled so that
it can be viewed from the pi lot’s po si -
tion. Its in tended func tion is to in form
　
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