Olson Technology OTM-3000-HR User Manual

OTM-3000-HR

FREQUENCY AGILE - HIGH RESOLUTION

TELEVISION MODULATOR

INSTRUCTION MANUAL

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025-000258 REV B 8/23/01

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1) INTRODUCTION

The OTM-3000 HR is a frequency agile F .C.C. compatible television modulator that provides the ability of
channel selection from 41.25MHz through 445.25MHz in lMHz increments. All channels are selectable by
front panel DIP switches, including F .C.C. offsets of +12.5KHz and +25KHz.

The OTM-3000 HR high resolution modulator used with companion OTD-2000 HR high resolution demodu­lator provides video bandwidth to 9.5MHz with carrier spacing as close as 12MHz. No audio capability is
provided.

The OTM-3000 HR offers excellent input sensitivity and high output level, typically +60dBmV . Also, this unit
has very high out-of-band carrier to noise ratio (>80dB) which allows virtually an unlimited number of
modulators to be combined without the need for external bandpass filters. The OTM-3000 HR has low
power consumption (14 watts @ 115 VAC) for reliable long term operation.

OTM-3000-HR

FREQUENCY AGILE - HIGH RESOLUTION

TELEVISION MODULA TOR

2) FREQUENCY SELECTION

Frequency selection is made by properly setting the two 8-position switches to the corresponding code.
Select the desired frequency code from T able #1 or the code card supplied with the unit, then set the DIP
switches from left to right.

The code card list standard TV channels. If these are used, select non-adjacent channels for spacings no
closer than 12MHz.

T able #1 is a listing that shows the binary code for all tunable frequencies from 41.25MHz to 445.25MHz in
1MHz steps. Set each DIP switch as indicated.

3) F .C.C. OFFSET SELECTION

Each channel listed on the code card has an “OFFSET CODE” number in either the left or right hand column.
“OFFSET CODE” #1 corresponds to 0KHz offset, Code #2 is 12.5KHz, and Code #3 corresponds to
+25KHz offset.

T o select the desired offset, simply set properly the 4-position DIP switches to the corresponding of fset
code as shown in Figure #1.

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3) F .C.C. OFFSET SELECTION

Each channel listed on the code card has an “OFFSET CODE” number in either the left or right hand column.
“OFFSET CODE” #1 corresponds to 0KHz offset, Code #2 is 12.5KHz, and Code #3 corresponds to
+25KHz offset.

T o select the desired offset, simply set properly the 4-position DIP switches to the corresponding of fset
code as shown in Figure #1.

Figure 1

OFFSET SELECT CHAR T
OTM-3000 HR MODULA T OR

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4) F .C.C. OFFSET FREQUENCIES

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