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Swarm M138 Modem

Transmits and receives 2-way data via Swarm’s satellite network.
Designed to be embedded into a third-party IoT device.
Data delivered via a REST API or Webhook to any cloud service.

An annual Swarm data plan is required to utilize the Swarm network.


Dimensions51.0 x 30.0 x 5.3 mm
Mass9.6 g
ComponentsGPS, VHF radio with integrated T/R switch
U.FL connectors for GPS and VHF antennas
ARM Cortex-M4 processor
Indicator LEDs
CMOS serial UART interface
SensorsOnboard GPS (lat/lon/alt)

PowerSleep mode: 3.3 V, 80 uA (max)
Receive mode: 3.3 V, 26 mA (typ), 40 mA (max)
Transmit mode: 3.3V, 850 ma (typ), 1000 mA (max)
EnvironmentOperational: -40 C to +85 C
Storage: -40 C to +85 C
Module protocol
Data sent to the Modem should be formatted into a hex-ascii string.
Two-letter NMEA-like commands are sent to a 3.3V CMOS serial UART.
Data rate1 kbps
Frequency137-138 MHz (downlink)
148-150 MHz (uplink)