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UHF ariel 

 

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 Post subject: UHF ariel
Posted: Fri Nov 19, 2004 12:38 pm 
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yesi need one got me a nice little 4watt cb and now need ariel any one

 

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Posted: Fri Nov 19, 2004 12:40 pm 
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is it AM or UHF

Where do u plan to mount the antenna

Do yo plan to use it for long distance country comms, or short(ish) distance work in built up areas?

 

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Posted: Fri Nov 19, 2004 12:42 pm 
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Do UHF systems work on a ground plane? i.e. does the position of the aerial dictate the directionality of the singal?

 

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Posted: Fri Nov 19, 2004 12:53 pm 
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4.9 EF Futura wrote:
Do UHF systems work on a ground plane? i.e. does the position of the aerial dictate the directionality of the singal?


Yeah they do indeed work on a ground plane, UHF has similar principals to AM, just a different wavelength.

You can get ground independant antennae for UHF if there isnt a reliable groundplane available.

 

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Posted: Fri Nov 19, 2004 12:59 pm 
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basically want a nice smallish areill to mount on glass if possible but i was told needs to be earthed to the car body?

mainly used for cruises through perth etc and the country side
not long distance so i big f**k off ute one is not needed

 

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Posted: Fri Nov 19, 2004 1:06 pm 
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Is it UHF or AM ?

If its UHF you have a few options

AP454-70-5G: 3.0dB Glass Mount Stainless Steel Colinear Whip (470-490Mhz)

AP454-3G: Unity Gain Glass Mount II, Stainless Steel Whip (406-520 Mhz)

They are around $160ea.

There are no on-glass options that im aware of for 27Mhz

 

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Posted: Fri Nov 19, 2004 1:09 pm 
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yer uhf
uniden 510..

sorry i mean i would like a glass mount ie simalar to the mobile phone style

f**k $160! sheesh

 

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Posted: Fri Nov 19, 2004 1:18 pm 
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Ok cool.

Yeh, $160.

You're looking at $110 for PhasemasterII Elevated Feed antennae (These are the ones which you see mounted in the bonnet and boot grooves)
They provide 6dB gain

 

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Posted: Fri Nov 19, 2004 1:29 pm 
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damn $110 hey
got any links to online shops so i can havea looksee and what do u mean by 6db gain?

 

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Posted: Fri Nov 19, 2004 2:24 pm 
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Gain is a measurement of the beamwidth concentration.

Higher gain gives better performance for long distance in flat areas, or high elevation transmission stations

Lower gain gives better performance around the city.,

6dB is a good all-rounder. Possibly a little too narrow for heavy CBD use, but the Perth CBD is pretty much like rural NSW anyway :P

www.rfindustries.com.au / www.tenfour.net.au

 

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Posted: Fri Nov 19, 2004 2:31 pm 
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Disco Frank wrote:
damn $110 hey
got any links to online shops so i can havea looksee and what do u mean by 6db gain?


Gain is a measure of amplification (sort of). In the case of comms equipment, it relates to the relationship between the wavelength of the frequency and the length (effective or otherwise) of the antenna.

Example (using 27MHz as i know s**t all about 477Mhz UHF):

I had a 27MHz AM CB. The wavelength of this frequency is roughly 11 meters. Power was 4watts.

Therefore, an 11 metre antenna would produce 1db of gain. A 22 metre antenna would provide 2db of gain and effectively 8 watts of output. I had a 5.5 meter antenna (which would have procuded 0.5db of gain) but had a 2.25 meter loading coil so was effectively 7.75 mteres long and produced 0.75db gain or 3 watts of output.

477Mhz is an ultra high frequency and therefore has a short wavelength. So a 'normal' sized UHF antenna will produce a s**t of gain. 6db on your 4watt unit would effectively be 24 watts of output.

Also affected by the size of the ground plane..... my old 27Mhz setup was ground independant so wasnt an issue.........complicated :lol:

Next week's lesson: Tuning antennae and using the standing wave ratio, lol. Class dismissed.

 

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Posted: Fri Nov 19, 2004 2:33 pm 
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Be careful when listening to claims of gain, just having 6db gain doesnt say gain over what, if it said 6dbd, you would know it has gain over a dipole, complex stuff. You can but on glass ones on ebay, for 25 bucks or so.
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Posted: Fri Nov 19, 2004 3:02 pm 
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Hey Neil i didnt know u were abrtw!!!!

 

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Posted: Fri Nov 19, 2004 3:15 pm 
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Waggin wrote:
but the Perth CBD is pretty much like rural NSW anyway :P


thems fightin words!! :P

 

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Posted: Fri Nov 19, 2004 3:36 pm 
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bowsaw wrote:
Be careful when listening to claims of gain, just having 6db gain doesnt say gain over what, if it said 6dbd, you would know it has gain over a dipole, complex stuff. You can but on glass ones on ebay, for 25 bucks or so.


This is very true. RFi put all their gain's over a 'Quater wave roof mounted antenna'

 

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