ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ME406 (453-6603), ME406HM (453-6604)
Page 31 of 72
Mar 19/15
25-62-30
SUBTASK 25-62-30-750-006
K.
406 MHz Frequency Measurement – Item 5d
CAUTION: POWER OUTPUT IS APPROXIMATELY 37 DB (5 WATTS). BE SURE ADEQUATE
ATTENUATION IS INSERTED IN-LINE BETWEEN THE ELT ANTENNA OUTPUT AND THE
MEASURING DEVICE TO PROTECT THE INPUT CIRCUITS OF THE MEASURING DEVICE.
1)
Connect the measuring device, referring to SUBTASK 25-62-30-750-002 on page 29.
2)
Activate the ELT, if necessary, by placing the control switch in the “ON” position.
3)
Wait three minutes.
4)
Measure the frequency. Measure the frequency after the three-minute waiting period. The frequency
must be within the tolerance specified in Table 3 on page 24.
NOTE:
The exact 406 MHz frequency used is printed on the ELT product label.
SUBTASK 25-62-30-750-007
L.
406 MHz Power Output Measurement – Item 5e
CAUTION: POWER OUTPUT IS APPROXIMATELY 37 DB (5 WATTS). BE SURE ADEQUATE
ATTENUATION IS INSERTED IN-LINE BETWEEN THE ELT ANTENNA OUTPUT AND THE
MEASURING DEVICE TO PROTECT THE INPUT CIRCUITS OF THE MEASURING DEVICE.
1)
Connect the measuring device, referring to SUBTASK 25-62-30-750-002 on page 29.
2)
Activate the ELT, if necessary, by placing the control switch in the “ON” position.
3)
Wait three minutes.
4)
Read the displayed amplitude of the 406 MHz burst that follows the three-minute wait period. The
amplitude must be within the minimum specified for 406 MHz in Table 3 on page 24, at the output
terminal.
5)
Deactivate the ELT by placing the control switch in the “ARM” position.
SUBTASK 25-62-30-750-008
M.
Current Draw Test – Item 5f
CAUTION: EXERCISE EXTREME CAUTION TO AVOID CAUSING A SHORT CIRCUIT CONDITION,
WHICH WILL BLOW THE FUSES IN THE BATTERY PACK. THIS TEST SHOULD ONLY BE
PERFORMED BY AN EXPERIENCED TECHNICIAN/MECHANIC.
CAUTION: ALL “ON” STATE CURRENT MEASUREMENTS MUST BE MADE WITH THE RF OUTPUT (I.E.,
ELT ANTENNA CONNECTOR) LOADED WITH 50 OHMS RATED FOR 5 WATTS. EITHER A
RESISTIVE LOAD OR EQUIPMENT WITH 50 OHM IMPEDANCE PADDED WITH A 10 DB/5
WATT ATTENUATOR. REFER TO SUBTASK 25-62-30-750-002 ON PAGE 29.
CAUTION: ACR ELECTRONICS DOES NOT RECOMMEND MEASURING THE 406 MHZ BURST, WHICH
DRAWS UP TO 5 AMPS OF CURRENT; HOWEVER, THE AMMETER USED TO MEASURE THE
STEADY STATE CURRENT OF THE 121.5 MHZ TRANSMISSION MUST BE CAPABLE OF
WITHSTANDING A 5 AMP CURRENT DRAW OR MUST HAVE THE READING SCALE
ADJUSTED ACCORDINGLY. KEEP IN MIND THE ELT TRANSMITS A 406 MHZ BURST WHEN
THE ELT IS RESET, IN ADDITION TO A 406 MHZ BURST APPROXIMATELY EVERY 50
SECONDS.
1)
Verify the ELT control switch is in the “ARM” position.
2)
Separate the battery pack from the ELT. See SUBTASK 25-62-30-050-001on page 40.
3)
Install test fixture 500-0057 in the power circuit. See Figure 9 Current Draw Test Setup.
