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5.
Miscellaneous
5.1
Audio Volume
The audio system is fitted with an Automatic Gain Control (AGC) which in-
creases the amplification when the microphone is picking up little sound, and
decreases it when it picks up more noise. In quiet situations, this results in high
gain, and can lead to the pick up of some hum.
We suggest you set the volume on your TV to a level where, in quiet conditions,
any background noise or hum is barely audible, and is not intrusive. When the
microphone starts to hear the sounds from the wildlife, the AGC will eadjust to
ensure that you hear their sounds above the level of the background noise.
5.2
Transmission Range
The Transmitter and Receiver have a nominal range of 100 metres.
The actual distance achieved will vary depending on atmospheric conditions, the
position and type of nearby obstacles (such as walls, trees, or metal objects) and
the state of the battery (if running on battery).
Moving the Receiver a few centimetres can sometimes make a big difference to
the strength of the signal. To obtain the best reception, we suggest you move the
Receiver around to find the best location by trial and error.
5.3
Pictures at Night
At night, or when completely dark, the only source of light for the Camera will be
the Infra Red lights fitted on the camera. Under such conditions, the camera will
give an image which consists of shades of grey, just like a black and white pic-
ture. This is perfectly normal. We use infra red lights at night so that you can
continue to see a picture, but, because birds cannot see infra red, their natural
sense and rhythms of day and night are not affected.
Because some TVs have different sensitivity to black and white, you may need to
adjust the brightness of the picture at night to get a better picture.
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