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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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 Posted: Tue Feb 09, 2010 3:09 pm Post subject: Radio Noise |
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Sorry Clint but no I was only trying to illustrate that some things especially electronics work for unknown reasons.
Noel
From: owner-kitfox-list-server(at)matronics.com [mailto:owner-kitfox-list-server(at)matronics.com] On Behalf Of Clint Bazzill
Sent: February 9, 2010 3:30 PM
To: Kitfox list
Subject: RE: Radio Noise
You have got to be joking.
Clint
> From: noelloveys(at)yahoo.ca
> To: kitfox-list(at)matronics.com
> Subject: RE: Radio Noise
> Date: Mon, 8 Feb 2010 22:51:20 -0330
>
> --> Kitfox-List message posted by: "Noel Loveys" <noelloveys(at)yahoo.ca>
>
> Shielding... grounded only to the end closest to the source.. If you ground
> the shield at both ends what you have done is made an unbalanced conductor
> like a piece of coax. As with coax there is a capacitance in the line when
> it is grounded at both ends. This is why they say to only ground at one end
> and that end usually has the best ground at the source end.
>
> Years ago I was involved in a volunteer position at the local cable station.
> We did several programs which were all recorded on 1/2" Beta video machines
> and then edited down to the program length. Our editing suite had a problem
> that after a video dub of five minutes we would get a glitch in our video.
> The suite was in a room with a faraday screen that was connected to a close
> to perfect ground ( a 4X8'piece of steel buried ten feet below the surface
> of the ground... The steel had 20'radials attached to it) Sony was so
> upset over this they actually sent technicians from Japan to check out our
> installation. After a week of trying everything they could think of one of
> the technicians attached an additional ground between the frame of the video
> board and one of the audio boards and the glitch stopped. No one knows why
> since both boards were properly grounded. The bond between the two boards
> worked so well that future models of the Beta editing suite had the extra
> ground included.
>
> When it comes to electronics there are rules and just like everything else
> there are exceptions that make the rules.
>
> Noel
>
>
>
> --
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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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helili(at)chahtatushka.ne
Guest
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| Posted: Tue Feb 09, 2010 4:02 pm Post subject: Radio Noise |
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On many vertical radiators, that produce gain in comparison to a 1/4 wave
radiator, the impedance matching coils for such antennae put the center
conductor of the feed coaxial cable at DC ground potential. In other words,
if you place one probe of an ohm meter on the radiator, and touch the other
one to chassis ground, you will read continuity, hence the center conductor
of the coaxial cable is at DC ground potential. It will not be at RF ground
potential.
John Hart
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