[TriLUG] Television & RF interference -- yes computer related -- I think

[James Jones]

J. Mack -- During the live event, the Mac Monitor showed the beat
pattern and it was present in the recording as well. The monitors for
the individual cameras didn't show it ( according to producer of the
video ).

****** removed the requirement that consumer devices have RFI and TVI
filters on them.

Does anyone make  filters for ac power? Would an Uninterruptible Power
system have enough RFI/TVI filtering to help?

G. Starling -- Thanks for the hints. Thremoved the requirement that consumer
> devices have RFI and TVI filters on them. e beat pattern is a constant pattern. There is no constant to the interference. On for a few minutes, off for a few, back on -- but not the same length as the first, etc.

Thank you all for your help.

One of these days, I will get my ham license.

jcj

On Wed, Mar 6, 2013 at 9:15 PM,removed the requirement that consumer
> devices have RFI and TVI filters on them.  Joseph Mack NA3T <jmack at wm7d.net> wrote:
> On Wed, 6 Mar 2013, James Jones wrote:
>
>> A Friend asked for me to help trouble shoot their church video problems.
>> They video recorded their sermon on a Mac from a video switcher through
>> several pieces of equipment to their mac. All their monitors had clear
>> pictures of the video, but the Mac had a beat pattern in the video.
>
>
> did the recording have the beat, or just the monitor on the Mac?
>
>
>> The beat pattern would show for a couple of minutes, then clear up for a
>> few and then back again. I am thinking it might be walkie talkies, handhelds
>> or some nearby rf communication center of some sort. Since it happens only
>> on Sunday morning and not during their Wednesday evening service, I believe
>> it might be a ham operator, cb'er, etc.
>
>
> this could be a bit of work to track down.
>
> First thing you need to know is that at the request of the electronics
> industry, the Regan administration removed the requirement that consumer
> devices have RFI and TVI filters on them. As a result you'll see notices on
> consumer electronics saying "this device must accept all interference". This
> saves the industry about 50c/device and lets the consumer (you) handle the
> problem. The rest of the world didn't fall into line with the USA, at least
> initially, so the devices shipped elsewhere, still had the filters. I don't
> know what the situation is now. I expect Germany will still require them,
> even if no-one else does.
>
>
>> Need any and every thought on troubleshooting this problem.
>
>
> first thing you can find is whether the interference is coming over the
> wires or through the air.
>
> wires: wind the cables around ferrite cores, or put ferrite blocks around
> the wires (you can get them at Radio Shack). If it works you're done. If it
> doesn't work, the signal still could be come over the wires. If it's coming
> over the wires, change the wiring (if you can) to see if it makes any
> difference. You might have to change the order of devices.
>
> air: put a metal cage around (and under) the Mac. Expanded Al mesh would do
> it. You can fold it over a table edge to make a box and lid.
>
> Joe
>
> --
> Joseph Mack NA3T EME(B,D), FM05lw North Carolina
> jmack (at) wm7d (dot) net - azimuthal equidistant map
> generator at http://www.wm7d.net/azproj.shtml
> Homepage http://www.austintek.com/ It's GNU/Linux!
> --
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