Olson Technology LCM-750x3 User Manual

LCM-750x3

AGILE VIDEO MODULATOR

INSTRUCTION MANUAL

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025-000392 REV D 8/20/01

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LCM-750X3

AGILE MODULA TOR

SPECIFICATIONS

EACH MODULE

Output Frequency Range: 48.25 to 749.25MHz in .25 MHz mode

Output Power (Video): +55 dBmV minimum, Adjustable down 10dB

Output Impedance: 75 Ohms

Output Return Loss 15 dB Minimum

Phase Noise > -78dBc/Hz @ 10 KHz

IF Loop Level (Video) +38 dBmV @ 45.75 MHz

IF Loop Level (Audio) +18 to +26dBmV @ 41.25 MHz

Spurious Outputs >55 dB minimum below video carrier, 60 dB typical

Out-of-Band C/N >75 dB below output video carrier, 4 MHz BW

In-Band C/N >63 dB below output video carrier, 4 MHz BW

Frequency Accuracy <+/- 5 KHz

Audio Video Ratio Adjustment From 20 dB to 12 dB below video carrier

Audio Intercarrier Accuracy 4.5 MHz +/- 400 Hz

Video Input 1 V-p-p nominal for 85% modulation

75 Ohm input impedance, F Connector

Audio Input 500mV to 1.4V p-p at 600 Ohm balanced

Power Requirements (one module) +5V @ 780mA, +10V @ 150mA & 24V @ 1mA

COMPLETE UNIT

Power Requirements 90 – 264 VAC, 47 – 63 Hz, 25 W atts

power entry connector

Operating Temperature 0 – 50 degrees C

Chassis Size 1.75” H x 19” W x 9.5” D

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1) INTRODUCTION

The Olson T echnology LCM-750 X3 is a rack mounted chassis 1.75” high that contains 3 LCM-750
frequency agile FCC compatible video modulators. Each modulator provides +55 dBmV output from

48.25 MHz to 750.00 MHz. Channel mode or frequency mode of operation is selectable via a selector
switch accessible from the top plate. Channel modes include CA TV, HRC, IRC and Broadcast. FCC
offsets of +12.5 KHz and +25 KHz are automatically provided depending on the channel plan selected.

The LCM-750 offers the unique Olson T echnology feature of >75 dB out-of-band carrier to noise ratio
along with SA W filtering to provide professional level performance.

Standard composite video and audio or I.F . can be input to the unit.

2) CHANNEL SELECTION

The mode selector switch, SW4 located through the top cover of the LCM-750 allows selection of the
following modes of operation. The selector switch has 10 positions available. The mode switch is set to
position 3, EIA CATV STD, when unit is shipped.

0. CA TV STD (GI ) NTSC

1. HRC ( GI ) NTSC

2. IRC ( GI ) NTSC

3. EIA CA TV STD NTSC

4. EIA HRC NTSC

5. EIA IRC NTSC

6. BROADCAST NTSC

7. MHz +0 MHz

8. MHz +0.25 MHz

9. UNDEFINED

The front panel switches labeled 100’ s, 10’s and 1’ s will adjust the frequency as indicated in modes 7 and

8. In modes 0-6 the front panel switches adjust to indicate the channel selected. For instance, a 0 selected
for the 100’s and 10’ s, with a 5 selected for the 1’ s switch would select channel 5.

When a valid channel is selected, the green LED, located on the front panel will light indicating synthe
sizer lock. The RED LED will flash when an invalid channel is selected and solid when no lock has
occurred. A channel plan is provided at the end of this owners manual.

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