[Lowfer] Porcelain Insulators

Tue, 20 May 2003 16:28:54 -0400

These insulators are small (only about 2" long) and won't have adequate
leakage distance for LF transmitting use, even Part 15, unless in a series
string. Also they are dry process which is somewhat porous...good for
non-critical apps only. Porcelain Products makes larger units out of wet
process porcelain which would be much better for guy use on a tower which is
to be used as the radiator. They should still be seriesed. Check
electric-parts.net, they have a wide selection of all types of insulators,
good prices and no min. order (I'm not affiliated, just a satisfied
customer). The best for transmitting antennas are the so-called 'rubber
chickens' (polymer dead-end strains). They come in 15-45 kV ratings and have
very low capacitance, which is desirable to avoid too much shunt capacity in
electrically-short antennas. These are being used in modern NDB flattop
antenna construction. They can also be used in tower guying apps up to
15,000 lbs. if you have serious voltage to hold off (i.e., LF/VLF high power
xmitting.)
73 es good insulating :-) Jon

-----Original Message-----
From: Peter Barick <[email protected]>
To: [email protected] <[email protected]>
Date: Tuesday, May 20, 2003 3:53 PM
Subject: [Lowfer] Porcelain Insulators

>
>All,
>
>While browsing antenna tower parts, I noticed this source for porcelain
>insulator at $2.50. It seems large for guy wire apps.
>
>http://www.reprise.com/ash/clients2/rohn/specials.asp
>
>Also noticed that Rohn makes an insulated 25G tower section having knob
>insulators at each leg and comprising 2 reg. tower sections of 10 feet
>each. Cost $800+, plus shipping. So straight sections at $90 don't seem
>that high all of a sudden.
>
>Ah these toys are getting expensive.
>
>Peter
>
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