Olson Technology OTD-3000-I User Manual

OTD-3000-I

FREQUENCY AGILE

TELEVISION MODULATOR

PAL I STANDARD

INSTRUCTION MANUAL

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1) INTRODUCTION

The Olson T echnology OTD-3000-I is a frequency agile television demodulator that will select VHF ,
UHF or cable channels from 48.25 to 855.25MHz. SA W filtering is used for excellent adjacent channel
operation.

The OTD-3000-I provides 2 outputs for video (each at 1 Volt), audio (balanced) at .5 Volt, MPX audio
(unbalanced, without de-emphasis) at .5 Volt, 6.0MHz aural subcarrier at > +35dBmV , and unfiltered I.F ..
This unit is also capable of providing a composite video output (video with 6.0MHz aural subcarrier
present). Power consumption is 10 W atts at 220 VAC.

2) INST ALLA TION

Mount the unit in a standard equipment rack and provide it with a source of AC power.

OTD-3000-I

FREQUENCY AGILE TELEVISION DEMODULATOR

P AL I ST ANDARD

For proper ventilation, it is desirable to allow an empty space above and below the unit in the rack. A space
the same height as the OTD-3000-I would be adequate. Try to avoid locations that are extremely hot or moist
or which have extreme temperature variations.

3) INPUT CONNECTION

Connect the signal to be demodulated to the VHF / UHF input on the rear of the OTD-3000-I. For optimum
quality , the input signal level should be a minimum of +5dBmV and may be as high as +20dBmV . The unit will
function with input levels below +5dBmV, but the signal to noise ratio will be degraded as the level is
lowered.

This unit incorporates a video squelch circuit that is set to cut off the video output at input levels below
approximately -30dBmV .

4) REAR P ANEL OUTPUT CONNECTIONS

A) Demodulated video is available at both of the video output F-fittings. The output level is internally set

for approximately 1V P-P for a fully-modulated video carrier when terminated in 75Ω.

B) Demodulated baseband audio is available at the two audio out screw terminals. This is a balanced

output that will easily drive a 600 ohm load and is internally set to provide approximately .5V P-P on
program peaks. Either terminal may be grounded for applications requiring an unbalanced output.

C) MPX audio (audio output without de-emphasis) is available at the unbalanced MPX output

025-000390 REV B

F-fitting. This output will provide approximately .5 V into 75 Ohms on program peaks.

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D) The 6.0MHz aural subcarrier is available at the 6.0MHz output F-fitting. This output is typically

>+35dbmV.

E) Composite video (video with the 6.0MHz subcarrier present) is available at the video output F-fittings

if the rear panel composite switch is turned on. Leave this switch off if the 6.0MHz subcarrier is not
required on the video output.

5) CHANNEL SELECTION

Remove the small cover plate on the front panel under “CHANNEL SELECT” to expose the two 8-position
DIP switches. Channel or frequency selection is accomplished by properly setting the eight positions on each
of these two switches.

A) ST ANDARD CHANNELS:

Look up the switch codes for the channel you want to demodulate on pages 6 and 7 in this manual.
A “0” indicates a switch position as down and a “1” indicates a switch position as up. Using the codes
shown for the channel you require, set the DIP switches according to the chart from left to right.

B) NON-STANDARD CHANNELS:

Switch codes for frequencies not listed may be computed using the information on pages 4, 5 and 6.

6) AFC OPERA TION

The OTD-3000-I has an AFC circuit which will hold the unit tuned to a selected channel should the source
channel drift in frequency . This feature is usually not required but may be activated by moving the 8th position
of the right switch to down (on).

7) SELECTION OF NON-LISTED FREQUENCIES

V ideo carrier frequencies between 48.25 and 855.25 in .25MHz steps may be selected by following the
procedure below .

The 16 positions of the two DIP switches behind the “CHANNEL SELECT” cover plate have specific
functions as shown in Figure 1 and noted below .

SW 2 is a 6 position DIP switch on the PC board just behind and left of the front panel DIP switches.
Remove top cover for access. Figure 1 shows SW 2 set for frequency ending in .25MHz. The chart shows
settings for other frequencies.

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