Wire inverted V materials ?

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knobby
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Wire inverted V materials ?

Postby knobby » 06 Jul 2017, 16:58

Hi all,
going to make a 90 degree inverted V from twin and earth cable, should I use the blue wire for the centre coax side and the brown for the braid side ?

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.......
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Only kidding ! but will it work best with the copper bare or with the insulator left on ?
It will be indoors in the loft.

Thanks for the great forum

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ch25
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Re: Wire inverted V materials ?

Postby ch25 » 06 Jul 2017, 17:04

Bare copper solid wire.
Chris

knobby
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Re: Wire inverted V materials ?

Postby knobby » 06 Jul 2017, 18:26

:D Looks like I've got a lot of stripping to do

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NightProwler
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Re: Wire inverted V materials ?

Postby NightProwler » 06 Jul 2017, 19:51

Just use the blue and brown wires as they are. I done the same in my attic and worked all over Europe on 15 watts with it :thumbup:
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Re: Wire inverted V materials ?

Postby Kaliphan » 07 Jul 2017, 16:04

ch25 wrote:Bare copper solid wire.
Chris

Why?

knobby
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Re: Wire inverted V materials ?

Postby knobby » 07 Jul 2017, 19:08

Cheers chaps, seems to be ok either way ?

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ch25
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Re: Wire inverted V materials ?

Postby ch25 » 08 Jul 2017, 10:50

Because of skin effect. I use enamelled transfromer wire for all my wire antennas. Cheap and reliable.

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26TM5890
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Re: Wire inverted V materials ?

Postby 26TM5890 » 08 Jul 2017, 19:13

excuse me, any prove of that?
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Admiral
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Re: Wire inverted V materials ?

Postby Admiral » 08 Jul 2017, 21:19

It depends on what you're going to use it for chap, for a simple HF RX antenna then insulated cable is absolutely fine, if you intend on sticking 10w up it then also fine, stick 400w up some 5amp insulated flex and you could burn your house down.
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ch25
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Re: Wire inverted V materials ?

Postby ch25 » 09 Jul 2017, 12:50

26TM5890 wrote:excuse me, any prove of that?

Plenty in antenna design books.

Kaliphan
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Re: Wire inverted V materials ?

Postby Kaliphan » 10 Jul 2017, 13:27

ch25 wrote:Because of skin effect. I use enamelled transfromer wire for all my wire antennas. Cheap and reliable.


Oh right, I was always told that was an old wives tale and it had almost no measurable effect at all unless it was over an eighth of a wavelength thick, a bit over 2 metres diameter at CB frequencies.

If you've got a proper reference that says different I'd love to see it.

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26TM5890
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Re: Wire inverted V materials ?

Postby 26TM5890 » 10 Jul 2017, 17:45

Oh dear what a knowledge... Sure you are going to drive 400 watts on a thin wire in the loft..
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Sam P
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Re: Wire inverted V materials ?

Postby Sam P » 10 Jul 2017, 18:47

Kaliphan wrote:
ch25 wrote:Because of skin effect. I use enamelled transfromer wire for all my wire antennas. Cheap and reliable.


Oh right, I was always told that was an old wives tale and it had almost no measurable effect at all unless it was over an eighth of a wavelength thick, a bit over 2 metres diameter at CB frequencies.

If you've got a proper reference that says different I'd love to see it.



In fairness, mate, if it wasn't for skin effect the T2LT antenna (as an example) just wouldn't work.

However I can't see why skin effect has got anything to do with insulated wire.... it's the conductor that we're interested in.

Every tactical and operational wire dipole system I've used (and that's a fair few) has had insulated wire.
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ch25
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Re: Wire inverted V materials ?

Postby ch25 » 10 Jul 2017, 20:00

Millions of flies eat $hit, it does not mean it is correct.

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Sam P
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Re: Wire inverted V materials ?

Postby Sam P » 10 Jul 2017, 20:16

ch25 wrote:Millions of flies eat $hit, it does not mean it is correct.



It's entirely correct, if you're a fly.
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