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Real-time Detected Signal
Peak Detected Signal
Minimum Detected Signal
Band Noise Floor
Radio v3.x CCA Threshold
Radio v4.0 CCA Threshold
Examples
This shows a good RF environment. The Band Noise Floor is low and there are no red traces indicating that there
are plenty of signal free gaps to enable T24 to transmit. There is traffic across the whole band with higher signal
traffic between channels 11 to 15, but there is nothing that would affect T24 operation.
Mantracourt Electronics Limited
The white trace shows the real-time level of detected signal. On its own this
information only really indicates where other radios are operating. T24 works fine
with other transmissions but you may want to stay away from channels that have
a lot of activity when there are other quiet channels available.
The shaded background shows the peak signal detected across the band. This is
more useful than the real-time trace because, over time, this build a picture of
where the traffic has the highest power.
The red trace is very important and shows the minimum signal level detected
across the band. In a good, quiet RF environment these red traces will not be
visible but where there is a high level of broadband noise or very high amounts of
radio traffic you may see channels that show red areas. As long as these remain
below the CCA (Clear Channel Assessment) thresholds for the T24 radio modules
deployed (<=v3.x or >=v4.0) the T24 radios will still operate but given the choice
select a channel that does not show a high minimum signal level.
As levels start to increase above -95db this will start to reduce maximum
achievable radio range.
This indicates the lowest signal level across the entire band. Usually this will be off
the bottom of the chart but when this is visible it can indicate underlying issues
with the environment that could affect the T24 radio operation. As levels start to
increase above -95db this will start to reduce maximum achievable radio range.
This orange dotted line indicates the signal level at which the version 3.x (and
below) radio firmware will not transmit. Any signals detected larger than this level
will stop the module from transmitting. Usually this is not a problem as T24 radio
works in harmony with other radio systems and will transmit in the gaps between
other radio transmissions. However, if the Minimum Detected Signal is close to, or
above, this level then the T24 radio system will cease to function.
Version 4.0 radio modules have a revised CCA threshold to allow them to work
better in high noise RF environments.
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T24 Telemetry User Manual
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