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time machine

time machine

Posts : 6
Reputation : 1
Join date : 2019-06-28
QTH or Location : Wales
Call Sign : MW6OXV
Equipment Used : FTDX1200

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PostSubject: multi band antenna   multi band antenna Icon_minitimeSun Jun 30, 2019 10:44 pm

Made myself a multi wire horizontal multi band antenna over a year ago for 20,17,15,11 and 10 metres but unable to add on the same for 40m for lack of space (small garden). Any simple efficient ideas that would not involve an external atu will be greatly appreciated.
Steve.
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Radio Pixie

Radio Pixie

Posts : 14
Reputation : 0
Join date : 2019-06-27
QTH or Location : Peoples Republic of Cornwall
Call Sign : 26CT052

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PostSubject: Re: multi band antenna   multi band antenna Icon_minitimeSun Jun 30, 2019 10:57 pm

If you can't fit a horizontal antenna in for 40m band, how about vertically? Vertical 1/4w on 40m is just over 10 metres in length. You can run a wire along a ground mounted fibreglass pole, and connect the braid of the coax to an earthing rod, and even have a few 10 metre long ground wires if you can get away with that.

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Toobad

Toobad

Posts : 15
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Join date : 2019-06-27
QTH or Location : Hereford
Call Sign : 26CT3000/G0NMC
Equipment Used : Yaesu FT-DX3000, Heil PR40, Imax 2000, 80m Delta Loop, GAP Titan

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PostSubject: Re: multi band antenna   multi band antenna Icon_minitimeMon Jul 01, 2019 12:35 pm

I've always been a great advocate of the "suck it and see" approach. Just get around 33ft. of wire up in the air either side of the feedpoint with all the turns and slopes required to fit on your property. You should be able to get it to resonate and how it decides to radiate will dictate whether it is a keeper or not.

I am blessed with a 2 acre plot and once decided to throw up a 2 wavelength horizontal loop for Top Band, some 1050ft. of wire. It tuned up fine but was as deaf as a post! Later I cut it back to make an Extended Double Zepp for 80m. My dedicated 80m dipole still beat it by half an S-point but now when I tuned it for Top Band it put out an absolutely redonkulous signal to the point where contesters would come over to use it for Top Band contests. Go figure! scratch confused
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erik

erik

Posts : 8
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Join date : 2019-06-27
Age : 53
QTH or Location : HOUWAART - JO20kw - BELGIUM
Call Sign : ON2OY - 16CT004
Equipment Used : TS590S on HF / JFK II on 27MHz

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PostSubject: Re: multi band antenna   multi band antenna Icon_minitimeMon Jul 01, 2019 3:58 pm

try to google 'hyendfed antenna', its a company in The Netherlands that makes multiband wire antennas, maybe that can be a solution for you, these are not cheap but quality made.
Or a half size G5RV with one arm as a vertical (taped to a fishing rod), the other arm 50 cm over the ground horizontally, but you will need a tuner to get the other bands.
A quarter wave vertical with some radials on the ground will work well.
From my location if I want to work Spain on 40m I get better results with my 1/4 vertical than with my FD4 running north to south.
the 'suck it and see' approach, like mr Toobad says is the way to go.
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Radio Pixie

Radio Pixie

Posts : 14
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Join date : 2019-06-27
QTH or Location : Peoples Republic of Cornwall
Call Sign : 26CT052

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PostSubject: Re: multi band antenna   multi band antenna Icon_minitimeMon Jul 01, 2019 5:31 pm

As well as Hyendfed antennas, there is the G-whip Resonant 421 that is about 12 metres in length.

https://www.gwhip.co.uk/421-triband-antenna
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time machine

time machine

Posts : 6
Reputation : 1
Join date : 2019-06-28
QTH or Location : Wales
Call Sign : MW6OXV
Equipment Used : FTDX1200

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PostSubject: Re: multi band antenna   multi band antenna Icon_minitimeTue Jul 02, 2019 12:34 pm

Thanks for all the replies. A vertical antenna (especially this size ) is definitely out. The wind situation around here can be extremely bad at times as I am completely open to the west south/west and in general this is where the direction is usually from . I'm over 150m asl (over 500ft approx.) and even a vertical for 10m is not likely to last too long believe me I've tried! It is a very difficult garden to work with on size but I will experiment with an 'L' shaped horizontal which is going to be the only way. I can't climb up ladders (epilepsy) so it makes erecting antennas more difficult than usual. Come to think of it the idea I have will be more of a slight 'C' shape but where I am going to connect the wire to is not going to be easy. I would rather not use an external atu if possible (price really) as I have managed so far with only having to use the internal atu for 10m and mid band slightly on 11m.
Anyway, again thanks for your relies,
Steve.
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The Old Hobbit

The Old Hobbit

Posts : 5
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Join date : 2019-08-10
QTH or Location : Aldershot
Call Sign : M6 KVK
Equipment Used : Mil manpack PRC320, FT 450D, FT 817ND, FT8800, Varity of HT,s

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PostSubject: Re: multi band antenna   multi band antenna Icon_minitimeSun Aug 11, 2019 8:22 am

I know a fella who also struggled for a 40mtr antenna and came up with a "W" shaped wire, it worked a treat. The center being the middle of the "W" on a pole and he fed the wire out to insulators attached to his soffit and then back out to two more poles. Yes it was compromised a little but his radio tuned it up and he manages some good contacts.
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