Transmissions from the Modem consist of short periods of high current draw conforming to the
following characteristics:
Length of transmission for sending a 192 byte packet to
space. Actual length may be shorter with a smaller packet
size
Total amount of energy required for 1 transmission to
space (192 bytes), when using 3.3V
When sending multiple messages, this is the minimum
amount of time that will pass before the Modem will
attempt another transmission
Table 10: Sample Modem transmission characteristics for sending a user payload of 192 bytes. Modem provided with
3.3V input.
Other electrical characteristics of the Modem can be found below in Table 11:
Maximum power at antenna connector
Sum total of all capacitance
Sum total of all inductance
Table 11: Other electrical characteristics for the Modem
November 2021 Swarm M138 Modem Manual - Rev 1.00 17/77
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