SDR-OMNI Avionics Test Set User Manual
Revision B 6 June 2023 Page 89
5.9.2 121.5 MHz and 243 MHz Audio Siren Test
After receiving the 406 MHz data burst, select the 121.5 MHz tab. This will retune the receiver to 121.5 MHz and
allow the user to listen to the audio on the SDR-OMNI headset. The unit will measure and display the received RF
frequency, output power, and AM modulation percentage.
If the ELT also transmits on 243 MHz, select the 243 MHz tab, listen to the audio on the headset, and observe the
frequency, power, and modulation measurements at 243 MHz.
CAUTION
After testing an ELT, immediately take it out of the TEST mode to avoid
transmitting after the allowed test window of 0 to 5 minutes after the
hour. Otherwise, SAR (Search and Rescue) activities may be initiated by
the civil authorities.
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