Olson Technology OTM-4000 User Manual

OTM-4000

FREQUENCY AGILE 750MHz

F.C.C. COMPATIBLE

TELEVISION MODULATOR

INSTRUCTION MANUAL

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1) INTRODUCTION

The Olson Technology OTM-4000 is a frequency agile, F.C.C. compatible television modulator. This
microprocessor-controlled unit is capable of operation on any frequency from 48MHz to 750MHz and output
frequency selection is possible in 0.0125MHz increments. Output frequencies may be selected in MHz or by
channel designation. Standard, HRC, IRC, or EIA channel plans may be specified. FCC offsets of +12.5KHz
and +25KHz are automatically provided depending on the plan and/or channel chosen.

An RF output level of +60dBmV (minimum) is possible over the operating frequency range of the OTM-4000.
SA W filtering and Olson T echnology system design factors insure an out-of-band carrier-to-noise ratio greater

than 80dB. This allows unlimited numbers of these units to be combined.
The OTM-4000 has many advanced features including a menu/button control system, front panel display of

channel and channel ID text, a manual or loss-of-video controlled auxiliary I.F . input with AGC, selectable
video AGC, external audio subcarrier input, configurable audio input, dual IF loops, BTSC compatibility ,
optional remote control, and more.

OTM-4000

FREQUENCY AGILE 750MHz

F .C.C. COMPATIBLE TELEVISION MODULATOR

2) LOCAL CONTROL OF THE OTM-4000

A.) FRONT P ANEL ADJUSTMENTS:

V ideo and audio modulation levels, video-to-audio carrier ratio, and the RF output level are adjustable
by means of slotted controls accessible through the front panel. There is also a control for the LCD
panel contrast which should be adjusted for proper viewing once the unit is installed.

See section 4 of this manual for more information on these adjustments.

B.) FRONT P ANEL MENU ITEM CONTROLS:

Most features of the OTM-4000 are configurable from the front panel by means of the menu/button
system which includes an LCD panel and 5 buttons. The LCD panel displays the menu(s) and the
currently-selected configuration or value.

The “UP”, “DOWN”, “LEFT”, and “RIGHT” buttons are used to move between menus, to select
configurations, and to change values. All items except tuning mode and channel number/frequency will
instantly change to match the display . A new tuning mode or channel/frequency takes effect only when
you press the “ENTER” button. T o make other changes permanent, press the “ENTER” button.

Note that when changing the output frequency , the unit’s digital synthesizer may become unlocked
momentarily resulting in operation on an undesired frequency until it re-locks. The OTM-4000 will
turn it’ s RF output off anytime the unit is in an unlocked state, thus preventing unwanted interference
when changing channels.

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As illustrated on page 5 below , there are two menu trees; the main menu tree (on the left) and the
sub-menu tree (on the right). The arrows indicate which buttons to press to move around the menus.
Review each menu and the information below to become familiar with the various functions.

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C.) CHANGING MENU ITEMS:

T o change a function or value, select the menu containing the item to change using the “UP”, “DOWN”,
“RIGHT”, and “LEFT” buttons. After selecting the correct menu, press the “RIGHT” button to change
a menu item. If part or all of the bottom row starts flashing, you can change that item.

If the entire bottom row flashes (most items), press the “UP” or “DOWN” button to change it. These
buttons have auto-repeat. For tuning or channel ID (NAME) values, only one character in the bottom
row will flash. The “LEFT” and “RIGHT” buttons select the position to change and the “UP” and
“DOWN” buttons change the value.

When you are through with the change (or if there is no change), pressing the “ENTER” button will
enable the displayed parameter or value, the change mode is exited, and the display will stop
flashing. If you do not press the “ENTER” key , the parameter will return to the original value after a
time-out of about 15 seconds.

3.) SOME MENU-SPECIFIC INFORMA TION

A.) Display of NAME and TUNING:

This is the normal (default) display and is the menu shown as the top left menu on page 5 of this manual.
Y ou can not make any change from this menu. The NAME is programmable from the NAME menu
and the tuning is programmable from the TUNING menu. The display will return to this default after
about 30 seconds of button inactivity

If the programmed TUNING MODE is CHAN, the display will be the channel number. If the
programmed TUNING MODE is FREQ, the display will be the frequency in MHz.

Note that if the TUNING MODE is changed from CHAN to FREQ, the LCD will display the
frequency of the previously-selected channel.

B.) IF INPUT:

This indicates the preferred choice of the normal IF source. A rear panel input or an automatic transfer
could switch to the AUX IF input.

C.) CHANNEL PLAN:

The CHANNEL PLAN determines the OTM-4000 output frequency for a selected channel number .
T ables at the end of this manual list these values.

Note that FCC offsets are automatically provided for the STD and EIA channel plans and that an
offset is applied to all channels in the IRC plan. The HRC channel plan provides no offsets.

D.) NAME:

This menu allows you to program the NAME that appears at the top of the normal (default) display .
Upper case and lower case letters as well as numbers and various symbols are available for use.

E.) COMMAND MODE, BAUD RA TE, and ADDRESS:

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These functions are only used when the OTM-4000 is configured with the optional remote control
feature.

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NOTE: Arrows indicate which keys to
press to move through menus

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