6.3 Antenna Debugging
To quickly verify the antenna connection to Modem:
1. Power on the Modem.
2. After bootup, issue $RT 1*17. The noise floor the Modem hears (in dBm) will begin
displaying at a rate of once per second.
3. While the Modem’s LED is blinking red rapidly (indicates it has not yet acquired a GPS
fix)
a. Touch the Modem’s antenna with your hand or with another object. The noise
floor measurement should noticeably change.
b. The Modem will not transmit until it has a GPS fix and it hears a Swarm Satellite.
There is no risk of the Modem transmitting during this procedure if the red LED is
blinking rapidly.
November 2021 Swarm M138 Modem Manual - Rev 1.00 31/77
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