Transmission1

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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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

Bare copper solid wire.
Chris

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

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

ch25 wrote:Bare copper solid wire.
Chris

Why?

Cheers chaps, seems to be ok either way ?

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

excuse me, any prove of that?

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.

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

Plenty in antenna design books.

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.

Oh dear what a knowledge... Sure you are going to drive 400 watts on a thin wire in the loft..

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.

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

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

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