Olson Technology LCx12-AMP User Manual

LCM-550x12 AMPLIFIER

55 TO 870MHz DISTRIBUTION AMPLIFIER

INSTRUCTION MANUAL

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025-000354 REV. A 6/25/01

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LCM-550x12

55 to 870MHz DISTRIBUTION AMPLIFIER

1) INTRODUCTION

The Olson Technology Inc. LCM-550x12 Series Amp is a high performance 55 to 870MHz distribution amplifier
designed to work with the output of the 12-port combiner. It is easily attached to the back of the LCM-550x12
chassis by two thumb screws. It will provide +45dBmV of output per channel when connected to the output of the
12 port combiner.

This amplifier is powered from the LCM-550x12 power supply and it includes the required D.C. power intercon­nect harness. Also included with this amplifier is a cable to connect the 12 port combiner output to the amplifier
input.

2) INSTALLATION

A) Attach the amplifier to the vertical lip at the rear of the LCM-550x12 chassis. The lip of the chassis

fits into the slot at the bottom of the amplifier. The RF Output and Test Point connection should face
to the rear. Loosen the two thumbscrews to allow the amplifier to sit all the way down on the shelf
lip. Center the aplifier left to right and tighten the thumbscrews firmly to hold it in place.

B) Locate the D.C. power harness on the LCM-550x12 intended for the eighth module position

(counting from the left side). If the harness is connected to a module, unplug it.

Plug this harness into the 4-pin power connector on the amplifier. Note that the connector is keyed
to aid in plugging it in properly, but it CAN be forced on upside down. When correct, the RFD wire
is in the TOP position. Do not plug it in upside down.

The D.C. power harness permanently attached to the amplifier is intended to provide power to the
eighth module position. If there is a module in the eighth position that was disconnectd earlier,
connect this harness to it. Use the same caution as above to insure that the connector is not plugged
in upside down. Note that on the modulator module, the redwire is on the BOTTOM.

C) Connect the provided RF cable between the combiner RF out and the amplifier RF input. Use

caution not to damage or bend the small center conductor of this cable.

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3) OPERATION

The LCM-550x12 amplifier is the designed to operate at +45 dBmV out with 12 channels. Measure the
direct output of the amplifier with a spectrum analyzer or signal level meter. Adjust the output level controls
on the individual modulators for your desired operational levels. Exceeding the specified +45 dBmV
maximum output level (12 channels) may cause systems distortion levels to exceed acceptable levels. If all
of your desired carrier levels are below +41 dBmV, Olson Technology suggests that you use a fixed
attenuator pad between the combiner output and the amplifier input. Use a 3dB pad for maximum outputs
of 35-41 dBmV, a 6dB pad for 35-38, etc. Once the output levels are set, the amplifier may be connected
to its intended use and levels at its test point maybe measured and recorded for referance. If the amplifier

test point is used as a output, be sure that the main output is terminated in 75Ω.

4)4)

4) SPECIFICATIONS

4)4)

Frequency................................48MHz to 870MHz

Gain........................................ 22dB minimum

Gain Variation.......................... +1dB minimum

Input Return Loss.....................15dB minimum

Output Return Loss..................16dB minimum

CTB/CSO with 12 Carriers..... >65dB below 12 output carriers at +45dBmV

Power Requirments..................Operates from LCM-550x12 power supply. <4 watts

LCM-550x12

55 to 870MHz DISTRIBUTION AMPLIFIER

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