Just a theory Antennas

Do you enjoy making your own equipment or antennas? Discuss construction and design in here.
Post Reply
User avatar
StormShadow
Top Poster
Top Poster
Posts: 1026
Joined: 07 Oct 2013, 11:38
Location: Recently moved to South Bucks

Just a theory Antennas

Post by StormShadow » 20 Apr 2016, 09:06

So you'd have a UHF dipole now compare that with a 40 meter dipole? I'm talking about the thickness of the elements so for example a 70cms dipole is small with thicker elements that you'd have a 40 meter dipole antenna with thin elements... Now this is my theory, having a chunky 40 meter dipole with thick elements, I'm talking at least 2 foot thick elements this will have better performance that a standard wire dipole right?

User avatar
Admiral
Legend
Legend
Posts: 10000
Joined: 08 Mar 2011, 21:20
Call Sign: 26TM157
Location: MK-UK

Re: Just a theory Antennas

Post by Admiral » 20 Apr 2016, 09:12

A 40m dipole with 2ft thick elements? You'd need a leccy pylon to keep it in the air.

As you're talking theory, then the performance shouldn't be any better than a wire dipole at the same height, but the advantage would be that you could probably put 500kw through it whereas the wire would burn up at around 1kw.
Winner of the 2017 IBTL 'Summer Sizzler' competition

User avatar
StormShadow
Top Poster
Top Poster
Posts: 1026
Joined: 07 Oct 2013, 11:38
Location: Recently moved to South Bucks

Re: Just a theory Antennas

Post by StormShadow » 22 Apr 2016, 21:50

Its interesting tho. I made a 2 meter wire dipole when I was first licensed from speaker wire and performed crap. I then tried thicker wire and the performance improved, then when I made a dipole from copper pipe later on that worked even better so I reckon the thickness has some part to play in the performance.

User avatar
StormShadow
Top Poster
Top Poster
Posts: 1026
Joined: 07 Oct 2013, 11:38
Location: Recently moved to South Bucks

Re: Just a theory Antennas

Post by StormShadow » 23 Apr 2016, 00:51

Somebody please tell me that my theory is wrong in regards to thickness of antennas having more performance? I need a few more opinion's to put my mind at rest

2E1IIP

Re: Just a theory Antennas

Post by 2E1IIP » 23 Apr 2016, 15:10

RF travels on the outside (surface skin effect) of the conductor, like any AC voltage however a larger diameter will give a slightly wider bandwidth.

User avatar
dt307
Top Poster
Top Poster
Posts: 1019
Joined: 05 Sep 2014, 16:15
Call Sign: 163dt307

Re: Just a theory Antennas

Post by dt307 » 23 Apr 2016, 15:54

as above the only advantages of thicker elements is
more bandwidth
more power handling
can be made to be self supporting ie 10m dipole
163dt307-chris




“I fear the day that technology will surpass our human interaction. The world will have a generation of idiots.”
― Albert Einstein

User avatar
theEarwigger
Super Member
Super Member
Posts: 403
Joined: 24 Jul 2007, 20:59
Call Sign: M0RZF
Location: Portsmouth
Contact:

Re: Just a theory Antennas

Post by theEarwigger » 15 May 2016, 14:56

A practical "thicker elements" antenna is here:
http://www.tc2m.info/TC2M%20HF%20Vertical%20G8JNJ.pdf

Post Reply

Who is online

Users browsing this forum: No registered users and 3 guests