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 DEWD UR0GT?

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karelgol
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Senior contributor
karelgol


Call Sign : 19-CT-024 / PD0GOL
Posts : 140
Times Thanked : 6
Join date : 2020-05-21
QTH or Location : Steenwijk, JO32bs
Equipment Used : Dynascan AT5555,Yaesu FT-897, W3EDP junior, MFJ-925
Age : 65

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PostSubject: DEWD UR0GT?   DEWD UR0GT? Icon_minitimeSun Oct 25, 2020 3:32 pm

In another thread i advised building a DEWD because i have modelled one in CocoaNEC and it gives (in theory) an SWR of 1.1:1 between 26.5 and 28.5 Mhz. I find that almost to good to be true, so my question is there anyone who used this antenna and can confirm that theory is right in practice? Before i start building me one?

73
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Victor
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Victor


Call Sign : 26-CT-3228 / M7VIC
Posts : 5803
Times Thanked : 352
Join date : 2019-11-10
QTH or Location : Bedford
Equipment Used : Various

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PostSubject: Re: DEWD UR0GT?   DEWD UR0GT? Icon_minitimeMon Oct 26, 2020 6:07 am

Hi Karel,

That's probably part of the 'fun' of antenna experimentation, modelling AND building.

I always remember with antennas that 'you don't get something for nothing' so would expect a DEWD to be a little bit down compared to a standard dipole.

Had a similar issue when reading up on terminated antennas, lots of theory, lots of modelling and when I did find those that had actually built them, quite conflicting results. In the end I had to physically build them myself to see the results first hand.
Indeed they are as wide-banded as modelled, (SWR of 2:1 or less across the whole HF band!), but they stink in terms of performance compared to my fan dipole array.
(Built a T2FD, a triple, a terminated loop and a Bonnie Crystal terminated butterfly).

Was it a waste of time? Depends on how you view it, I actually had fun building them and gained hands on experience.

So much so that I modified my dipole array to include zig-zag dipoles for 80m and 10/11m. With a matcher I can bring the low impedance up and now get all the bands of interest for me and much better so than a terminated affair. I can even squeeze a little 160m performance with the matcher and although not perfect, still gives me top band operation. Better than none at all Wink


They say every antenna is a compromise, it's just a case of finding a compromise that fits your needs.

If a modelled antenna looks promising then maybe build one and see for yourself. If you're waiting for someone else to build one you could find yourself with a long wait and like me obtain conflicting results.

Enjoy your experiments.


All the best,
Victor
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karelgol
Senior contributor
Senior contributor
karelgol


Call Sign : 19-CT-024 / PD0GOL
Posts : 140
Times Thanked : 6
Join date : 2020-05-21
QTH or Location : Steenwijk, JO32bs
Equipment Used : Dynascan AT5555,Yaesu FT-897, W3EDP junior, MFJ-925
Age : 65

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PostSubject: Re: DEWD UR0GT?   DEWD UR0GT? Icon_minitimeTue Oct 27, 2020 4:54 pm

It wasn't so much about a waste of time, but about a waste of good aluminum Wink 
And being almost not electronically but mechanically educated i try to keep the antenna as simple as possible. Thanks for commenting.

73
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Victor
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Victor


Call Sign : 26-CT-3228 / M7VIC
Posts : 5803
Times Thanked : 352
Join date : 2019-11-10
QTH or Location : Bedford
Equipment Used : Various

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PostSubject: Re: DEWD UR0GT?   DEWD UR0GT? Icon_minitimeTue Oct 27, 2020 5:30 pm

No worries Karel, it was in the spirit of offering help.

Have fun with your antenna work.

73
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https://www.qrz.com/db/M7VIC
karelgol
Senior contributor
Senior contributor
karelgol


Call Sign : 19-CT-024 / PD0GOL
Posts : 140
Times Thanked : 6
Join date : 2020-05-21
QTH or Location : Steenwijk, JO32bs
Equipment Used : Dynascan AT5555,Yaesu FT-897, W3EDP junior, MFJ-925
Age : 65

DEWD UR0GT? Empty
PostSubject: Re: DEWD UR0GT?   DEWD UR0GT? Icon_minitimeThu Oct 29, 2020 12:52 pm

So, tried another design. I'd describe that as a short(20cm) boom 2 element Yagi. 2Dbi extra max gain compared to the DEWD. SWR <1.1 between 27 and 28.5Mhz. Below 2 up to 29.5Mhz. And still simple to build. Thanks Victor for getting me thinking.

73
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