Received background noise signal strength in dBm for open channel
(integer).
For reliable operation, this value should consistently be less than (more
negative) than -93 dBm:
rssi_background = -90 dBm Bad (not likely to work)
rssi_background = -93 dBm Marginal
rssi_background = -97 dBm OK
rssi_background = -100 dBm Good
rssi_background = -105 dBm Great
Received signal strength in dBm for packet from satellite (integer)
Signal to noise ratio in dB for packet (integer)
Frequency deviation in Hz for packet (integer)
Date and time (UTC) of received packet
Device ID of satellite heard (hexadecimal)
Notes:
<rate> is a value between 1 and 2147483647 (2
31
-1). It will be the number of seconds in
between each message. If <rate> is 0, no messages will be sent, and no packets received
from a satellite will be displayed.
For reliable performance, the noise floor can be measured with an antenna connected to the
device in the final built-up configuration. The rssi_background value reported by $RT should
be less than (a more negative number) than -93 dBm. If the rssi_background noise floor is
more than (a less negative number, e.g. -88 dBm) -93 dBm, then the customer should relocate
the device to a different location, reconfigure the device ground plane, and also check that their
DC-DC power supplies on their own PCB are not injecting RF background noise into the device.
November 2021 Swarm M138 Modem Manual - Rev 1.00 65/77
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