Wire inverted V materials ?

Do you enjoy making your own equipment or antennas? Discuss construction and design in here.
User avatar
Admiral
Legend
Legend
Posts: 9692
Joined: 08 Mar 2011, 21:20
Call Sign: 26TM157
Location: MK-UK

Re: Wire inverted V materials ?

Post by Admiral » 10 Jul 2017, 21:39

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.
Winner of the 2017 IBTL 'Summer Sizzler' competition

User avatar
Buick Mackane
Legend
Legend
Posts: 6406
Joined: 21 Aug 2012, 17:30
Location: A Country Called Scotland

Re: Wire inverted V materials ?

Post by Buick Mackane » 11 Jul 2017, 14:39

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

Image

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

Kaliphan
Regular
Regular
Posts: 7
Joined: 26 Aug 2016, 09:35

Re: Wire inverted V materials ?

Post by Kaliphan » 11 Jul 2017, 15:10

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.

User avatar
ch25
Super Member
Super Member
Posts: 142
Joined: 03 Dec 2016, 11:07
Call Sign: n0call

Re: Wire inverted V materials ?

Post by ch25 » 11 Jul 2017, 19:03

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.

User avatar
nordhavn
Radio Addict
Radio Addict
Posts: 563
Joined: 07 Jan 2008, 17:23
Location: s/e

Re: Wire inverted V materials ?

Post by nordhavn » 11 Jul 2017, 21:01

Which swg wire would you recommend..... 18 or 17 swg?

User avatar
Buick Mackane
Legend
Legend
Posts: 6406
Joined: 21 Aug 2012, 17:30
Location: A Country Called Scotland

Re: Wire inverted V materials ?

Post by Buick Mackane » 11 Jul 2017, 21:13

nordhavn wrote:Which swg wire would you recommend..... 18 or 17 swg?
The thicker the better, Improves bandwidth.
Radio Someone Still Loves You

User avatar
Sam P
Super Member
Super Member
Posts: 122
Joined: 24 Feb 2017, 21:41
Call Sign: 26DR340

Re: Wire inverted V materials ?

Post by Sam P » 11 Jul 2017, 21:28

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.
Ubique Loquimur

knobby
Regular
Regular
Posts: 33
Joined: 17 Aug 2008, 07:29

Re: Wire inverted V materials ?

Post by knobby » 13 Jul 2017, 12:38

Blimey, I think I'll do one leg with the insulator on and one with it off, just to be safe !

User avatar
nordhavn
Radio Addict
Radio Addict
Posts: 563
Joined: 07 Jan 2008, 17:23
Location: s/e

Re: Wire inverted V materials ?

Post by nordhavn » 13 Jul 2017, 14:55

Would this stuff be any good ? 292071609442 seems reasonable priced .

JB
Regular
Regular
Posts: 21
Joined: 11 Feb 2007, 04:23

Re: Wire inverted V materials ?

Post by JB » 07 Aug 2017, 20:03

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.

User avatar
prettypolly
Radio Addict
Radio Addict
Posts: 812
Joined: 09 Jan 2013, 01:57
Call Sign: 26FB185

Re: Wire inverted V materials ?

Post by prettypolly » 08 Aug 2017, 11:35

lower the swg the thicker it is

Kaliphan
Regular
Regular
Posts: 7
Joined: 26 Aug 2016, 09:35

Re: Wire inverted V materials ?

Post by Kaliphan » 29 Aug 2017, 15:47

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.

2e1mpc
New User
New User
Posts: 3
Joined: 03 Sep 2017, 17:01
Call Sign: 2e1mpc

Re: Wire inverted V materials ?

Post by 2e1mpc » 03 Nov 2017, 07:29

Leaving the insulation on the wire just alters the resonant lenth. Thatsxall

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest