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Re: Wire inverted V materials ?

Posted: 10 Jul 2017, 21:39
by Admiral
26TM5890 wrote:Oh dear what a knowledge... Sure you are going to drive 400 watts on a thin wire in the loft..
Aha, I see you've managed to slip away from your helper for 5 minutes.

Re: Wire inverted V materials ?

Posted: 11 Jul 2017, 14:39
by Buick Mackane
Admiral wrote: stick 400w up some 5amp insulated flex and you could burn your house down.
Iv'e got two words to say to that, Sh1te and sh1te

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Presuming your talking about mains (240 volt) 5 amp flex that could handle in excess of one kilowatt

Re: Wire inverted V materials ?

Posted: 11 Jul 2017, 15:10
by Kaliphan
ch25 wrote:Millions of flies eat $hit, it does not mean it is correct.
Explain how Antron 99, Sirio Gainmaster, DV27, Firestick etc. etc. etc. work then, they've all got a whopping big lump of insulation around the radiating element.

Re: Wire inverted V materials ?

Posted: 11 Jul 2017, 19:03
by ch25
It is thread about wire antennas mate. I do not have time or will to educate you about antenna design and performance since it is very well covered by plenty of books available to read if you willing to. Most of CB antennas are built against any science and I do not want to waste my time to analyse that curiosity.
Want know more I suggest reading Rothammel antenna book, Low band Dxing and so on.
You will be amazed how little things can make a huge change in your antenna system.

Re: Wire inverted V materials ?

Posted: 11 Jul 2017, 21:01
by nordhavn
Which swg wire would you recommend..... 18 or 17 swg?

Re: Wire inverted V materials ?

Posted: 11 Jul 2017, 21:13
by Buick Mackane
nordhavn wrote:Which swg wire would you recommend..... 18 or 17 swg?
The thicker the better, Improves bandwidth.

Re: Wire inverted V materials ?

Posted: 11 Jul 2017, 21:28
by Sam P
Kaliphan wrote:
ch25 wrote:Millions of flies eat $hit, it does not mean it is correct.
Explain how Antron 99, Sirio Gainmaster, DV27, Firestick etc. etc. etc. work then, they've all got a whopping big lump of insulation around the radiating element.

You're quite right, me ole fruit, aerials like the gainmaster are wire antennas...

The aerial wire of a sloping vee is already surrounded by an effective insulator (air) adding another will have no noticeable impact. In fact it should help with an external antenna as it will slow down oxidisation and keep the wire in good condition.

Re: Wire inverted V materials ?

Posted: 13 Jul 2017, 12:38
by knobby
Blimey, I think I'll do one leg with the insulator on and one with it off, just to be safe !

Re: Wire inverted V materials ?

Posted: 13 Jul 2017, 14:55
by nordhavn
Would this stuff be any good ? 292071609442 seems reasonable priced .

Re: Wire inverted V materials ?

Posted: 07 Aug 2017, 20:03
by JB
Plastic or rubber insulation does have a loading effect on wire dipoles. I once made an inverted V from 3mm diameter mains cable and had to trim about 50mm of each side to get the SWR down.
A great antenna for DX - cheap as chips.

Re: Wire inverted V materials ?

Posted: 08 Aug 2017, 11:35
by prettypolly
lower the swg the thicker it is

Re: Wire inverted V materials ?

Posted: 29 Aug 2017, 15:47
by Kaliphan
JB wrote:Plastic or rubber insulation does have a loading effect on wire dipoles. I once made an inverted V from 3mm diameter mains cable and had to trim about 50mm of each side to get the SWR down.
A great antenna for DX - cheap as chips.
Yeah, about 3%-5% difference in length due to velocity factor changes but nothing else.

Re: Wire inverted V materials ?

Posted: 03 Nov 2017, 07:29
by 2e1mpc
Leaving the insulation on the wire just alters the resonant lenth. Thatsxall