Cellular (Tx/Rx) Led Indicator; Signal Strength And Quality; Signal Strength - Campbell CR300 Series Product Manual

12.3 Cellular (TX/RX) LED Indicator

When the data logger is powered, the cellular LED will turn on according to cellular modem
communications states:
Off: Cellular modem off, insufficient power, or failure to establish a connection with the
l
provider (periodic retries will occur).
Solid: Cellular modem is powering up and attempting to establish a connection with a
l
provider.
Quick Flashing (approximately 1 second duration): Indicates successful network
l
registration.
Flashing: Flashes with network activity.
l

12.4 Signal strength and quality

Both signal strength and quality contribute to successful cellular data communications. The
factors that influence signal strength and quality include but are not limited to:
proximity to the cellular tower
l
tower load
l
competing signals
l
physical barriers (mountains, buildings, vegetation)
l
weather
l
Because signal strength and quality can vary due to many factors, they may not give a true
indication of communications performance or range. However, they can be useful for activities
such as:
determining the optimal direction to aim a Yagi antenna
l
determining the effects of antenna height and location
l
trying alternate Yagi antenna (reflective) paths
l
seeing the effect of vegetation and weather over time
l

12.4.1 Signal strength

Signal strength is how strong the received signal is. The closer your CR300-CELL is to the cellular
tower, the more signal the antenna will pick up. Signal strengths are lower the farther away from
the tower the CR300-CELL is.
For 3G networks, signal strength is reported as RSSl (Received Signal Strength Indicator). For 4G,
it is RSRP (Reference Signal Received Power).
12. Cellular communications option 50