visualengineering.co.uk
Page 19
DropCam-SDR
Sept 2022
Status Tab - Spectra
1. The Spectra Displays
3. Interference
There are two displays labelled A and B which show the spectra being received on the two diversity
antennas of the node that is being interrogated�
In the above example there is a valid COFDM signal being received on Input A of -36dB� The second
antenna, Input B, is showing no signal� It can be assumed, therefore, that the second antenna is not
connected�
If the Interference button is selected the display shows the spectra when none of the nodes in the
Mesh are transmitting� This enables the user to look for interference on the system frequency that
is to be used� In a clean RF environment, with no interference, the user will see a spectra for both
inputs as shown above for Input B of -96dB�
There could be several nodes transmitting on the Mesh so we need to define which node we are
looking at� This is done with the radio buttons on the left side of the spectra display� In this example
there is only one node on the network, the CCTV Node� This is the one that has been selected�
2. Node Selection
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2
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