Not Quite the same Problem, but related.

Most motor homes use a 12 Volt Inverter powered Flourescent Light .These
inverters operate in the 15 Khz range ! (More efficient then 60 cycle)
I was surprised to find out my Infra Red Remote Controller was not working
properly (ya , I put in new batteries and tried it close up) but it would
not operate at any distance.

To make a long story short, I had to shield the IR sensor in my satelite
dish receiver, from the Flourescent Room light Fixture.

Under normal conditions flourescent Lighting is driven by 60 cycle power,
and I am reasonably sure that the sensor circuits ar well filtered to block
this 60/120 cycle light interference. (Hi-Pass filter circuit)

In the case of 12 Volt lighting, these tubes are driven by a ~15 Khz
inverter and will appear as a 15/30 Khz modulated light ( modulation
invisible to the Human eye). .

This modulated signal even though in the visible light range, will leak
through the IR sensor and block the detector from responding to the ~15/30
Khz IR signal from the Remote Controller. Reducing the strenght of the
interfereing
room light by placing a magazine on top of the satelite receiver and shading
the detector , eliminated the problem..

BTW I like the LCD TV idea, I suspect your TV is a Trinitron, eg SONY . I
recall a rumour 20 or 30 years back that it produced a strong signal around
100/200 Khz, , the switching frequency for the trinitron screen. this would
explain the 10~200 pips per line you see in the interference.

I also like the DVD idea , should not be bothered by Trinitron .

All of their Remote Controls will still be bothered by 12 Volt Flourescent
lamps however !

Yukio YANO

"sandy" wrote in message
om...
We've got a problem with our VCR that is about to drive us nutty! Our
motorhome has a TV/VCR compartment forward over the driver/passenger
seats. Cabinet is metal and you can see a jumble of TV cables and
other wires that appear to go to exterior lights. The TV, Amplified
antenna & VCR wires are all connect3d to a little black box
(Magnadyne); Power is from an inverter which we installed.

The TV works fine but the VCR has really annoying interference in the
way of wide rolling lines (composed of colored dots or thingies that
look like a line up of golf tees). When you take the VCR out of the
cabinet, it works fine. We've tried exchanging the VCR for another
and it still gets interferrence. We've tried expensive shielded
cables and it didn't help at all. We'd really, REALLY appreciate any
suggestions as to what the problem is and how we can fix it. We've
been pretending to fix it for over a week now and my husband is about
to drill holes in the dash and install the VCR there (and have cables
dangling from the dash to the overhead). Can you help!!!!!!!!!!?

Thanks!

Sandy