The Swarm M138 Modem transmits and receives data via Swarm’s satellite network. The modem is designed to be embedded into a third-party IoT device, and the data can be delivered via a REST API or Webhook to any cloud service.
|Quantity||Price (USD) – through March 31, 2022|
|Dimensions||51.0 x 30.0 x 5.3 mm|
|Components||GPS, VHF radio with integrated T/R switch|
U.FL connectors for GPS and VHF antennas
ARM Cortex-M4 processor
CMOS serial UART interface
|Sensors||Onboard GPS (lat/lon/alt)|
|Power||Sleep mode: 3.3V, 70 µA (max)|
Receive mode: 3.3V, 26 mA (typ), 40 mA (max)
Transmit mode: 3.3V, 1275 mA (typ), 1600 mA (max)
|Environment||Operational: -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.
|Bit rate||1 kbps|
|Frequency||137-138 MHz (downlink)|
148-150 MHz (uplink)
Q: How do I communicate with the Swarm M138 Modem?
A: The Swarm M138 Modem communicates via a standard 3.3V CMOS serial UART interface or a PC interface with a USB-to-serial converter.
Q: How do I transmit data using the Swarm M138 Modem?
A: When powered on, the Swarm M138 Modem will identify a signal from any of the Swarm satellites overhead, and automatically transmit queued user data.
Q: How do I integrate the Swarm M138 Modem into my product?
The M138 Modem is easy to integrate into any new or existing PCB design. The Swarm Modem uses a standard mPCIe 30mm x 51mm form factor for easy integration, firmware upgrades, and replacement.
Q: What antenna does the Swarm M138 Modem come with?
A: Each Swarm M138 Modem purchase includes a Swarm VHF antenna (22cm coiled ¼-wave with SMA-male connector) that is pre-tuned to our frequencies.
Q: Does the Swarm antenna require a ground plane?
A: For most applications, we recommend that the user supplies a 1/4λ (30 x 30cm) ground plane or 50cm long counterpoise wire to maximize transmission success with Swarm’s VHF antenna.
Q: Does the Swarm M138 Modem have any additional capabilities?
A: Yes! The Swarm M138 Modem has onboard GPS, temperature sensors, GPIO control, and several user commands. See the Swarm M138 Modem Product Manual for more in-depth information.
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