Olson Technology LCM-600 User Manual

LCM-600

TRIPLE TELEVISION MODULATOR

INSTRUCTION MANUAL

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025-000082 REV C 8/03/01

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1) INTRODUCTION

The Olson T echnology LCM-600 consists of three frequency agile F .C.C. compatible television modulators in
a single 1-3/4" rack- mount chassis. The three modulator outputs are internally combined and amplified. The
LCM-600 has a single RF output and each channel may be operated at +53 dBmV typical, +50 dBmV
guaranteed minimum. A high level (+36dBmV) combined visual/aural i.f. loop is provided for each of the three
modulators.

Each of the three modulators will operate on any standard or cable channel from 54MHz to 450MHz (VHF
channels 2 through 13 and cable channels A through YY). All channels are selectable by front panel DIP
switches and a front panel adjustment allows setting to F .C.C. offset frequencies.

The RF output from each of the three modulators may be turned off to facilitate trouble shooting or to allow
channel change without inadvertently interfering with other operating channels.

LCM-600

TRIPLE, FREQUENCY AGILE - F .C.C. COMP ATIBLE

TELEVISION MODULA TOR

The LCM-600 offers the unique Olson T echnology feature of >72dB out-of-band carrier to noise ratio (from
the common output with all three channels operating). This unit uses SA W filtering for adjacent channel opera­tion, and it provides 60dB of spurious free dynamic range. These features allow virtually unlimited numbers of
LCM-600’ s to be combined without the need for external bandpass filters.

The LCM-600 has low power consumption (7.5 watts per channel @ 115 V AC) for economical and reliable
long term operation.

2) RF OUTPUT SHUTDOWN

If the output level control (marked “RF” on the front panel) for a modulator is rotated fully CCW , the output
of that modulator will be switched completely off. This feature may be used to facilitate trouble shooting or
to shut down an individual channel for any other desired reason.

It is suggested that this feature be used when changing channels on a unit whose output is connected to an
operating system. This will prevent the possibility of interfering with other channels as the channel select
switches are moved to their new settings.

After turning the RF control back up to switch the channel back on, the output level for that channel must be
reset to the proper value for your application.

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