Olson Technology OTM-3000-I, Instruction Manual

025-000137 REV B

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OTM-3000-I

FREQUENCY AGILE TELEVISION MODULATOR

PAL I STANDARD

1)  INTRODUCTION

The OTM-3000-I is a frequency agile television modulator with an output frequency range of 48.00MHz
through 445.25MHz. Frequencies are selectable in 1/4 MHz increments by front panel DIP switches. A rear-
panel toggle switch selects between ranges of 48.00 through 418.25  MHz and 418.50 through 445.25 MHz.

Front panel controls allow easy adjustment of video and audio modulation levels as well as RF output and aural
carrier levels. LED’s indicate overmodulation of the visual or aural carriers.

The OTM-3000-I offers excellent input sensitivity and high output level, typ60dBmV.  Also, this unit
has very high out-of-band carrier to noise ratio (>77dB) and uses SAW I.F. filtering, which allows virtually an
unlimited number of modulators to be combined without the need for external bandpass filters.  The OTM-
3000-I has low power consumption (14 watts @ 240 VAC) for reliable long term operation.

2)  INSTALLATION

Mount the OTM-3000-I in a standard equipment rack or equivalent as required. It is suggested that blank
spaces equivalent to a single unit height be provided above and below the modulator to allow adequate cooling
air to circulate.

The OTM-3000-I is configured for 240 VAC input powering. The color coding of the wires in the line cord
is to European standards although the plug is a USA type. The plug can be changed to a proper type (Be
sure to observe proper color code connection) or an adapter may be utilized.

3)  CHANNEL SELECTION

Channel selection is made by properly setting the tow 8-position DIP switches to the corresponding frequency
code.

To set the unit for a given frequency, select the desired frequency code from the list of frequency codes at the
end of this manual. Remove the small cover from the front panel under “CHANNEL SELECT” and set the two
8-position DIP switches from left to right (See figure 1).

The OTM-3000-I has an output frequency offset feature which is not required in PAL I applications. It is
mentioned here for reference only. Fixed offsets are selected by the last 3 right hand positions of right hand
switch. Leave this switch in the 0 KHz offset position as illustrated below.