Details of the webcam system
A conventional 0.1 lux sensitivity tv camera with a 25mm focal length, f 2.5, 13.3 degree telephoto lens is mounted in a weatherproof enclosure on a pole about 30 metres from the gate. The analogue tv signal is transmitted about 400 metres over standard multicore telecom cable (not coax) using video adaptors at each end to a video-to-USB adaptor.
The camera enclosure is not heated so sometimes condensation on the enclosure window can result in the image being rather blurred.
Also, the camera can’t cope with the high contrast in illumination that results from bright sunlight at low angles (early morning and late evening). Similarly, in bright sunlight specular reflections from the river and the metal gate can play havoc with whatever automatic brightness control there is in the camera.
The webcam software is from Willing Webcam .
No image? There are many possible reasons. My computer may be misbehaving, there could be an electrical power disruption or the telephone lines may be down or my ISP or the web server may be playing up. All have happened and all are likely to happen again.