ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-2 (453-5000), C406-2HM (453-5001)
570-5000 Rev. U
Company Confidential
25-62-11
Page 29 of 66
6)
Verify in each case that the ELT activates via G-switch trigger as indicated by the flashing LED. An
auxiliary receiver set to 121.5 MHz should be used to detect the ELT signal.
7)
Reset the ELT after each activation by toggling the ON/OFF switch to ON and then to OFF to reset
the ELT.
SUBTASK 25-62-11-750-003
H.
Performance Testing Setup
NOTE:
The ELT software routine logs battery life in 30-second increments. A minimum of 30
seconds is added to the battery usage total each time the ELT is activated and de-
activated. If the ELT is left activated beyond the first 30 seconds, additional time is
added in 30- second increments.
NOTE:
Careful planning of the performance tests is necessary to avoid activating the ELT
more than necessary. Plan the performance testing in a manner that allows tests to
be run concurrently and test equipment settings to be quickly switched from one test
to another. By doing so, the three-minute warm-up requirement can be eliminated
from a number of tests and battery run time minimized to a large extent.
1)
Place the ELT in a container or screen room capable of substantially attenuating RF signals, or the
transmitter power output shall be connected to a suitable dummy load to minimize radiation.
2)
Use the ELT’s own battery pack as the power source for
these measurements. An alternate power
source can be used where lengthy servicing, other than the performance tests, is anticipated.
3)
Ensure that adequate attenuation rated for 406 MHz is installed between the ELT antenna output and
the measurement equipment to prevent damaging input circuitry, if required. At a minimum, the
attenuator should be rated at 30 dB, and 5 watts for a ½-second duration as shown in Figure 9.
Figure 9 Performance Testing Equipment Setup
SUBTASK 25-62-11-750-004
I.
121.5 MHz Frequency Measurement
–
Item 5a
1)
Connect the measuring device, referring to SUBTASK 25-62-11-750-003 on page 29.
2)
Activate the ELT by placing the control switch in the “ON” position.
3)
Wait three minutes.
4)
Perform SUBTASK 25-62-11-750-005 during the three-minute waiting period.
5)
Measure the frequency after the three-minute waiting period. The frequency must be within the
tolerance specified in Table 3 on page 23.
NOTE:
If the 121.5 MHz carrier frequency is within specified tolerance, the 243.0 MHz
frequency will also be within tolerance.
SUBTASK 25-62-11-750-005
J.
Audio Modulation Check
–
Item 5b
1)
Perform this check in conjunction with SUBTASK 25-62-11-750-004 on page 29.