Discone versus Amateur white stick..

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phillmobile
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Re: Discone versus Amateur white stick..

Postby phillmobile » 24 Apr 2013, 14:25

Dagnabbit wrote:I thought I read somewhere once that a discone is horizontally polarised (i.e. from the disc rather than the cone) so that might account for dramatic differences?


Yes i too beleive they are horizontally polarised

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Re: Discone versus Amateur white stick..

Postby Monsta » 24 Apr 2013, 16:56

troffasky wrote:
Monsta wrote:Lets do some Math!

Let's do some Reading!:
troffasky wrote:improvising radomes for outdoor wifi stuff was...stick it in a microwave oven

I've highlighted the key word, now after reading it again, do you still think I was suggesting putting an antenna in the microwave? Or is there possibly a different, more plausible, explanation?



:shock:
hmmm...okay
so you are suggesting putting one of THESE in a Microwave? ...now it makes sense!
sorry to have doubted you brother ...

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Re: Discone versus Amateur white stick..

Postby troffasky » 24 Apr 2013, 20:26

Woosh.

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Re: Discone versus Amateur white stick..

Postby crusty » 24 Apr 2013, 21:38

Troffasky is talking about testing suitable materials (eg black tape, read back a page Monsta) for wrapping an antenna with.
And troffasky, few materials will not warm in a microwave, though I get your point. If it sparks, its a non starter. :D

And no, Discones are not horizontally polarised.

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Re: Discone versus Amateur white stick..

Postby g7kxm » 24 Apr 2013, 22:02

phillmobile wrote:
Dagnabbit wrote:I thought I read somewhere once that a discone is horizontally polarised (i.e. from the disc rather than the cone) so that might account for dramatic differences?


Yes i too beleive they are horizontally polarised


I'm sure i've read in the "bible", Radio Communications Handbook (published by RSGB) that the discone is vertically polarised, I haven't got it to hand but I do have the book "International Antenna Collection" with me and it has a design project for the discone which starts:

"The discone is a vertically polarised broadband aerial which exhibits a VSWR of 1.5:1 or better over a wide range of frequencies."

If my memory is right (which I often doubt) the discone is a bicone dipole with the top cone flattened to increase bandwidth therefore if mounted in its usual manner i.e. driven element (disc horizontal) and the counterpoise (cone/wires) pointing down at an angle it is the same as a vertically polarised dipole.... but I have been known to be wrong :-)
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Re: Discone versus Amateur white stick..

Postby Andy » 17 May 2013, 13:48

I'd agree with that, Andy. The two 'elements' (the disc and the cone) are stacked vertically so the polarisation will be predominantly vertical, although I suspect the polarisation is less 'clean' than a simple dipole.
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Re: Discone versus Amateur white stick..

Postby bigpimp347 » 17 May 2013, 20:12

it depends on the discone, some only have horizontal elements and diagonal ground radials,
then there's the ones with the vertical top element that you can TX on..

the majority you seem to buy have the vertical top element, but also the horizontal elements (the disc) are also part of the radiator.
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Re: Discone versus Amateur white stick..

Postby EddieP » 30 Jun 2013, 19:23

As this is aimed at us newbies, can someone give some model numbers of suitable white sticks to look into please. I'm not sure what constitutes an amateur white stick, but a model number or 2 that are proven to work well will be a good starting point for research.

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Re: Discone versus Amateur white stick..

Postby JGR » 30 Jun 2013, 19:42

Well you have a choice such as the SHARMAN'S V-2000 covers 50Mhz to 500Mhz approximately and if you wish to take it higher than this say into the 1200Mhz range then a few antennas offer a 146 to 1200MHz. There are many others but the Sharmans offer a better priced product even though they are copies of other major manufactures. Sorry for not listing a whole list of antennas but there is far too many versions to list here, so I Hope that this helps you get an idea of what it is your searching for.
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Re: Discone versus Amateur white stick..

Postby bigtee » 23 Jul 2013, 08:36

Using the Watson W-30 it knocks spots off a discone i use it for all my scanning needs either air band 120 mhz marine 156 mhz or pmr 450+ mhz it will tx just fine out of the amateur band at around 446 i use low power.

The key is height and no surrounding buildings for optimum range mine is outside 40ft up in the air it would work from the loft.

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Re: Discone versus Amateur white stick..

Postby bear » 10 Aug 2013, 08:53

I have just purchased a Sharman X-30, and I am delighted with it so far.
Thank you to all of those giving their views on it. To us relative newcomers to scanning, you are most helpful.
So...to anyone else who was in my position and maybe clueless on which antenna to buy, go for the X-30, I don't think you will regret it

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Re: Discone versus Amateur white stick..

Postby bigbassman » 09 Oct 2013, 17:36

I'm using an X30 for receiving only,and I'm wondering how important it is to have the 3 radials installed?I'm using it with a scanner,and it would be much easier to install it where I want if it didn't have the radials attached.Would this affect performance?I'm thinking not,but I would appreciate some opinions.Thanx
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Re: Discone versus Amateur white stick..

Postby Volvo » 02 Dec 2013, 10:59

Hi I have just read with interest the pros and cons,discone verses white stick.I am in the same prodick
PSR295 SBS1er Auroa ssx Bct15x

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Re: Discone versus Amateur white stick..

Postby Volvo » 02 Dec 2013, 11:12

Hi I have just read with interest the pros and cons,discone verses white stick.I am in the same position. I have a BCT15x and was un sure which antenna to use, having read your reports I think I will go with the stick. I will let you now how I get on
Pete
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Re: Discone versus Amateur white stick..

Postby Gemini4 » 05 Dec 2013, 13:09

To be honest, i just hope my white stick holds up in these gales :( on another note i've been listening and broadcasting on my white stick and have to admit
i was sure i picked up more with the discone?


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