20m Twins - Phased Vertical Setup & Operation

I had a small daytime window to once again setup 20m phased 1/4 wave verticals in my garden. These are spaced 1/8th wavelength apart (2.5m)
The phase/feed lines are 157 degrees
The Delay line is 39 degrees
This system is based on a design from the ON4UN Low Band DXing book. I still need to purchase this book myself.
Please also check out Justin's KG2RG UA-cam channel.
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Any questions, please leave them in the comments below.

[@mewintle]

Perfect. Thank you for the detailed explanation of the antenna parts, then the nice shack and then a great real-world demo, then a wonderful wrap-up. All with frank discussion that didn’t just gloss over the unpredictability and need for patience. Just perfect!

[@MM0OPXFieldRadio]

Your welcome. if your going to do this, plan for months of optimisation and on air testing. Look up KG2RG, Justin got his working a treat.

[@ewankennedy6663]

Thanks Colin, really interesting. Looking forward to the Portable Moxon videos, I have been thinking about the same.
73’s de GM0VMV

[@vincenzofidanza2539]

Hello Colin, in my opinion the simplest way to have a phased vertical array is to use a half square antenna antenna (+3db) that if you double it you can have a Bob Tail Curtain.
for even more gain. Feeding the half wave with a 1:49 balun on one hand you can also have multiband operation

[@MM0OPXFieldRadio]

Agreed but you can swich it which is nice. Have the seen my later video which talks about a half square. If not check it out.

[@vincenzofidanza2539]

@@MM0OPXFieldRadio
Yes I have it, nice presentation too

[@karlwalker9700]

Another good video pal,interested to know how you’ve made those boxes and clamped them to the poles?Cheers
Karl G0SKW

[@SteveH-TN]

Thanks for sharing this video and information
73 Steve AA4SH

[@MM0OPXFieldRadio]

I will hopefully be setting these up soon again.

[@mikes6844]

No apologies needed, radio waves don't necessarily behave at the time you want them too. Multi path behaves strangely and I would think the front to back takes effect when a greater distance is involved. I'd be interested in adopting a couple of raised tuned radials as to whether they aid directivity. Well done Colin this is another masterful vid produced from the heart - 73 Mike

[@GM6DX]

When your near a CW signal Colin just hit the Auto Tune button below the LED to the left of the main dial. It will zap the VFO right to that CW signal

[@MM0OPXFieldRadio]

I did do that off video. Need to change sidetone as I just prefer it lower in pitch.

[@ianmono51]

I've been thinking about a similar system to experiment with. This one looks really well put together. Have you considered adding to more poles for more direction?

[@MM0OPXFieldRadio]

Thanks, it is and willl handle high power no problem. Yes I've thought about a 3 or 4 element but yet to see a design for one. Different phasing and delay lines will be required.

[@billgatewood9578]

Great video. Thanks for doing it. Is it possible to phase 2 dual band antennas. I would like 40 and 20.

[@MM0OPXFieldRadio]

Possibly. But maybe not in the sense you think. You still need 2 complete phasing systems. You could have 2 fan verticals each with 20m and 40m elements. The 40m would be 1/8th spacing which makes the 20m 1/4 wave spacing. I think the tuning would be an absolute pig but do think it's worth trying. I may make a video talking about the possibility if this.

[@PatAutrey]

Is the length of the coax from the radio to your delay critical? What length is yours and doesn't make a difference in the way this antenna operates

[@MM0OPXFieldRadio]

The coax from the box to the radio is irrelevant. What's critical is the delay line and the phasing line lengths.

[@PatAutrey]

@@MM0OPXFieldRadio thank you for getting back to me this really helps a lot!