Olson Technology OTM-4000 - Manual (Page 2)

025-000331 REV B Page 2
OTM-4000
FREQUENCY AGILE 750MHz
F.C.C. COMPATIBLE TELEVISION MODULATOR
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.
SAW filtering and Olson Technology 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.
2) LOCAL CONTROL OF THE OTM-4000
A.) FRONT PANEL ADJUSTMENTS:
Video 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 PANEL 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. To 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.
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.