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Re: multiple gap question
The G-10 isn't cheap but it is outstanding in its heat resistant and HV
creepage characteristics so it really is about the best choice. McMaster
Carr and US Plastics are average in pricing for G-10.
We silver solder the top and bottom wires on usually using a 6 AWG fine
stranded welding cable. We then pound the 1/8th inch sheets of copper plate
between two 3/4 inch thick steel plates. The torch sometimes warps the
upper and lower sheets slightly but a few good wacks between the steel
plates usually puts things back in order.
Silver solder has excellent RF characteristics. Remember, even though this
is an RF circuit the old Ohm's Law factors still apply --- that current will
be limited in any particular area where your resistance is the highest in
the series part of the circuit --- and lead/tin type solder will not give
the best resistance factors at RF frequencies. Silver has very good RF
properties even in small percentages, hence the silver solder.
Regards,
Dr. Resonance
-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Tuesday, February 15, 2000 9:21 PM
Subject: Re: multiple gap question
>Original Poster: "Rick Kirby" <rkirby-at-earthlink-dot-net>
>
>Tesla List wrote:
>
>> Original Poster: Parpp807-at-aol-dot-com
>>
>> For Dr R,
>> That's interesting.
>> The first big shock came when I checked US Plastics prices on the G-10
>> phenolic sheets.
>> Can you suggest a source for the G-10 in a quantity a little less than 16
sq.
>> ft?
>>
>> The rest of the project is altogether simple sounding. I see a copper &
>> phenol sandwich
>> lightly clamped to a piece of lexan. Is the attachment of the leads
critical
>> in any way?
>>
>> The 0.01- inch spacing seems too close?????
>>
>> Thanks.
>>
>> Happy Day,
>> Ralph Zekelman
>
>Ralph,
>
>McMaster-Carr Cat. has G10 (Garolite) sheets as small as 12" x 12" and at
>1/4" thick it is around $25.16 per sheet.
>
>Rick Kirby
>
>
>
>