Linear H881 Owner's Manual

ChannelPlus Modulator Combiner Hub

The H881 modulator combiner hubhas inputs for 8 modulators

for distribution through a coax panel. Signals from

all 8 inputs are combined into a single

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odulators

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output. This output can be

connected to the modulator

input of a coax panel such
as the H838HHR or
H838BID. When used

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with the H838, each of 8

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locations has a broadband
feed as well as the ability
to insert channels into the
system.

Typical Installation

Model H838HHR shown

Antenna or cable
(H838HHR)
Cable only
(H838BID)

DVD, VCR, or Satellite

+12vdc

+Pwr

Connect modulators
to A or B inputs

IR

Gnd

B

Modulators

A

High Headroom Amp w/IR Engine

Televisions

RG-6 Coaxial cable

CATV

/Ant

Up to 8 TV locations

Each of 8 locations can have

its own modulator for

distribution to the entire

system

Modulator

350-086 power
supply (included)

RG-6 Coaxial cable

Input from up
to 8 locations

Adaptor

(included)

Modulator Combiner Hub 8x1

Gnd

+15vdc

400MHz to 860MHz

Model

H881

LED glows when
power is applied

Out

Modulators

OpenHouse modules attach from the top

tm

1

1) Hook from the top

2) Swing into place

3) Push button to lock

3

4

3

2

1

2

From

From

Telco

Telco

RTR

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R

R

T

T

R

R

T

T

R

R

T

T

Expansion

Expansion

Ports

Ports

RJ31XRJ31X

Out

TelephoneMaster Hub (4 lines x 6 phones)

TelephoneMaster Hub (4 lines x 6 phones)

ChannelPlusmodel H616

Telephones

Things To Watch For:

No picture

… Check that the TV and the modulator are tuned to the
same channel. For example, if the modulator is broadcasting on UHF
channel 16, make sure the TV is on UHF 16 rather than CATV 16.
UHF 16 and CATV 16 are at different frequencies.

Weak ChannelPlus UHF channel

… If the TV has a separate UHF

input, be sure that it is connected.

Herringbone interference on modulator channel (diagonal lines):

You may have chosen a channel number that is not completely
vacant. Distant UHF stations may not be watchable, but will cause
interference if you try to create a new channel at the same frequency.
Also, cable companies often have extra signals where there should
be none. Try moving the modulator channel to another number. You
may have to add a low pass filter to remove the cable company noise.
If the filter does not work, try adding a DC-block to remove common
mode interference.

Herringbone interference on many channels, including
modulated channel (disappears when you remove the
CATV/antenna feed)

: The RF amplifier can be overloaded by
abnormally strong signals. Often, you can cure the problem with a
simple attenuator. Use a variable attenuator and try to find a signal
level where the interference just disappears. Sometimes, the problem
is one station is far stronger than the rest. In this case, attenuating all
of the signals with a simple attenuator may cause the desired stations
to be weak (snowy). You must reduce the strength of the only
offending station. A common FM trap will help if the problem is a
nearby FM tower. If the problem is a nearby TV station, often the
station management can provide suitable filters.

Audio volume is low

… The left and right audio inputs are combined
for monaural. For proper audio level, both right and left inputs must
be used. If you have a mono source, connect it to both right and left
inputs using an RCA ‘Y’ connector.

No color on ChannelPlus channels

… You may have chosen the

incorrect cable standard. Not all televisions can accommodate the

1.25MHz frequency difference between the H and I cable standards.
See the section on programming.

The H881 modulator combiner hub work like a zero-loss combiner. The
modulated signals you put on the inputs will appear on the outputs with
about 1dB of gain. When the output of the H881 is connected to one of
the modulator inputs of the H838, signals will automatically appear on the
outputs of the H838 at an FCC legal level.

Note: The H881 does not pass IR information. To control a modulator
from a remote location, use a modulator with IR control such as the H564
and connect to the B+pwr input of the H838.

Specifications: typical @ 25°C ± 5° C

Number of modulator inputs 8
Gain, modulator input to output ~1
Bandwidth 400-860MHz
Nominal modulator input level 25dBmV
Maximum number of modulated channels 16
Power supply (370-086 included)

15 VDC @ 300mA

dB

3 RG-6

2 RG-6

Multiplex Technology, Inc., Brea, CA 92821Multiplex Technology, Inc., Brea, CA 92821

600-177 Rev. A600-177 Rev. A

TM

Home office - phone, TV, ethernet, satellite receiver, cable modem, hi-speed data
Media center - phone, TV, ethernet, satellite receiver, AV modulators, hi-speed data
Typical room - phone, TV, ethernet, satellite receiver

Compatible

Best …

ethernet,

phone, TV, ethernet, cable modem

cable modem

Home office ­Media center - phone, TV, satellite receiver, AV modulators
Typical room - phone, TV, ethernet

Better …

ChannelPlus Enclosures, Modules,

Accessories & Wall Plates

Home office - phone, TV,
Media center - phone, satellite receiver, AV modulators
Typical room - phone, TV

Good ...

Service center
enclosures

A full line of OpenHouse compatible
enclosures, from simple, inexpensive
mounting plates to high capacity in-wall
cabinets. AC outlets can be mounted
inside the cabinets using a UL listed
accessory.

3 Cat-5

2 Cat-5

3 RG-6

3 RG-6

3 Cat-5

2 Cat-5

2 RG-6

1 RG-6

2 Cat-5

2 Cat-5

Best

Better

2 RG-6

Home Office

1 Cat-5

3 RG-6

1 Cat-5

Media Center

UTP

H881

1 RG-6

Typical Room

Modulator Combiner Hub

1 Cat-5

Good

Starter systems

RF splitters and telephone punch
downs. When it is time to upgrade,
just snap this module out and
replace with one of more of the
more sophisticated units.

OUTINOUT

Telco

R

2

T
R

1

T

IN

IN

ComboHub (2 lines x 6 phones, 1input x 4 televisions)

532-230 5MHzto1000MHz

SPLITTER

TelephonesFrom

OUTINOUT

OUT

COMBINER

ChannelPlusmodel H801

IN

R

the service center to the rooms indicated.
We recommend the following pre-wire schemes . Run these wires from
VCR or a satellite receiver.)
modulator creates new TV channels for front door camera, DVD player, a
cable), satellite dish, cable modem, or AV modulator signals. (An AV
data or 1 to 4 telephone lines. RG-6 coax handles television (antenna or
entertainment: Cat-5, 4-UTP (4 nshielded wisted airs) wire handles

DataHub (8 cables, TIA-568A) Category 5 Compliant

ChannelPlusmodel H628

Data hubs

Termination blocks for the CAT-5 cables,
Ethernet hubs. Bring the Internet to any
room in the home. Or create a home data
network.

wiring.) Two types of wire are used for communication and
directly to the service center location.(This is known as ‘home run’
The cables in an OpenHouse run from the various rooms of the house

Wiring a house for OpenHouse

Telephone hubs

Connections for 1-4 phone lines to
every room. Starter hub adds RJ­31X jack for security system dialer.

From
Telco

R

4

T
R

3

T
R

2

T
R

1

T

TelephoneMaster Hub (4 lines x 6 phones)

Expansion

Ports

RJ31X

Out

ChannelPlusmodel H616

Telephones

Wall plates

Wall plate systems for all rooms. The typical room gets TV
and telephone. The Home office wall plate adds data ports.
The media center wall plate adds satellite feeds.

ChannelPlus

TM

multiplex

technology, inc.

3001 Enterprise Street, Brea, CA 92821-6213, U.S.A.

714-996-4100 800-999-5225 FAX [phone] www.channelplus.com

*

*

Warranty

Multiplex Technology, Inc. warrants this product to be free from defects in materials and workmanship
for a period of one year from the date of purchase or MTI will repair, or at its option, replace the
defective product. To obtain warranty service, call MTI for a return material authorization (RMA)
number and return theproduct prepaid to Multiplex Technology, Inc., 3001 Enterprise Street, Brea, CA

92821, Attention: Customer Service. Please put the RMA number on the outside of the carton.

Any implied warranty arising from the sale of the product including implied warranties of
merchantability and fitness for purpose are limited to the warranty stated above. MTI shall not be
responsible for losses or damages or expenses, whether direct, consequential or incidental arising
from theuse of or the inability to use this product. Some states do not allow limitations on how long the
implied warranty lasts or the exclusion or limitation or incidental or consequential damages, so the
above limitations and exclusions may not apply to you. This warranty gives you specific legal rights,
and you may have other rights which may vary from state to state.

®

*

Coax panels

Distribute antenna or cable TV to every
room of the house. Some models include
bi-directional amplifiers for interactive cable
systems. Some models include
inputs and

IR engines.

modulator

AV modulators
(for service center)

Create a new TV channel for a front
door camera. Some models feature
Cat-5 input connections.

AV modulators
(for media center)

Create new TV channels for DVD, VCR,

®

select

program

DCBA

model 5445 quad digital modulator

pll frequency control

or a satellite receiver. These modulators
sit in the media center. Some offer true
MTS stereo.

IR Accessories

Control video devices from any room.

New OpenHouse products are added all the time.

Visit our website to learn more: www.openhousesystem.com