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Author Topic: Teflon sleeving?  (Read 1430 times)
NORTHCOUNTRY
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« on: July 03, 2007, 11:33:52 AM »

Teflon Sleeving, ever use it?  When is in necessary?
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K0BG
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« Reply #1 on: July 03, 2007, 11:45:15 AM »

Depends on what you're up to. Some times, like balun building, adding sleeving will actually degrade performance. Sometimes is improves performance. All of this is based on the impedance of the wires in question.

In high voltage situations, it maybe necessary. If you were winding a mobile antenna loading coil, you wouldn't want to sleeve it.

So, what are you contemplating?

Alan, KØBG
www.k0bg.com
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NORTHCOUNTRY
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« Reply #2 on: July 03, 2007, 11:50:01 AM »

HV Power Supply for GU-74B
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WB2WIK
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« Reply #3 on: July 03, 2007, 01:31:49 PM »

Teflon sleeving (or "spaghetti") surely has applications in homebrew projects, around high voltage.  However for building a HV power supply, I just use high voltage insulated wire!  Using stranded (like #20 AWG, with lots of strands) wire with flexible HV insulation is easier to use than sleeving and you can get HV wire with insulation good to at least 20 kV while still having great flexibility.

Ordinary "test lead wire" like what comes with professional VOMs and DVMs is good for at least 5 kV and it's not expensive at all.

WB2WIK/6
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KM1H
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« Reply #4 on: July 06, 2007, 03:42:24 PM »

Many of the commercial amps that hams buy use plain old stranded wire for HV up to 3KV or so. It always makes me nervous seeing such haphazard safety procedures and I sleeve them with Teflon when I have them in my shop for service or conversions to 6M. Wire insulation degrades over time and someday someone is going to get hurt working around 20-50 year old products.
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