ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-1 (453-5002), C406-1HM (453-5003)
Page 30 of 67
Feb 28/2019
25-62-10
Figure 9 Performance Tests Equipment Setup
SUBTASK 25-62-10-750-004
I.
121.5 MHz Frequency Measurement
–
Item 5a
1)
Connect the measuring device, referring to SUBTASK 25-62-10-750-003 on page 29.
2)
Activate the ELT by placing the control switch in the “ON” position.
3)
Wait three minutes.
4)
Perform SUBTASK 25-62-10-750-005 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 25-62-10-750-005
J.
Audio Modulation Check
–
Item 5b
1)
Perform this check in conjunction with SUBTASK 25-62-10-750-004.
2)
Monitor 121.5 MHz on an AM receiver.
3)
Listen for the aural sweep tone on the receiver. The audio should “sound” like an ELT.
SUBTASK 25-62-10-750-006
K.
121.5/243.0 MHz Power Output Measurement
–
Item 5c
1)
Connect the measuring device, referring to SUBTASK 25-62-10-750-003 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. The amplitude must be within the minimum specified for 121.5 MHz in Table
3 on page 23 at the terminal output.
5)
Change to 243.0 MHz and repeat the procedure for 243.0 MHz.
SUBTASK 25-62-10-750-007
L.
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 25-62-10-750-003 on page 29.
2)
Activate the ELT, if necessary, by placing the control switch in t
he “ON” position.