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17th Feb 2024, 7:51 pm | #1 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 14,014
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Egg insulators.
Been doing some HF-antenna stuff recently, and needed a couple of end insulators. Alas the traditional ceramic 'eggs' are no longer available, but my local agricultural supplier has packs of five quite chunky plastic electric-fence insulators for less than £6 per pack.
I've yet to thrash them as dipole-ends dealing with 150W of heavily speech-processed SSB but they look kinda chunky, as would be expected to deal with Kilovolt electric-fence applications. A little CV785/1T4 B7G pentode is included in the second pic to give an idea of scale.
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I'm the Operator of my Pocket Calculator. -Kraftwerk. Last edited by G6Tanuki; 17th Feb 2024 at 8:01 pm. |
17th Feb 2024, 8:11 pm | #2 |
Nonode
Join Date: Jun 2007
Location: Coulsdon, London, UK.
Posts: 2,172
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Re: Egg insulators.
I would always go for the black version.
I have seen evidence of surface degradation of the white insulators when they are used for farmyard electric fences. I guess it is due to ultra-violet light damage. |
17th Feb 2024, 8:18 pm | #3 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 14,014
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Re: Egg insulators.
Good point: these ones are for some short-term experiments where I needed to tie-off radials for a 14/28MHz quarter/half-wave elevated vertical, so they won't need to survive more than a single summer's worth of UV.
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I'm the Operator of my Pocket Calculator. -Kraftwerk. |
17th Feb 2024, 8:44 pm | #4 | |
Dekatron
Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,133
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Re: Egg insulators.
Quote:
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17th Feb 2024, 11:07 pm | #5 |
Octode
Join Date: Mar 2020
Location: Blackburn with Darwen, Lancashire, UK.
Posts: 1,573
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Re: Egg insulators.
In the tech specs for them it does say UV resistant?
Sounds like a good find. Adrian |