Channel Vision E-1200 User Manual download pdf (Page 4)

2. When laying out your system, there will be approximately 5dB of

signal loss per 100' of RG6.

3. Be sure ALL of your splitters and amplifiers are broadband.

Splitters should be 5MHz to 1GHz, and amps should be 40MHz

to 1GHz.

4. Check and make sure that all televisions are set up for the proper

frequency spectrum (i.e. UHF or cable).

5. Make sure that the channels you want to modulate on have “clean

snow“. No lines or interference.

6. Use a low pass filter on every installation to clean up the

frequencies the modulator will be assigned to and keep any

potential interference out of the system. Model 3102, cleans up

channel 64, 84, 105 and above.

7. Allow 1 to 2 channel spacing between modulated channels and

"active" channels.

8. Always compensate for insertion loss with splitters and taps.

There will always be a drop in antenna/cable signal strength

when combining a modulator to an existing system (because of

insertion loss with

the combiner).

9. When combining

an existing signal with

a modulated

signal, make sure

to have equal signal

strength at the point of

the combiner

so one signal does

not degrade the other

and cause beat

frequencies.

10. When possible, use the lowest frequencies available for the

modulated channels. Lower channels (frequencies) have lower

signal loss on the cable runs.

11. When in doubt, run the signal a little high to the television and

use an attenuator to lower the signal strength going into the TV.

Attenuators may be combined (i.e. two -3dB attenuators. will

equal -6dB).

12. Make sure to use a well shielded coax of either RG-6 Quad or

RG-11 for long trunk runs.

13. Use RG59U Coax for composite/baseband video signals only.

14. Combine the modulator into the video distribution system as far

"up-stream" as possible.

15. If the system needs to be amplified use the amplifier as far "up-

stream" as possible.

Trouble Shooting

Trouble shooting any system can make or break the entire

installation. Here are the most common problems and solutions. After

trying these solutions, call 800/840-0288 for 24 hour technical

assistance. Calls before 8am and after 5pm pacific standard time will

be returned by the technician on call.

Snowy Picture : No Modulation

This is a problem of the TV and the modulator not "talking" to each

other.

1. Verify the modulator is set up for the proper TV channel band.

Cable TV or antenna? If the unit uses dip switches to set the

channel band, was the unit powered down during or after the

switches were reset to the proper band? If the unit uses a

jumper check for proper placement.

2. Verify the TV is set up on the proper TV channel band. Use

"Air" for UHF channels or Cable for Ultraband channels . The

TV will have an on screen set-up menu or a switch for this

function. Also make sure the modulated channel isn't blocked

out by auto-programming. To check for the TV being set to the

wrong band, go to the equivalent channel on the other band (i.e.

to check 65 cable try 14 UHF). Add 51 channels for antenna

connection to cable channels.

3. Check TV manual to make sure TV works on channel above 65.

4. Check all connections for a good connection.

5. Check splitters and amplifiers for 1GHz rating.

6. Try another TV, bypass all components and go directly into TV.

Black Picture : No Modulation

In this case, the TV and the modulator are "talking" to each other.

The video signal is not being passed through the system.

1. Verify good connections to the modulator from the video source

i.e. VCR.

2. Check video source (VCR, Sat Receiver etc.) by running the

outputs directly into the video inputs on the TV. Verify video

source is working.

3. Check for power at video source.

4. Disconnect modulator from system:

A) Picture goes to snow, problem is between video source and

inputs on the modulator.

B) Picture stays black, hook up the modulator.

directly to a TV eliminating all the components of the system

and check the picture.

Grainy Local Channels : Good Modulated Picture

1. Disconnect the modulator from the system and connect the local

channel feed directly to the distribution system and check TV

picture quality.

A) If the picture quality is good the insertion loss of the

combiner for the modulator is degrading the local channel

signal. Use a CVT-15PIA to compensate for the insertion

loss.

B) The other alternative is to use a 6dB tap as the combiner, put

the local channel feed on the pass through port for a minimal

loss of signal connect the modulator to the tap off port.

C) If the picture is still bad, check for a bad connection where

Loss Key_______

Coax

RG6 per 100' 4dB

RG59 per 100' 5dB

Splitter

HS-2 3.5dB

HS-3 5.5dB

HS-4 7dB

HS-6 9.5dB

HS-8 11dB

Taps - Pass Thru -1dB

Suggested dB level @ TV

8~15dB

Maximum of 15.5dBmV per

FCC Regulation

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Channel Vision E-1200 User Manual Page 4

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