6
SECTION 4
MAINTENANCE AND PROGRAMMING
A) Maintenance
No maintenance is required to keep the transmitter in top operating condition. If an
external cleaning appears necessary, use a soft, damp cloth and mild soap only.
B) Frequency programming
The transmitting frequency is user programmable via a set of 2 Hex switches that are
labeled « F1 and F2 » on the rear panel (All models).Your LX-75 is factory preset to
98.5 MHz when shipped.
1) From the Hex switches code table (page 8), select the appropriate Hex switch code
for your chosen FM frequency and set the hex switches accordingly.
Important: The LX-75SM models are equipped with an additional Bit switch that is
labeled « ST » that allows to broadcast in mono or stereo mode. Stereo mode is
activated when the ST switch is in ON position. Also included is an additional Bit
switch that is labeled « BB » that allows to add a bass boost of 6dB in the audio
spectrum contained between 0 Hz to 100Hz.Bass boost mode is activated when
the BB switch is in ON position.
Important notes :
1) The frequency range of the LX-75 series is 88.1MHz to 107.5MHz
2) If your application requires more than one LX-75, it is mandatory to leave some
space between the two chosen frequencies in a manner to avoid channel
scrambling or intermodulation products. Ex; If the first chosen FM frequency is 88.5
MHz then nearest the second chosen FM frequency shall be 89.1 MHz. The chosen
FM frequencies shall never interfere with local FM broadcast stations.
C) RF power level programming
With the help of the Hex switches labeled « P1 P2 » it is possible to digitally program
the RF output in increments of 5 miliWatts. Please refer to the Hex codes on page 9.
The power range of the LX-75 series is: 0 miliWatt up to 80 miliWatts. Your LX-75 is
factory preset to 80 miliWatts when shipped.
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