Olson Technology OTM-4870 User Manual

MODEL OTM-4870-P AL-B/G

FREQUENCY AGILE 870MHz

P AL B/G TELEVISION MODULA T OR

USERS MANUAL

Phone:

E-Mail: [e-mail]

025-000337 Rev . x1 10/30/02

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Fax:

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www.olsontech.com

RF

Frequency Range...................

RF Output Level....................

Accuracy/Stability................

Spurious Output....................

Out-of-Band C/N Ratio..........

Phase Noise...........................

Audio/Video Ratio.................

VIDEO

Baseband Input Level............

Video Performance................

Frequency Response..............

Video AGC............................

AUDIO

Baseband Input Level............

Intercarrier Stability...............

Audio Performance................

Frequency Response..............

Pre-Emphasis........................

Audio Subcarrier Input..........

48.25MHz to 865.25MHz
Selectable by front panel
touchbuttons by channel or
frequency in 12.5KHz incre­ments.
+61dBmV typical
±5KHZ
>60dBc (typical)
>80dB
>90dBc @ 10KHz offset

-12dB to -21dB below video
carrier level

.5 to 1.5 volts p-p (75Ω)
1V p-p @ 87.5% modulation
Differential Gain <3%
Differential Phase <2°
+1dB, 30Hz to 4.8MHz
On/Off front panel control

-10 to +10dBm, 600 Ω
balanced, Hi Z unbalanced
+1KHz
2% maximum THD (1%
typical)
50Hz to 15KHz, ±1dB
75 ìs NTSC, 50 ì s P AL, defeated
by internal jumper for BTSC
and SAP compatibility
+25dBmV to +45dBmV
@75 Ω

AUX. IF INPUT

Four Modes of Control.............

EXTERNAL FEATURES

Front Panel Controls................

Front Panel LED’s...................

Rear Panel Connectors.............

GENERAL

Power Supply...........................

Physical Size............................

Weight......................................

Power Consumption.................

Operating Temperature............

Loss of video to modulator, rear
panel closure screws for EAS
compatibility

Video/Audio modulation levels,
Audio to Video carrier ratio, RF
output level, LCD contrast
control, Push button menu
controls
RF on, AUX IF in use, Synthe­sizer unlocked, Video/Audio
over modulation

T ype “F” connectors for RF
output, RF test point, AUX IF
input, Video baseband input,
Video and Audio IF inputs/
outputs. Composite IF input/
output and Audio subcarrier.
Screw terminals for contact
closure/audio baseband

Universal 90 VAC to 240 VAC,
50 to 60Hz with IEC 320 power
connector

1.75” H x 19” W x 10” D
9 lbs.
24 Watts
0° C to 50° C

DUAL IF LOOPS

Video IF................................

Audio IF...............................

COMPOSITE IF LOOP

Video IF................................

Audio IF...............................

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+36dBmV @ 38.9MHz
(typical)
Adjustable -12dB to -21dB
relative to video carrier

+18dBmV @ 38.9MHz
(typical)
Adjustable -12 to -21dB
relative to video carrier

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OTM-4870-PAL-B/G

FREQUENCY AGILE 870MHz

P AL B/G TELEVISION MODULA T OR

1) INTRODUCTION

The Olson T echnology OTM-4870 is a frequency agile, P A L B/G television modulator . This microprocessor-controlled unit
is capable of operation on any frequency from 48MHz to 870MHz and output frequency selection is possible in 0.0125MHz
increments. Output frequencies may be selected in MHz or by channel designation.

An RF output level of +60dBmV (minimum) is possible over the operating frequency range of the OTM-4870.

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-4870 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, composite IF loop, BTSC compatibility and more.

The OTM-4870 up-converter section is a high performance tuner with excellent phase noise and frequency response that
exceeds DOCSIS and CMTS specifications.

2) CONTROL OF THE OTM-4870-P AL-B/G

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-4870 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-4870 will turn its 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.

Note

DOCSIS = Data over cable service interface specification
CMTS = Cable modem termination system

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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 INFORMATION

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. You 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-4870 output frequency for a selected channel number. Tables at the
end of this manual list these values.

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 RATE, and ADDRESS:

These functions are not used with the OTM-4870.

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