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MHz
· Fre quency:121.5 MHz
· Fre quency Tol er ance: +/-6.0 KHz
· Mod u la tion: AM
· Power Out put: >/= 23.0 dBm
ARTEX AIRCRAFT SUPPLIES DOCUMENT # 570-5060
03/22/04 PAGE 4-15
4.4.2 Spec i fi ca tions @ 243.0 MHz
· Frequency:243.0 MHz
· Frequency Tol erance:+/-12.0 KHz
· Modulation: AM
· Power Out put: >/= 23.0 dBm
4.4.3 Spec i fi ca tions @ 406.028
MHz
· Frequency: 406.028 MHz
· Frequency Tol erance: +/- 1 KHz
· Modulation: Bi-phase L
· Power Out put: 37.0 dBm +/- 2dBm
4.4.4 Transmitter Test
Perform the trans mit ter tests by ac tivat -
ing the ELT and lis ten ing on 121.5 MHz.
An am plitude mod u la tion (AM) broad cast
radio re ceiver should be used to de ter -
mine if en ergy is be ing trans mit ted from
the an tenna (see sec tion 4.3.17).
NOTE: All ELT “ON” tests should be per -
formed within the first five min utes af ter
the hour UTC.
4.5. ELT Bat tery Pack Re -
place ment
NOTE: The bat tery pack con tains
static sen sitive parts, take ESD pre cau -
tions be fore han dling. Re move the four
screws from the bat tery pack. Be fore pro -
ceeding fur ther, read the fol low ing ad vi -
sory to avoid dam age to the ELT. Also
refer to Fig ure 4-4.
WARNING: The bat tery pack is con -
nected to the ELT via short in terconnect
harnesses which limit the dis tance of sep -
a ra tion be tween the two com po nents prior
to dis con nect ing the har nesses. Pro ceed
as fol lows:
· Lay the ELT on its side.
· Care fully lift the bat tery pack away from
the ELT and lay along side the ELT
unit.
· Care fully dis connect the har ness from
the 8-pin con nector on the small cir cuit
board in the bat tery pack. Do not short
con nec tor pins.
· Dis connect 2-pin har ness.
In spect the bat tery pack and un derside
of ELT. Bat tery cells, com ponents and
con nec tors should be cor ro sion free. The
un der side of ELT should be cor ro sion
free. In spect for any bro ken wires or con -
nec tions. En sure the bat tery hous ing is
free of cracks or other vis ible dam age.
The bat tery pack must be re placed with
a new one:
· Af ter use in an emer gency;
· Af ter an in advertent ac ti va tion of un -
known du ra tion;
· When the to tal of all known trans mis -
sions ex ceeds one hour;
· On or be fore the bat tery re place ment
(ex pi ra tion) date as shown on bat tery
ex pi ra tion la bel. Note: The bat tery
pack (452-0133) expires 5 years from
the date (month) it is shipped from
ARTEX .
When in stalling a new bat tery pack, re -
move the pa per back ing from the rub ber
seal at the con nec tor end of the bat tery
pack. It is rec ommended that this seal be
coated with a non-petroleum based sil i -
cone grease (i.e. GE G-635 or
SSP-1212, avail able from ARTEX as P/N
850-0920) to pro vide a mois ture re sistant
seal once the bat tery is in stalled.
ARTEX AIRCRAFT SUPPLIES DOCUMENT # 570-5060
03/22/04 PAGE 4-16
To re place/reinstall the bat tery pack, con -
nect the 8-pin con nec tor to the header on
the cir cuit board in the bat tery pack.
Connect the 2-pin con nec tor to the re -
cessed con nector in side the ELT body.
This step will cause the ELT to ac tivate.
Re set the ELT by tog gling the “ON/OFF”
switch on the ELT from “ON” to “OFF”.
Reseat the bat tery pack on the ELT,
dressing the har ness wires away from the
standoffs to avoid pinch ing the wires be -
tween the bat tery pack and the stand offs.
Connect the SARSAT Bea con Test Set,
through a 30 dB (min i mum) at tenuator,
to the ELT’s BCN con nec tor. Ac ti vate the
ELT and al low the ELT to trans mit 3 to 4
406.028 MHz bursts. There upon, ver ify
that there is not a “BAD FRAME” or
NORMAL BAD" mes sage on the Test Set
display which would in di cate a prob lem
with the bat tery pack (i.e. a bad IC on
the bat tery cir cuit board).
In stall the four Phil lips head screws and
tighten se curely. Do not over torque the
screws.
Once the ELT has been tested, as ap -
pli ca ble, and re installed in the air craft as
de scribed in this chap ter, ap ply the bat -
tery ex pi ra tion date la bel pro vided with
the bat tery pack to the ex terior of the
ELT (i.e. on the end cap or other vis i ble
lo ca tion).
　
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