Frequencies And Power Output - Vivax vLoc-9800 User Handbook Manual

5 Loc-10Tx Transmitter
5.2.5

Frequencies and Power Output

The Loc-10Tx transmitter is supplied with a predefined set of transmit frequencies.
Standard frequencies are:
982Hz – 10 watts, 5 watts, 1 watts
•
9.80 kHz – 10 watts, 5 watts, 1 watts
•
83.1 kHz – 1 watt
•
As with most manufacturers the clamps and induction antennas are tuned to specific frequencies, and do
NOT work over the complete range.
Frequencies are selected by pressing the "f" pushbutton which toggles through the available frequencies for
the selection mode. The frequency is automatically selected if you don't toggle past it within 2 seconds. The
frequency is shown on the display.
The output current is shown in large characters on the display – to increase or reduce the power output press
"+" or "-". The vertical bar graph at the bottom of the display indicates which of the four current output steps is
being used. If the transmitter can supply the requested current, the bar will turn black. If the bar does not turn
black, improving the ground connections or wetting the ground where the earth stake in positioned, may help.
However, it may not be able to achieve the current setting requested because the impedance of the line is too
high for this setting. If this happens it is best to select a setting that has a black bar, this will ensure a stable
output.
The current being transmitted will be limited by the impedance of the cable, therefore it is not unusual to
increase the output level, but see no increase in the current displayed. This is not a fault with the transmitter.
The transmitter will always revert to first level output when switched on – this is a power saving feature – in
most circumstances this output level is sufficient. Increasing the output power unnecessarily will reduce the
battery life unnecessarily. All other settings remain the same as the last setting used.
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