Olson Technology LCM-550x1 User Manual

LCM-550x12

SERIES

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Section I: Modulators

1. LCM-550x1

2. LCM-550x1 PAL I

3. LCM-550x1 P AL BG

Section II: Demodulators

1. LCD-550x1

4. LCD-550x1 P AL D/K

Section III: Amplifiers

1. LCX12-AMP

Section IV : Combiners

LCM-550x12 Series

1. LCM-550-FAC

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LCM-550x12

12 CHANNEL TELEVISION MODULATOR SYSTEM

INSTRUCTION MANUAL

Phone:

E-Mail: [email protected]

025-000329 REV C 6/1/01

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Fax:

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LCM-550x12

Frequency Agile Modulator System

Specifications

Output Frequency Range: 55.25 to 547.25MHz in 2MHz increments, selected by front panel

DIP switch. 250KHz increments internally selectable for HRC
frequencies.

Output Power: +40dBmV minimum, +45dBmV typical per channel. Downward

adjustable by 10dB minimum.

Spurious Outputs: >60dB below output video carrier out of band.

Out-of-Band C/N: >80dB below output video carrier (4MHz bandwidth) - per channel.

In-Band C/N: >57dB

Frequency Stability/Accuracy: Designed to meet F.C.C. title 47 part 76 (+10 Celsius to + 40 Cel-

sius). Offset adjustable by front panel potentiometer .

Audio/Video Ratio Adjust: From 13dB to 20dB below video carrier. Adjustable by front panel

potentiometer.

Audio Intercarrier Accuracy: 4.5MHz +/- 1KHz

Video Input: 1V P-P nominal for 85% modulation. Front panel adjustable, from as

low as 0.5V P-P input. 75 Ohm input Z utilizing an RCA connector.

Audio Input: 500mV P-P for 25KHz deviation. Adjustable by front panel potenti-

ometer. 10K input Z utilizing an RCA connector.

Power Requirements: 85 - 264VAC, 47 - 63Hz, 60 Watts maximum.

Size: 3.5”H x 19”W x 11”D (Rack Mount Chassis)

Weight: 10 LBS.

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12 CHANNEL, FREQUENCY AGILE - F.C.C. COMPATIBLE

1.) INTRODUCTION

The Olson T echnology LCM-550X12 can consist of twelve frequency agile F .C.C. compatible television
modulators in a single 3 ½” rack – mount chassis. The LCM-550X12 has a separate RF output for
each channel, and each channel may be operated at +45dBmV typical, +40dBmV guaranteed mini­mum. The LCM-550X12 modulator is compatible with baseband scrambling techniques. No I.F .
loops are provided on these modulators.

Each of the twelve modulators will operate on any standard or cable channel from 55.25MHz to

547.25MHz (VHF channels 2 through 13 and cable channels 14 through 78). All channels are select­able by front panel DIP switches and a front panel adjustment allows setting to F .C.C. of fset
frequencies. HRC frequencies are available.

LCM-550x12

TELEVISION MODULA TOR SYSTEM

Each of the modulators in the LCM-550X12 offers the unique Olson Technology feature of >80dB
out-of-band carrier to noise ratio. These units use SAW filtering for adjacent channel operation, and
provide 60dB of spurious free dynamic range. These features allow virtually unlimited numbers of
LCM-550X12’s to be combined without the need for external bandpass filters.

The LCM-550X12 has low power consumption (approximately 5 watts per channel @ 115 VAC) for
economical and reliable long term operation.

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2.) CHANNEL SELECTION

Channel frequencies are selected by setting the 10-position DIP switch (visible through the vertical
slot in the front panel). The front panel is illustrated in figure 1.

Channel Select

Figure 1 – LCM-550 Front Panel

Switch-setting codes for standard channels are shown in Figure 2 and on the code card provided with the
system. Switch-setting codes for HRC channel frequencies can be found in T able 2 and Figure 3 in this
manual. The front panel illustration in Figure 1 shows a switch properly set for standard channel 2.

3.) F.C.C. OFFSET ADJUSTMENT

F.C.C. Offset frequencies are shown in Table 1 and summarized on the code card provided with the
system. To adjust the frequency of a selected channel to provide the correct F.C.C. offset, look up its
offset frequency in Table 1 (or use the summary on the code card). Remove the video input and
connect a counter to the RF output of the LCM-550. Use the front panel offset adjust control to set
the output frequency to the correct value.

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Figure 2 - CHANNEL SWITCH SETTING CODES

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TABLE 1 F.C.C. OFFSET FREQUENCIES

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TABLE 2 HRC CHANNEL CODES

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TABLE 2 CONTINUED. HRC CHANNEL CODES

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Figure - 3 INTERNAL SW2 SETTINGS FOR HRC / STD

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4.) REAR PANEL

The rear panel of each module has its audio and video inputs and its RF output. The audio and video inputs are RCA
type phono jacks and the RF output is a type “F”.

5.) VIDEO MODULATION ADJUSTMENT (Each modulator).

LCM-550X12 modulator modules are preset at the factory for 85% depth of modulation with a 1V P-P pulse and bar
test signal. If the video modulation needs to be adjusted, follow the procedure below.

Connect the video source (to be used at approximately 1V P-P) to the video input phono jack. The video should be of a
reasonably bright scene (commercials are usually excellent).

Adjust the video modulation control on the front panel to obtain approximately 85% depth-of modulation as measured
on a spectrum analyzer or other test equipment capable of this measurement.

If the video modulation control needs to be set and there is no test equipment available, it can be set fairly close by
comparison. View a video signal on a properly adjusted television receiver or receiver/monitor. Apply the same signal
if possible, or one of equivalent brightness and contrast to the modulator that needs to be set. View the output of this
modulator on the same receiver and adjust the video modulation control for brightness and contrast equivalent to the
directly viewed picture. Use caution and do not set this control too high.

6.) AUDIO MODULATION ADJUSTMENT (Each modulator).

Connect the audio source (to be used at approximately 500mV P-P) to the audio input phono jack.

Monitor the audio on a television receiver and adjust the audio modulation control for proper loudness as compared
with some channel known to be modulating at the correct level (such as a broadcast station).

The two sources of audio should be very similar in their content and should be near maximum loudness as compared to
the average level of their program. In other words, compare a loud passage with a loud passage and set the audio
modulation control with this program material. Use caution and do not set this control too high.

7.) OPERATION WITH COMPOSITE BASEBAND BTSC AUDIO INPUT (Each modulator).

The LCM-550X12 modulators are compatible with a composite baseband BTSC audio input. An internal jumper must
be changed to remove audio pre-emphasis as required for this application.

To remove audio pre-emphasis, disconnect and remove the LCM-550 module from the main shelf and remove its left
side cover. Cut board where indicated.

Replace the module cover, replace the module in the main shelf, and set-up the audio deviation per the instructions for
the BTSC generator being used.

8.) RF OUTPUT AND AURAL CARRIER LEVEL ADJUSTMENT (Each modulator).

A) Using a field strength meter or spectrum analyzer, set the video carrier to the desired level with the output level

(RF) control (typically +40 to +45dBmV).

B) Tune the field strength meter to the aural carrier, which is located 4.5 MHz above the video carrier.

C) Adjust the aural carrier level control (A\V) to the desired level, typically 15dB below the video carrier.

CAUTION: Reducing the aural \ visual carrier ratio to less than 15dB can result in high out-of-band spurious
signals on adjacent channels.

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9.) MISCELLANEOUS

A) The front panel adjustments (RF, OFFSET, etc.) are small, and somewhat delicate. Use CAUTION and an

adjustment tool that is a proper fit when adjusting these controls.

B) The LCM-550X12 is BTSC stereo compatible. Each modulator is shipped in the “mono” mode. To defeat the

pre-emphasis in order to use a composite baseband BTSC input signal, see section 7 of this manual.

C) The LCM-550X12 power supply is equipped with an internal 3Amp. 250V GMA fuse. For continued safety, and

to maintain proper performance of the unit, please replace only with an equivalent fuse.

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LCM-550X12

PAL I ADDENDUM

INSTRUCTION MANUAL

Phone:

E-Mail: [email protected]

025-370312 REV B 8/2/01

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LCM-550X12

PAL I

Specifications

Output Frequency Range ........................... 48.25MHz to 551.25MHz. Selectable by front panel DIP switch in

2MHz increments (250KHz internal adjustment)

Frequency Offset ........................................ +12.5KHz tunable by front panel adjustment

Output Power Level ................................... +40dBmV minimum per channel, +45dBmV typical

Frequency Accuracy / Stability .................. <±5KHz of selected channel frequency (+10°C to +40°C)

Video Performance ..................................... 1V P-P input nominal for 80% modulation. Differential gain <5%

Differential Phase <5°

Spurious Outputs ........................................ >55dB below output visual carrier level, 60dB typical

Out-of-Band C/N ........................................ >76dB as measured in a 4.0MHz noise bandwidth

In-Band C/N ............................................... >60dB as measured in a 4.0MHz noise bandwidth

Audio / Video Ratio .................................... Adjustable from 13dB to20dB below video carrier

Audio Performance ..................................... 500mV P-P for 50KHz deviation, front panel adjustable.10K input Z

Audio Intercarrier Stability ........................ 6.0MHz within ±1KHz

Front Panel Controls .................................. RF output adjust

A/V ratio adjust
Video & Audio modulation
Frequency offset adjust
Channel select DIP switches

Power Requirements .................................. 85-264VAC, 47-63Hz, 72 watts

Chassis Size ............................................... 3.5”H x 19”W x 11”D (Rack mount chassis)

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CHANNEL SELECTION

Channels are selected with 10 front panel DIP Switches and 3 internal DIP switches.

0=Switch in RIGHT Position
1=Switch in LEFT Position

Settings shown above are for channel 1, 55.25MHz.

REAR PANEL

The rear panel of each module has Audio and Video inputs, RF output and Power In. The Audio and Video

inputs are RCA type phono jacks and the RF output is type “F”.

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Page 16

LCM-550-I Dip Switch Settings

025-370312 REV B

Page 17

LCM-550X12

PAL B/G ADDENDUM

INSTRUCTION MANUAL

Phone:

E-Mail: [email protected]

025-370311 REV B 8/2/01

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LCM-550X12

PAL B/G

SPECIFICAIONS

Output Frequency Range ........................... 48.25MHz to 551.25MHz. Selectable by front panel DIP switch in

2MHz increments (250KHz internal adjustment)

Frequency Offset ........................................ +12.5KHz tunable by front panel adjustment

Output Power Level ................................... +40dBmV minimum per channel, +45dBmV typical

Frequency Accuracy / Stability .................. <±5KHz of selected channel frequency (+10°C to +40°C)

Video Performance ..................................... 1V P-P input nominal for 80% modulation. Differential gain <5%

Differential Phase <5°

Spurious Outputs ........................................ >55dB below output visual carrier level, 60dB typical

Out-of-Band C/N ........................................ >76dB as measured in a 4.0MHz noise bandwidth

In-Band C/N ............................................... >60dB as measured in a 4.0MHz noise bandwidth

Audio / Video Ratio .................................... Adjustable from 13dB to20dB below video carrier

Audio Performance ..................................... 500mV P-P for 50KHz deviation, front panel adjustable.10K input Z

Audio Intercarrier Stability ........................ 5.5MHz within ±1KHz

Front Panel Controls .................................. RF output adjust

A/V ratio adjust
Video & Audio modulation
Frequency offset adjust
Channel select DIP switches

Power Requirements .................................. 85-264VAC, 47-63Hz, 72 watts

Chassis Size ................................................. 3.5”H x 19”W x 11”D (Rack mount chassis)

025-370311 REV B

Page 19

CHANNEL SELECTION

Channels are selected with 10 front panel DIP Switches and 3 internal DIP switches.

0=Switch in RIGHT Position
1=Switch in LEFT Position

Settings shown above are for channel 2, 48.25MHz.

REAR PANEL

The rear panel of each module has Audio and Video inputs, RF output and Power In. The Audio and Video

inputs are RCA type phono jacks and the RF output is type “F”.

025-370311 REV B

Page 3

LCM-550 B/G Dip Switch Settings

025-370311 REV B

Page 4

LCD-550

LOW COST AGILE

TELEVISION DEMODULATOR

INSTRUCTION MANUAL

Phone:

E-Mail: [email protected]

025-000345 REV B 8/21/01

[phone]
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Fax:

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CAUTION!

USE CARE WHEN CHANGING CHANNELS OR MAKING ADJUSTMENTS TO THE

LCD-550 MODULES

These units are very small and they use smaller (and more delicate) components than are normally found in larger
equipment.

The DIP switch levers can be damaged by excessive force. Use a small pointed object to gently move the switch
levers to the required positions.

The rotating controls can be pushed-in and broken if too much force is applied against them. When adjusting these
controls, use caution and an alignment tool in good condition that is a good fit to the control slot.

025-000345 REV B Page 2

FRONT PANEL CONTROLS

Front panel controls should be adjusted only with plastic alignment tools. Damage may result if metal tools

are used. Refer to the following figure for the location of the front panel controls.

Figure 1

The LOW RF LED turns on with low or missing RF input. It also flashes on invalid tuning or mode settings. All outputs
are squelched with low RF or invalid tuning.

The VIDEO ON dipswitch turns all outputs on and off.

The CA TV-BCST dipswitch changes the tuning mode. In the CA TV position the tuning mode is set by the tuning mode
switch on the top of the demod. The BCST mode tunes NTSC broadcast VHF/UHF channels. This mode is invalid
for all P AL units.

The channel select switches tune the RF input frequency . The set point of these switches is indicated by a small
triangular notch that is perpendicular to the adjustment slot. When tuning by frequency , these switches are the
frequency in MHz, with the .25MHz steps set by the tuning mode switch.

025-000345 REV B

Page 4

OPERATION

Most adjustments require removing the top cover. T o access the bottom unit in a dual version, remove the 2

screws holding the top demod to the front panel. T o access the internal adjustments, it is not necessary to remove the
demod from the front panel; just remove the top cover screws. Figure 2 shows the adjustment locations. When all
adjustments are complete, replace the top cover. For dual units, repeat this process for the top unit.

MODE SWITCH

This switch selects the CA TV tuning mode. It is accessed through a hole in the top cover . Note that P AL

units tune by frequency only . Positions 0-2 select traditional channel plans. Positions 3-5 select EIA standard
channel plans. Positions 6-9 select direct frequency tuning.

025-000345 REV B

Page 5

TROUBLESHOOTING

No output, low RF LED on:

RF input low or absent.
Incorrect tuning mode or channel.

Check the small triangular notch for switch settings.

No output, low RF LED flashes:

Invalid tuning. Check tuning and mode switches. P AL units tune by frequency only . Broadcast
channel mode is also invalid for P AL.

V ideo output very high contrast and distorted:

V ideo output is unterminated.

V ideo output washed out:

V ideo output is double terminated.

Audio problems:

V erify correct jumper settings. Pre-emphasis setting on modulator must
match that of demodulator .

025-000345 REV B

Page 7

LCD-550-X1

SPECIFICATIONS

RF Input................................................

RF Input Level.......................................

V ideo Output.........................................

V ideo Performance.................................

Audio Output T ypes...............................

Audio Output.........................................

MPX Audio Output (NTSC)..................

Audio Subcarrier Output........................

NTSC 54 to 801.25MHz

Off-air -10dBmV to +25dBmV
CA TV -10dBmV to +10dBmV

1V p-p +/- 5 IRE into 75Ω

Diff. gain < 5%
Diff. phase < 3°

Normal Audio
Multiplex Audio
Subcarrier
(selected by internal jumpers)

500 mV p-p into 600Ω unbalanced
500 mV p-p into 600Ω unbalanced
> +40dBmV into 75Ω unbalanced

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

Front Panel Indicator..............................

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

Power Requirements..............................

Size.......................................................

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

Output on/off
CATV/Broadcast
Rotary tuning switches

Low RF

RF in, V ideo out...type “F”
Audio...RCA

< 2 watts from LCM-550 RKA chassis
(5V @ 165mA and 10V @ 30mA typical)

1.3x3x6

< 1 lb.

025-000345 REV B

Page 8

CHANNEL PLANS

Frequencies shown are rounded to 2 decimal places. 121.26 indicates a 12.5KHz off-set or 121.2625 assignment.

331.27 is actually 331.2750. The HRC frequencies are based on a harmonic of 6.0003MHz. The LCD-550 has
AFC that will tune to these offsets without any special adjustment.

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Page 10

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Page 11

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Page 12

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INTRODUCTION

The LCD-550 is a small low cost demodulator for use in cable and off-air applications. It is designed to mount
in Olson T echnology’s LCM-550-RKA rack mountable chassis. The demodulator is shipped as a single LCD-550
and occupies 3 slots in the LCM-550 RKA chassis.

The LCD-550 can be made into a dual demodulator assembly by removing the front panel and guide pin on the
second LCD-550 and installing on top of the first demodulator .

The units have a front panel switch that switches between NTSC broadcast channels and a user defined CA TV
tuning mode. The user can select from 6 NTSC channel plans and frequency tuning.

The units have a single RCA type audio output connector . The type of signal at this connector is selected from
3 types by internal jumpers. The user can choose normal audio, multiplex audio, or subcarrier. RF Input and V ideo

Output connectors are “F” type. See Figure 2 for connector location.

The demods have an LED that indicates low input levels. This LED also flashes with invalid tuning settings.
(LED is labeled “NO VIDEO” on some early models)

INST ALLATION

Units are shipped in the Olson T ech CATV tuning mode with normal audio output. If other settings are
required, go to page 4 for instructions.

Slide the unit into the rack shelf, making sure that the notch on the rear of the unit engages the tab on the shelf.
Install and tighten the front thumb screw .

Connect the Audio and V ideo Output cables and the RF Input cable. Note that the combiner on the rear of
some LCM-550 rack shelves is for outputs, not inputs. It is recommended that units be added with the rack assembly
powered down, but they can be added hot as long as the long ground pin makes contact first. Connect the power
cable(s).

Set the tuning switches to the desired channel. If the unit is driving an LCM-550 with normal audio, no
internal adjustments will be required. See Figure 1 for front panel controls.

025-000345 REV B

Page 3

INTERNAL CONTROLS

Refer to the following figure for the location of the internal controls

Figure 2

The VID pot sets the video output level. The video level should be measured into a 75ohm load.

The SUB pot sets the subcarrier output level. It does not affect the audio level.

The AUD pot sets the audio output level in both the normal and multiplex modes. It may need adjustment when
changing between normal and multiplex outputs.

The SQL pot sets the low RF level where the outputs are squelched.

There are two jumpers that select the type of audio output. The AUD-SUB jumper selects between subcarrier
and baseband audio outputs. If this jumper is in the AUD position, then the MPX-NOR jumper selects the type of
baseband audio output.

The NOR position is normal audio output. In the MPX position, the audio de-emphasis is disabled. This is
used for multiplex BTSC stereo. In the multiplex mode, the audio pre-emphasis on the associated modulator should
also be disabled

025-000345 REV B

Page 6

LCD-550 PAL D/K

LOW COST AGILE

TELEVISION DEMODULATOR

INSTRUCTION MANUAL

Phone:

E-Mail: [email protected]

025-000350 REV B 8/06/01

[phone]
[phone]

Fax:

[phone]

www.olsontech.com

025-000350 REV B

Page 10

CAUTION!

USE CARE WHEN CHANGING CHANNELS OR MAKING ADJUSTMENTS TO THE

LCD-550 MODULES

These units are very small and they use smaller (and more delicate) components than are normally found in larger
equipment.

The DIP switch levers can be damaged by excessive force. Use a small pointed object to gently move the switch levers
to the required positions.

The rotating controls can be pushed-in and broken if too much force is applied against them. When adjusting these
controls, use caution and an alignment tool in good condition that is a good fit to the control slot.

025-000350 REV B

Page 2

INTRODUCTION

The LCD-550 is a small low cost demodulator for use in cable and off-air applications. It is designed to mount
in Olson T echnology’s LCM-550-RKA rack mountable chassis. The demodulator is shipped in both single (LCD­550X1) and dual (LCD-550X2) versions. Both versions occupy 3 slots in the LCM-550 RKA chassis.

The units have a single RCA type audio output connector . The type of signal at this connector is selected from
3 types by internal jumpers. The user can choose normal audio, multiplex audio, or subcarrier. RF Input and V ideo
Output connectors are “F” type. See Figure 2 for connector location.

The demods have an LED that indicates low input levels. This LED also flashes with invalid tuning settings.
(LED is labeled “NO VIDEO” on some early models)

INST ALLATION

Units are shipped in the + .25MHz frequency tuning mode with normal audio output. P AL versions tune by
frequency only with three front panel rotary switches. If other settings are required, go to page 4 for instructions.

Slide the unit into the rack shelf, making sure that the notch on the rear of the unit engages the tab on the shelf.
Install and tighten the front thumb screw .

Connect the Audio and V ideo Output cables and the RF Input cable. Note that the combiner on the rear of
some LCM-550 rack shelves is for outputs, not inputs. It is recommended that units be added with the rack assembly
powered down, but they can be added hot as long as the long ground pin makes contact first. Connect the power
cable(s).

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Page 3

FRONT PANEL CONTROLS

Front panel controls should be adjusted only with plastic alignment tools. Damage may result if metal tools
are used. Refer to the following figure for location of the front panel controls.

FIGURE 1

The LOW RF LED turns on with low or missing RF input. It also flashes on invalid tuning or mode settings. All
outputs are squelched with low RF or invalid tuning.

The VIDEO ON dipswitch turns all outputs on and off.

The CA TV-BCST dipswitch changes the tuning mode. In the CATV position the tuning mode is set by the
tuning mode switch on the top of the demod. The BCST mode tunes NTSC broadcast VHF/UHF channels.
This mode is invalid for all P AL units.

The channel select switches tune the RF input frequency . The set point of these switches is indicated by a
small triangular notch that is perpendicular to the adjustment slot. When tuning by frequency , these switches
are the frequency in MHz, with the .25MHz steps set by the tuning mode switch.

025-000350 REV B

Page 4

OPERATION

Most adjustments require removing the top cover. T o access the bottom unit in a dual (X2) version, remove
the 2 screws holding the top demod to the front panel. T o access the internal adjustments, it is not necessary to remove

the demod from the front panel; just remove the top cover screws. Figure 2 shows the adjustment locations. When all
adjustments are complete, replace the top cover. For X2 units, repeat this process for the top unit.

MODE SWITCH

This switch selects the CA TV tuning mode. It is accessed through a hole in the top cover . Only positions
6-9 are valid settings on P AL units. Positions 0-2 select traditional channel plans. Positions 3-5 select EIA stan-

dard channel plans. Positions 6-9 select direct frequency tuning.

025-000350 REV B

Page 5

INTERNAL CONTROLS

Refer to the following figure for the location of the internal controls.

FIGURE 2

The VID pot sets the video output level. The video level should be measured into a 75ohm load.

The SUB pot sets the subcarrier output level. It does not affect the audio level.

The AUD pot sets the audio output level in both the normal and multiplex modes. It may need adjustment when
changing between normal and multiplex outputs.

The SQL pot sets the low RF level where the outputs are squelched.

There are two jumpers that select the type of audio output. The AUD-SUB jumper selects between subcarrier and
baseband audio outputs. If this jumper is in the AUD position, then the MPX-NOR jumper selects the type of
baseband audio output.

The NOR position is normal audio output. In the MPX position, the audio de-emphasis is disabled. This is used
for multiplex BTSC stereo. In the multiplex mode, the audio pre-emphasis on the associated modulator should also
be disabled

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Page 6

TROUBLESHOOTING

No output, low RF LED on:

RF input low or absent.
Incorrect tuning mode or channel.

Check the small triangular notch for switch settings.

No output, low RF LED flashes:

Invalid tuning. Check tuning and mode switches. P AL units tune by frequency only . Broadcast channel
mode is also invalid for P AL.

Video output very high contrast and distorted:

V ideo output is unterminated.

Video output washed out:

V ideo output is double terminated.

Audio problems:

V erify correct jumper settings. Pre-emphasis setting on modulator must
match that of demodulator .

025-000350 REV B

Page 7

LCD-550 P AL D/K SPECIFICA TIONS

RF Input .......................................

RF Input Level ..............................

V ideo Output ................................

V ideo Performance .......................

Audio Output T ypes ......................

Audio Output ................................

MPX Audio Output .......................

Audio Subcarrier Output ...............

P AL D/K 49.75 to 863.25MHz

Off-air -10dBmV to +25dBmV
CA TV -10dBmV to +10dBmV

1V p-p +/- 5 IRE into 75 Ω

Diff. gain < 5%
Diff. phase < 3°

Normal Audio
Multiplex Audio
Subcarrier
(selected by internal jumpers)

500 mV p-p into 600 Ω unbalanced
500 mV p-p into 600 Ω unbalanced
> +40dBmV into 75 Ω unbalanced

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

Front Panel Indicator .....................

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

Power Requirements .....................

Size ..............................................

W eight ..........................................

Output on/off
CA TV/Broadcast (only CATV is valid on P AL units)
Rotary tuning switches

Low RF

RF in, V ideo out...type “F”
Audio...RCA

< 2 watts from LCM-550 RKA chassis
(5V @ 165mA and 10V @ 30mA typical)

1.3x3x6

< 1 lb.

025-000350 REV B

Page 8

P AL D/K Channels

025-000350 REV B

Page 9

LCM-550x12 AMPLIFIER

55 TO 870MHz DISTRIBUTION AMPLIFIER

INSTRUCTION MANUAL

Phone:

E-Mail: [email protected]

025-000354 REV . A 6/25/01

[phone]
[phone]

Fax:

[phone]

www.olsontech.com

LCM-550x12

55 to 870MHz DISTRIBUTION AMPLIFIER

1) INTRODUCTION

The Olson T echnology 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) INST ALLA TION

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 T est 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.

025-000354 REV . A Page 2

3) OPERA TION

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 yo ur desired carrier levels are below +41 dBmV , Olson T echnology 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) SPECIFICA TIONS

4)4)

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

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

Gain V ariation..........................+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

025-000354 REV . A Page 3

LCM-550-FAC

TWEL VE-PORT COMBINER

FOR LCM-550X12 SERIES

INSTRUCTION MANUAL

Phone:

E-Mail: [email protected]

025-000354 REV . A 6/22/01

[phone]
[phone]

Fax:

[phone]

www.olsontech.com

1) INTRODUCTION

The OLSON TECHNOLOGY LCM-550-F AC is a 12-port combiner with a frequency range of

50-550MHz. Although this combiner is capable of operation to 870MHz, it is not specified

beyond 550 MHz.

This field-installable combiner is designed to integrate with the LCM-550X12 Series system and mounts in

place of the blank front panel at the top of the unit. RF interconnect cables are provided to enable

connection to 12 modulator modules.

T welve inputs and the common RF output are at the rear of the unit. For convenience, the (nominal) –20dB

test point is accessible from the front of the unit.

T wo other 12-port combiners are available from OLSON TECHNOLOGY : These units mount in standard

19" equipment racks and are 1 rack-unit high. The OTHC-12 has a frequency range of 5MHz to 550MHz

and the OTHC-12-1G has a frequency range of 50MHz to 1000MHz.

LCM-550-FAC

TWEL VE PORT COMBINER

FOR LCM-550X12 SERIES

2) INST ALLA TION

If the LCM-550X12 Series system is mounted in an equipment rack, it must be removed or moved forward

enough to provide access to the four screws on each side that secure the top front panel.

Remove the screws that secure the top front panel and remove the panel.

Using the screws removed above, mount the combiner in place of the blank front panel. If necessary ,

reinstall the system in the equipment rack.

Connect the RF cables to the modulators as required. Use caution not to damage or bend the small center

conductors of these cables. The combined signals are available at the RF output connector.

3) OPERA TION

Connect a spectrum analyzer or signal level meter to the RF output and adjust the individual modulators as

required for the desired combined levels.

NOTE: This combiner has an insertion loss of between 17dB and 23dB. The LCM-550 modulators should

not be operated above +45dBmV . T ake these values into account when setting the output levels from the

combiner. If higher output levels are required, the OLSON TECHNOLOGY LCM-550X12 amplifier is

available. This amplifier mounts-to and is powered-by the LCM-550 Series system main chassis. It will

operate at +45 dBmV out with 12 channels.

Once the levels have been set, the levels at the test point may be measured and recorded for future

reference. Note that the RF output must be terminated in 75Ω when making these test point measurements.

025-000354 REV . A Page 2

4) SPECIFICA TIONS

FREQUENCY.................................................50MHz to 550MHz

INSER TION LOSS.........................................20 +3.0dB

TEST POINT LOSS........................................20

+3.0dB

POR T-TO-POR T ISOLA TION.......................35dB Minimum

RETRUN LOSS..............................................13dB Minimum

CONNECTOR................................................T ype “F” - (ALL)

025-000354 REV . A Page 3