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SW Antennas
Topic Started: Wednesday, 6. January 2010, 20:00 (841 Views)
Firetrap
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26CT100

As you all know i need at ATU for the kenwood, however..

If i were to make a dipole antenna for the 20m band would i still need a tuner before i could TX on 14Mhz

If this is possible can someone tell me the correct length or the optimum length for each side of the dipole.

maybe even something like this

http://www.qsl.net/5b4agv/5b4agv_odmd20-10m.html

or to be lazy would i be able to use this?

http://www.thunderpole.co.uk/am_pro.html

Thanks very much!

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Mark in Essex
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26 Charlie Tango 037

http://www.kwarc.org/ant-calc.html
There you go Lee
[][img][/img][/url]

https://www.youtube.com/user/26TANGOMIKE037/videos



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Firetrap
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26CT100

Sweet!

Ill bookmark that page! What is the calling freq on 20m?

Think that would be best freq to go on

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Mark in Essex
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26 Charlie Tango 037

Forget the verticals and make your own using the choc block method .... or buy a few dipole centers (very cheap) and use the Calculator i posted above
[][img][/img][/url]

https://www.youtube.com/user/26TANGOMIKE037/videos



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Mark in Essex
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26 Charlie Tango 037


14,125-14,300 2.7 kHz All modes - SSB contest preferred segment
14,195+- 5 kHz Priority for Dxpeditions
14,230 kHz Image Centre of Activity.
14,285 kHz QRP Centre of Activity
[][img][/img][/url]

https://www.youtube.com/user/26TANGOMIKE037/videos



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VoG
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Firetrap
Jan 6 2010, 09:00 PM
a dipole antenna for the 20m band would i still need a tuner before i could TX on 14Mhz

To answer your original question Lee... You'll need a tuner for ANY antenna to be able to usefully cover more than one band, unless it has Traps and so forth so you can change the bands on the antenna. And who wants to go out and adjust traps when it's freezing, snowing or hissing down with rain just because ytou want to move from 27MHz to 20MHz.

Yes, you could make a resonant wire antenna / dipole suitable for 20m, but it would ONLY do 20m.

I'd leave the Mobile twigs well alone - personally - much better results with a G5RV / Dipole. :)
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Offplanet
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26 Charlie Tango 104

Most Ham stations (and many 11m Dx stations) run horizontally polarised aerials (horizontal beams, wires and dipoles), so a vertical mobile antenna would be extra poor, as this would be vertically polarised and you'd lose 20db of signal straight away (over 3 S-points).

Sometimes the polarisation of a signal can be changed when it bounces off the atmosphere, but generally a vertical antenna will talk better to another vertical and a horizontal to another horizontal. This is why a horizontal 27Mhz dipole will be 10-1 to the groundwave CB'ers using verticals, but talk great to another station 1000's of miles away on the skip. Something like an "Inverted V" type antenna is an easy, cheap compromise as it's a half-way house between horizontal and vertical (just a basic dipole in an upside down V shape).

An antenna the correct length, resonant for the frequency in question, will always perform better than one designed for another frequency and tuned down with an ATU (which is primarily a transmatch device to lower the SWR on a non-resonant antenna to allow transmission). With a good long wire attached though, the ATU will make for a good compromise alternative to having multiple aerials. What an ATU will not do, is make a poor antenna into a good one, and not make a horizontal talk better to a vertical and vice-versa.

A tidy set-up would be to have a decent vertical like a Silver Rod or 827 for groundwave and vertical to vertical polarised comms, and possibly a couple of resonant horizontal dipole aerials or a long wire/ATU combination.

The least effective option would be a vertical mobile antenna tuned to all sorts of bands with an ATU - SWR would look good, but you wouldn't hear much!

Cheers
Gary
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