Olson Technology OTD-3000-S User Manual

OTD-3000-S

FREQUENCY AGILE

TELEVISION DEMODULATOR

(WITH SUB-BAND INPUT CAPABILITY)

INSTRUCTION MANUAL

Phone:

E-Mail: [e-mail]

025-000097 REV E 6/4/01

[phone]
[phone]

Fax:

[phone]

www.olsontech.com

FREQUENCY AGILE TELEVISION DEMODULATOR

1) INTRODUCTION

The Olson Technology OTD-3000-S is a frequency agile television demodulator that will select any VHF or cable channel
in .25MHz increments from channel T7 (7.00MHz) to channel 86 (547.25MHz). SAW filtering is used for excellent
adjacent channel operation.

The OTD-3000-S provides 2 outputs for video (each at 1 Volt), audio (balanced) at .5 Volt, MPX audio (unbalanced) at .5
Volt, 4.5 MHz at > +35dBmV, and unfiltered I.F.. BTSC stereo and SAP signals are available at the MPX and 4.5MHz
outputs. This unit is also capable of providing a composite video output (video with 4.5 MHz subcarrier present). Power

consumption is 10 Watts at 115 VAC.

2) 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 the left switch and the first 5
positions on the right switch. Positions 6, 7, & 8 on the right switch are not used.

OTD-3000-S

WITH

SUB-BAND INPUT CAPABILITY

Look up the switch codes for the channel you want to demodulate on the code card attached to the input channel select
cover plate, or on pages 4-7 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.

Switch codes for frequencies not listed may be computed using the information on page 10.

3) INPUT CONNECTION

Connect the signal to be demodulated to the RF input on the rear of the OTD-3000-S. For optimum quality, the input
signal level should be a minimum of +10dBmV and may be as high as +18dBmV. The unit will function with input levels
below +10dBmV, 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 output at input levels below approximately

-30dBmV.

4) REAR PANEL 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.

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 (no de-emphasis, and with BTSC stereo and SAP signals present) is available at the unbalanced MPX
output F-fitting. This output will provide approximately .5 V into 75 ohms on program peaks.

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D) 4.5MHz audio subcarrier (with BTSC and SAP information) is available at the 4.5MHz output F-fitting. This
output is typically >+35dbmV.

E) Composite video (video with 4.5MHz subcarrier present) is available at the video output F-fittings if the composite
switch is turned on. Leave this switch off if 4.5MHz subcarrier is not required on the video output.

5) MISCELLANEOUS

The OTD-3000-S is equipped with a 0.5A slo-blo fuse. For safety, and to maintain proper performance of the unit, please

replace only with an equivalent fuse.

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