Multiplex Technology CHANNEL PLUS 3445 User Manual download pdf (Page 3)

Things to watch for:

No picture

Weak ChannelPlus UHF channel

Audio volume is low

… Verify that the video source is on and is producing a video signal. 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.

… If the TV has a separate UHF input, be sure that it is

connected.

… 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.

See the section on programming.

lightIR DATA

IR DATA

LEDs blink

Herringbone interference on ChannelPlus channel (diagonal lines)

Herringbone interference on many channels, including ChannelPlus

channels (disappears when you remove the CATV/Ant feed)

No color on ChannelPlus channels

... You need to have one unused channel space between channels. The display will

blink if you have made an ‘illegal’ choice. See the section on programming.

...

You may have chosen a channel number that is not completely vacant. Distant UHF stations may

be un-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 ChannelPlus channel to another number. You may have to add a low pass filter to

remove cable company noise. If a filter does not work, try adding a DC-block to remove common

mode interference.

… 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 that is far stronger than the rest. In this case

attenuating all of the signals with a simple attenuator will cause the desired stations to be weak

(snowy). In this case you must reduce the strength of only the 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.

… 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.

Infrared Remote Control Problems … Use the red light on the side of the modulator

section as a trouble shooting aid. This light will blink as remote control signals are relayed.

If the light seems to indicate proper operation, but the component is not being controlled,

the IR emitter may be mis-located. Be sure the emitters are in front of the IR sensor.

IR DATA

If the light is on constantly, one or more IR targets is receiving electrical or optical noise. At the

modulator section unit, begin to disconnect the outputs to the TVs until the goes off.

This will tell you which IR target is the source of the noise.

Next cover the front of the offending IR target. If the light turns off, the IR target is

‘seeing’ a source of IR noise, such as a solid state flourescent lamp. If the light does not go out,

the problem may be radiated electrical noise from the TV. Reposition this IR target. If

repositioning the IR target does not help, the TV may be conducting noise from its input. Place a

DC block between the IR target and the TV.

IR DATA

Simple DC-block for RF Inexpensive 0-20dB attenuator

CH C

CH D

VIDEO AUDIO L AUDIO R

CH A

CH B

VIDEO AUDIO L AUDIO R

OUTPUT

600mA

15VDC

POWER

Model 3445

Sample System Diagram

SATELLITE

RECEIVER

VCR

DVD

VCR

12:00

Video/audio

outputs

Video/audio

outputs

Video/audio

outputs

CCTV Camera

at front door

CATV/Antenna

In this system, CATV or antenna

channels are available on all TVs. In

addition the following channels have

been added:

Channel 66 - Front door channel

Channel 68 - VCR

Channel 70 - Satellite receiver

Channel 72 - DVD player

RG6 coax

preferred

RF section

(Distributes to as many as 8 TVs)

To more TVs

Any or all TVs may have

a model 2133 IR Target

Control the DVD,

DSS or VCR from

any room.

Model 2173 IR emitter repeats

what the IR target ‘sees’ in the

other room.

Use only shielded 75 ohm coax

Attach the IR emitter directly

over the IR sensor.

Remove jumper for Hi-Z

(See manual)

ABCD

1 2 3 4

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Multiplex Technology CHANNEL PLUS 3445 User Manual Page 3

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