User's Manual

Page 6 Lotek Biotracker Receiver User’s Manual
Top Panel Controls
This section explains in detail the function of individual keys.
Power
Hold this key down for one second or more to switch the receiver on or off.
When the receiver is switched on it returns to the state it was in when it was
last switched off. It remembers mode, digital gain level, step size and
frequency or channel. All memory contents are also retained.
LCD Backlight
This key switches the LCD back-light on and off. The back-light increases
receiver power consumption (and reduces battery life) by around 50%. To
conserve power if the light is accidentally switched on, the light switches off
automatically after about 4 minutes.
Up/Down Arrows
These keys are used to change frequency or channel, depending on which mode
the receiver is in.
When in Frequency Mode (‘F’ displayed in bottom right of LCD), the frequency
displayed on the bottom row of the LCD is changed in either 0.1 kHz or 1kHz
steps. Pressing the key marked [.000/.0000] toggles between the step sizes
(tuning resolution).
In Channel Mode (‘C’ displayed in bottom right of LCD), the arrow keys step through
occupied channels displayed on the bottom row of the LCD. Empty channels are not
displayed. After pressing [STORE], the up/down keys step through all channels
displayed in the top row of the LCD, including empty ones.
In Scan Mode (two opposing curved arrows displayed in bottom right of LCD), and when
scan interval is displayed in the top row of the LCD, the up/down keys change the scan
interval. After setting the scan interval, the up/down keys step through occupied
channels. Empty channels are not displayed.
Mode Selection
This toggles between Frequency Mode and Channel Mode. When returning from
Channel Mode to Frequency Mode the frequency displayed is that of the last
channel selected. The default tuning resolution (step size) is set to 0.1 kHz.
Tuning Resolution
This key toggles between displaying the frequency to the nearest 0.1 kHz (four
decimal places) or to the nearest 1 kHz (three decimal places). It operates only
in Frequency Mode.
Digital Gain/Volume Control Keys
The keys with loudspeaker symbols control the radio frequency (RF) gain and
audio gain (volume) of the receiver. The upper key increases gain and the
lower one reduces it. The gain level is indicated by the number between 0 and
99 in the bottom right of the LCD, immediately before the mode symbol.
These are known as ‘digital gain keys’ because they set gain in discrete steps.
Gain can also be controlled using a knob on the front of the receiver. The knob controls
gain in an analogue fashion within the limits set by digital keys gain (i.e. up to the level
shown on the LCD). It does not change the number displayed in the LCD. Setting
the gain to 99 (maximum) using the digital keys enables the knob to cover the entire
gain range.