CB-Monitor

High speed long range system consisting of a central PC-controlled base station with up to to 4 outstations, each with 3 analog inputs, 2 digital inputs and 1 digital output. Provision is made for scaling and calibration of analog sensors. Outstations can be automatically polled at user defined intervals from every 5 minutes to 12 hrs. Data can be saved to a text file for later retrieval. High or low alarm values can be set and adjusted to enable a warning signal to be sent over a CB radio channel.

Graphical visualisation of all data is available and can be rescaled and replotted in real time.
Communication between base station and outstations is by spread spectrum frequency hopping signals at 900MHz using 1 W radio modems.
Data can be transmitted at 9600bps (long range) or 115,200 bps (reduced range).
Transmission of digital images in near real time is possible.
Indoor or urban range with a standard 3dB antenna is around 1km and outdoor range (line of sight) with same antenna is about 20 km.
Using high gain directional antennas the range can in theory be extended up to 60 km.
The central base station is equipped with a mains powered 1.5W CB radio which transmits a warning signal when an alarm condition has been reached.
All outstations can be powered by 6 Volt solar panels with sealed lead-acid battery backup.

The screenshots below illustrate the main control page and graphical display for one station