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Adjust the reference amplitude to place the peak of the carrier slightly above
the top graticule fine.
Enable the "fine" amplitude adjustment. Set the carrier peak to exactly the
top of the reference line.
Read the displayed amplitude.
Repeat for the 243.0 MHz harmonic (change the "Center Frequency" to
243.0 MHz. All other settings remain the same).
The minimum allowed amplitude on 121.5 MHz and 243.0 MHz is 20 dBm,
after 3 minutes of operation.
3.5.2.2
406.028 MHz Power Output:
Note
:
The power output is approximately (35.34 – 38.18) dBm. Ensure adequate attenuation
is inserted in-line between the ELT's 406.028 MHz output and the input to the
spectrum analyzer to protect the analyzer's input circuitry.
Connect the equipment as shown below:
Set the Spectrum Analyzer as follows:
Center freq: 406.028 MHz
Span: 1 MHz
Resolution bandwidth: 1 MHz
Vertical display: 10dB/Div
Sweep: Auto
Peak/Avg: Peak
Reference level: 30 dBm
Time/Div: 20ms
Max hold: On
Attenuator (as required) on Input
Turn the ELT on and wait approximately 50 seconds for the 406.028 MHz transmitter
to turn on (transmitter sends out first signal at 50 seconds then every 50 seconds
thereafter). Determine the power output from the stored waveform.
The 406.028 MHz power output should be (35.34 – 38.18) dBm (3.42W min to
6.58W max), after 3 minutes of operation.
ELT BNC
Connector
Applicable
attenuator
Spectrum
Analyzer
Summary of Contents for AK-451 Series
Page 23: ...23 Figure A Front view of ELT Figure B 3 D view of ELT ...
Page 32: ...32 Figure 3 Mounting Tray with Clamp Holder for ELT AF AP ...
Page 37: ...37 Figure 6 Whip Antenna Model AK 451 017 1B ...
Page 39: ...39 Figure 2 1 2 ELT with mounting tray holder and adapter tray ...
Page 42: ...42 Figure 7 1 Rod Antenna AK 451 017 2A 1 ...
Page 45: ...45 Figure 8 Blade Antenna AK 451 017 3A ...
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Page 51: ...51 Figure 11 Remote Audio Buzzer Monitor P N 451018 ...
Page 79: ...79 Figure 18 ELT Front Panels Main Unit and Remote Unit ...
Page 84: ...84 ELT S Top Label Figure 19 Automatic Portable ELT AP with integral antenna Survival ELT S ...
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Page 138: ...138 Table 1 List of all available Protocols ELT Non Location Protocols ...
Page 139: ...139 ELT Location Protocols User Location Protocols ...
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Page 223: ...223 Japan Civil Aviation Board Approval ...
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Page 230: ...230 APPENDIX K MATERIAL SAFETY DATA SHEET FOR BATTERY ...
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