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The 406.028 MHz power out put should be
37 dBm +/- 2 dBm (3.16 W min to 7.94
W max).
4.3.11 (Step 5f) Mea sure the
406.028 MHz Fre quency
En sure that ad e quate at tenuation rated
for 406.028 MHz, 37 dBm and 5 Watts is
installed be tween the ELT’s 406.028 MHz
out put and the in put to the fre quency
counter to pre vent dam ag ing the fre -
quency coun ter’s in put cir cuitry.
Set up the equip ment as shown be low:
Ver ify an ini tial fre quency of 406.028 MHz
+/- 1 KHz.
NOTE: Al low the unit to run 30 sec onds
before mak ing the mea surement to al low
the os cil la tor to sta bi lize.
4.3.12 (Step 5g) Cur rent Draw
Tests
CAU TION: The fol lowing tests in volve
mea sure ments of the lith ium bat tery pack.
Ex er cise ex treme cau tion to avoid caus ing
a short cir cuit con dition which will blow
the fuses on the bat tery pack. It is rec -
om mended that only an ex perienced tech -
ni cian per form these tests.
A test har ness (p/n 611-0024) may be
ordered from ARTEX Air craft Sup plies at
1-800-547-8901.
All tests must be per formed in an RF
screen room or with the ELT in a
shield-ed con tainer that will sub stan tially
at ten u ate the RF sig nal.
All “ON” state cur rent mea surements
must be made with the RF out puts loaded
with 50 ohms rated for 5 Watts
(either a re sis tive load or equip ment with
50 ohm im pedance pad ded with 10 dB/ 5
Watt at tenu ator, i.e. a spec trum an alyzer).
NOTE: The ELT may ac tivate (turn
“ON”) when the var i ous con nections are
ini tially made dur ing the fol lowing cur rent
tests. This is nor mal. Re set the unit to
“OFF” ,if this hap pens, by tog gling the
ON/OFF switch to “ON” and back to
“OFF”.
“ARM” (“OFF”) State Cur rent
Mea sure ment:
· Re move the bat tery pack as de scribed
in Sec tion 4.3.3
· Dis con nect the 2-pin har ness
· In stall the test har ness 611-0024 and
an in- line am me ter as shown in Fig ure
4-2
ARTEX AIRCRAFT SUPPLIES DOCUMENT # 570-5060
03/22/04 PAGE 4-7
Frequency
Applicable Counter
Attenuator
ELT
BNC
Connector
ELT
BNC
Connector
Applicable
Attenuator
SPECTRUM
ANALYZER
ARTEX AIRCRAFT SUPPLIES DOCUMENT # 570-5060
05/12/03 PAGE 4-8
FIG URE 4-2 TEST HAR NESS CON NEC TION
30 dB min.
Attenuator
· En sure the ELT is “OFF”.
· Measure the cur rent with the am meter.
The mea sured cur rent should be 0
microamps (uA) and less than 1 uA.
“ON” State Cur rent Mea sure -
ment:
NOTE: Cur rent draw dur ing this test may
exceed 3.5 Amps dur ing the 406.028
MHz burst. En sure the am me ter is set on
the ap propriate range to ac com mo date
this level of cur rent.
· Activate the ELT.
· The mea sured steady state cur rent
should not ex ceed 165 milliamps (mA).
When the 406.028 MHz mod ule is on
(generating the 406.028 MHz burst) the
current may ex ceed 3.5 Amps.
· Turn the ELT “OFF”.
· Disconnect the test har ness 611-0024.
· Reconnect the 2-pin mod ule power har -
ness.
· Reinstall the bat tery pack as de scribed
in Sec tion 4.3.4
4.3.13 (Step 5h) Ver ification of
Dig i tal Mes sage
Set up the equip ment as shown be low:
Activate the ELT and al low the ELT to
transmit 2 to 3 sec onds but not more
than 5 sec onds. The SARSAT Bea con
Tester will re ceive the “test mes sage”
transmitted at turn off. If the 406.028
MHz os cil la tor is not warmed up and sta -
bilized, a “BAD FRAME” mes sage may
oc cur, which could be con strued as a
problem when, in fact, the mes sage was
gen er ated be cause the os cil la tor had not
warmed up. If a “BAD FRAME” is re -
ceived, re peat the ac ti va tion and turn off
pro ce dure again. For all test ing of the
406 MHz out put, only the “test mes sage”
that is trans mit ted at turn off is re quired
to ver ify the ELT func tion. The test mes -
sage con tains all the in for ma tion con -
tained in the ac tual dis tress mes sage
ex cept po si tion data and there is a spe -
cial dig i tal test pre fix that tells the
COSPAS/SARSAT sat el lites to ig nore the
mes sage.
NOTE: If check ing the lat itude/longitude,
en sure that the air craft’s nav igation sys -
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DESCRIP TION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL(19)
