ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
Page 31 of 70
25-62-03
Figure 8 Performance Testing Equipment Setup
SUBTASK 25-62-03-750-004
I.
121.5 MHz Frequency Measurement
–
Item 5a
1)
Connect the measuring device, referring to SUBTASK 25-62-03-750-003 on page 29.
2)
Activate the ELT by placing the control swit
ch in the “ON” position.
3)
Wait three minutes.
4)
Perform
Error! Not a valid bookmark self-reference.
during the three-minute waiting period.
5)
Measure the frequency after the three-minute waiting period. The frequency should be within tolerance
specified in Table 3 on page 24.
NOTE: If the 121.5 MHz carrier frequency is within specified tolerance, the 243.0 MHz
frequency will also be within tolerance.
SUBTASK 25-62-03-750-005
J.
Audio Modulation Check
–
Item 5b
1)
Perform this check in conjunction with SUBTASK 25-62-03-750-004 above.
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 25-62-03-750-006
K.
121.5/243.0 MHz Power Output Measurement
–
Item 5c
1)
Connect the measuring device, referring to SUBTASK 25-62-03-750-003 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 for 121.5 MHz. The amplitude must be within the minimum specified for
121.5 MHz in Table 3 on page 24, at the terminal output.
5)
Change to 243.0 MHz and repeat the procedure for 243.0 MHz.
SUBTASK 25-62-03-750-007
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 25-62-03-750-003 on page 29.
2)
Activate the ELT, if necessary, by placing the control switch in the “ON” position.