Channel Vision Stereo Receiver TV Wont Tune High Enough to get Modulated Channel

modulated channels.

A)If the modulated channels are good, use a low pass filter to "clean-up" the incoming frequencies to be modulated.

B)If the modulated channel does not improve after disconnecting the local channels, evaluate signal loss of modulator through the splitters and cable length of the system. Amplify after the combiner if needed.

C)Also check the connections between modulator and the combiner for leakage or the cable braid is touching the center conductor.

2.Make sure the attenuator adjustment on the back of the modulator is turned to maximum output power.

3.Check output strength with field strength meter.

4.Connect modulator directly to TV and check picture quality.

5.Check bandwidth of all splitters and amplifiers for 1GHz capability.

6.Place TV cable setting on standard, NOT HRC or IRC.

TV Won't Tune High Enough to get Modulated Channel

1.Use an external tuner i.e. VCR or a Cable Box converter tuner (Channel Vision Model #1172) to allow the TV to view a modulated channel on channel through the external tuner.

2.If the modulated channel is beyond the capabilities for that TV, the TV will not work with the system.

Cable Company Box Won't Pass a Modulated Signal

1.Connect modulator directly to TV and verify the modulator is sending a signal the TV can receive.

2.Use model 3101 Cable Box Combiner Kit to route the modulated signal around the cable box. See schematic page.

Cable Company Uses All Available Channels

1.Use a low pass filter (3102) to block out channels 80 and above for clean modulation (won't effect channels 95-99).

2.Call for pricing on a custom filter to block out a specific channel or multiple channels.

Modulated Picture is Too Bright or Washed Out

1.Slide impedance switch to 75Ω position.

2.If modulator is a CVT set top style, adjust video level adjustment potentiometer on the bottom of the chassis.

3.If using a camera, check positioning of the lens to be sure it's not aimed at the sun or a reflection.

4.Adjust camera lens - see lens manual.

Modulated Picture is Too Dark

1.If baseband video is being split with a Stereo Loop Kit or loop through quad, set impedance matching switch (termination switch) to 1ΚΩ.

2.If modulator is a set top style, adjust video level adjustment potentiometer on the bottom of the chassis.

3.If the video source is not being split, check input source directly into a TV.

4.Adjust the video level adjust pot on the chassis of the set top units to the proper brightness.

5.Check all connectors for 75Ω.

Noise on the Audio

1.Insert grounding block in line and ground coax cable before it enters the TV.

2.Use professional grade audio/video interconnect between the components and the modulator.

Audio is Too Low

Use a Y-Connector to combine the left and right audio before entering the modulator.

Herringbone in Picture on Modulated Channel Disconnect modulator from local channels an check modulated channel.

A)If there is programming move the modulated channel.

B)If the picture is snowy, use a #3102-78 low pass filter to block noise or data coming in from cable

company.

C)Separate modulated channels by two channels.

Horizontal Bars Rolling Through TV Picture

1.Check for a component of the system to introduce DC power into the system. Disconnect that component and

check TV. If the hum bars stop, use a DC blocker down stream from that component to block the power from getting to the TVs. 2. If the rolling is only on the modulated channels,

check for impedance mismatch by adjusting the video level adjustment pot.

Vertical Bars Rolling Through TV Picture
Check for AC power getting on the line. Use a
ground breaker in line.
Black and White Lines on one Local Channel
Move modulated channel up to a new channel. If
problem persists and all of the inputs of a	O u c h!!!
multiple input modulator are not being used,
check default channels on modulator to see if
default channel is set to the same channel that the
problem channel is set to.

Flashing at the Top or Middle of TV Picture

1.If flashing is on modulated channels, turn up

attenuator/down gain of modulator.

2. If flashing is on local channels turn down gain or attenuate output of amplifier.

3.Install filter #3102-78 to clean up channels.

Picture is Tearing

Possible impedance problem. Check that impedance switch is set to 75Ω.

Ghosts on the Picture

1.Terminate all unused ports with 75Ω terminator model 2101.

2.Check for low quality combiner in system. Replace with high isolation combiner, HS model combiner.

3.Check the type of coax used in system. Inadequate shielding in coax will cause ghosting. Pull new coax (RG6 quad).

Low Channel Pictures are Good, High Channel Picture is Grainy

1.Place a tilt compensator in line after the amplifier and increase amplifier gain until the higher channels look good.

2.Check frequency specifications on all splitters and amplifiers in system. Replace any that are not broadband 5MHz to 1GHz.

Low Channels are Wavy Vertical Lines, High Channels are Good

1.Unplug the modulator

a)Channels look good: problem is beat frequencies or unbalanced cable vs. modulator.

1.Decrease modulator power by adjusting attenuator (red knob on back) or use external attenuators before it is combined with the cable TV signal.

2.Use a 9 or 12dBmV tap in reverse instead of the supplied