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TESTING MY HF DOUBLET ANTENNA

Richard Newstead

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In an earlier video I showed how to make a doublet antenna that would cover all the amateur radio bands 80-10m. In this video I take it out in the field to test it.
If you enjoyed this video please consider subscribing (and hitting the notifications option). It actually helps me to promote the videos. Future topics will include a mix of ham radio portable and more general (but related) subjects. I also have a range of SOTABEAMS and Radio Adventures merchandise that you might like to look at. It’s here: www.sotabeams....
SOTABEAMS stocks a wide range of items for the serious portable operator. www.sotabeams.c...

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7 сен 2024

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Комментарии : 69

@wolfgangpalme3709 Год назад

Hi Richard, I always enjoy your well made videos on HAM radio gear and the more on your outdoor radio activities. It' always a big pleasure watching them. Keep up the outstanding work. Wolfgang, dl8abh

@G1WHP 4 года назад

Cheers Richard. I like a simple wire antenna. 👍🇬🇧👍

@g3cwi_Radio_Adventures 4 года назад

Hard to beat a properly designed antenna.

@de_w8tam 4 года назад

I use 300 ohm TV antenna twin lead It's very light weight, and doesn't even strain my Carbon-6 at full extension. Great video, I love operating 80m portable. Glad you had such good success! 73 de w8tam

@g3cwi_Radio_Adventures 4 года назад

Thanks. I suspect TV twin lead is getting hard to find these days.

@hcy0 4 года назад

@@g3cwi_Radio_Adventures DX-Wire has it.

@marklowe7431 3 года назад

I'm still amazed that you can throw up a wire antenna, low power and work this well. Incredible.

@g3cwi_Radio_Adventures 3 года назад

Radio is indeed rather wonderful!

@barrykery1175 3 года назад

Parallel feeders, the best way to go if one can use them. Nice portable setup. Barry, KU3X

@vaamorais 2 года назад

Very interesting setup you have there. It looks really small and portable. Amazed at the distances you are able to reach. I found this video and the part 1 very useful as I am studying for my Amateur Radio foundation license and I find the antennas topic Moore difficult to fully understand. Thanks for sharing

@rodneystevens741 4 года назад

Hi again Richard Thanks for posting your review on the doublet. I did view your construction post so was waiting for you to review it. Seemed to work well and another good portable antenna. You certainly do keep busy and as always enjoy watching your channel. Cheers 73 Rodney VK7HAM

@g3cwi_Radio_Adventures 4 года назад

Thanks. I like to get out in the field with radio!

@m_a_s6069 Год назад

It always looks so damp and wet where Richard sets up, I'm surprised he doesn't use a pen more suited for damp areas. Great video, though!

@markhamradio4595 4 года назад

Good results Richard. Well worth the wait from your initial construction video .It really does prove what can be achieved with a simple antenna!!

@g3cwi_Radio_Adventures 4 года назад

Thanks!

@madcarew.3256 4 года назад

preaching to the converted...built it from yr website over a year ago...mfj auto/man.matcher to 817nd...exellent tx/rx..spoils me for choice on mobile..it always gets packed 1st..followed by my experimental bits of wire!!! Thanks 73

@g3cwi_Radio_Adventures 4 года назад

Thanks. Doublets are often a good choice.

@graywolf1911 4 года назад

Good job Richard, the antenna is simple to make and your demo proves it works well. It would have been nice if you had a more distant contact, but, it was daytime on the lower bands.

@g3cwi_Radio_Adventures 4 года назад

Thanks Richard. Working a DX station is not a very good indicator of antenna performance. It’s a bit more complicated! It works pretty well. Good results into the USA yesterday.

@graywolf1911 4 года назад

@@g3cwi_Radio_Adventures Into the USA, that is great Richard !! I hope you are staying safe my friend !!! God Bless !

@Hogdriver88 4 года назад

Thanks for posting part 2. I'm in luck - I have a 4:1 balun in stock - now to order up some wire and spreaders and get to work

@g3cwi_Radio_Adventures 4 года назад

Sounds like you are all set.

@pmsecretary52 4 года назад

WELL done Mate...Another great video though I had no doubt your Ant would not work. All your products are top notch.

@g3cwi_Radio_Adventures 4 года назад

Cheers. I used it again this week on 80m SSB. It's a cracking antenna!

@lovethevdub 4 года назад

Thanks for another great video Richard. Someday I'd love to visit and do a summit with you. 73 de WU7H

@g3cwi_Radio_Adventures 4 года назад

Let's wait until the world returns to normal!

@richardayely4636 3 года назад

Have seen many comments that a 1:4 balun is not necessary when feeding open line and a 1:1 balance to unbalance type gives a better match and transfer of power on the bands above the 40 meters. It may also make it possible for the K3 atu to operate. Ever considered trying this configuration? 73 Rick G6AKG

@g3cwi_Radio_Adventures 3 года назад

Worth a try. The 4:1 transformer does help getting a match in some cases.

@jorgelopezcanales4347 2 года назад

😊 buen a prueba con tu antenna !!

@forthy62 4 года назад

Great video again Richard. I always thought that the KX2 built in tuner could tune nearly everything. Did you made a comparison between the external (Elecraft T1?) and the internal. A doublet seems to be a really great antennena for portable operation. 73, Stephan, DF6PA

@g3cwi_Radio_Adventures 4 года назад

I did not make the direct comparison. I think the external tuner I used has more discrete lumped elements so it should give better matching. Maybe I will do a video comparison of the T1, the KX2 and the mAT tuner. That might be interesting.

@RobertVinet 4 года назад

@@g3cwi_Radio_Adventures Would love to see a review of portable antenna tuners for field work, discussion of auto vs manual such as the Emtech ZM-2. Enjoying your videos. 73, Robert, VE9CDN

@gsansoucie 4 года назад

Wow to the “using this external tuner as it has a better range than the KX2 ATU” first time I’ve heard that. What is that external tuner?

@MrJkubinski 2 года назад

Love the idea...been off the air for a few months when moving to a new home. Looking for new antenna ideas and this is interesting to me. Question...how do I 'know' the impedance of an antenna so that I can determine what kind of balun or unun that I will need? It is as simple as plugging it in to my analyzer and seeing what it is, and then determine what ratio balun or unun to create? Thanks. 73 de KD8YQX

@g3cwi_Radio_Adventures 2 года назад

The impedance of the antenna will vary across the frequency range. Don’t worry about it too much!

@YachtMovers 4 года назад

Great test. Thanks for doing 'the other half'.... Now I need to create the transformer and ATU!! - What is that small ATU you are using?

@g3cwi_Radio_Adventures 4 года назад

My pleasure - sorry that it took so long to do. The ATU is an MAT-10. Nice but a bit expensive for what it is perhaps.

@YachtMovers 4 года назад

@@g3cwi_Radio_Adventures Ah. Thanks. I was planning to use the MFJ Travel Tuner as it has a Power/SWR indicator, and can connect directly to the ladder line...

@blomidon 4 года назад

Great demo of the antenna. I plan to get some spacers from you and build this antenna when I can get outside again and the snow has gone. Does it need a balance and if so you sell them.? BTW I can never understand how some SOTA sites can be so flat.

@g3cwi_Radio_Adventures 4 года назад

Glad you enjoyed the video. Did you mean a balanced ATU? We dont sell them - sorry.

@blomidon 4 года назад

Richard Newstead It self corrected from balun to balance. Since then I remembered I have a LDG 1:1 balun. I’ll be ordering the rest of the parts from you guys. Thanks.

@barbsblogs1563 2 года назад

Hi Richard am I understand this correctly you’ve got the ladder line connected to a 4-1 Balum then a short bit of coax to a 1-1 unbalanced to unbalanced unun? Then on to an atu ?

@g3cwi_Radio_Adventures 2 года назад

Antenna==4:1 transformer==1:1 balun==amu==radio

@elwood.downey 4 года назад

Nice deployment, worth especially if staying a little while. Would mention that some twists in ladder line could actually help cancel radiation from any slight imbalance of current. 73

@g3cwi_Radio_Adventures 4 года назад

Thanks for the suggestion on the line. Do you have any reference that shows how that works?

@elwood.downey 4 года назад

@@g3cwi_Radio_Adventures In reviewing references I think I am wrong. It seems twisted pairs only reduce EMI in balanced configurations, not unbalanced. So, some twisting might still be helpful but not for the case I mentioned. Wikipedia has as good a summary as any at en.wikipedia.org/wiki/Twisted_pair .

@elwood.downey 4 года назад

One more swing at this dead horse: you might also want to keep the line a few spacings above the ground. Draping over weeds or grass should be enough, as you might already be doing. The idea being that although the electric field is pretty much confined to the plane containing the two wires, the magnetic field will be cylindrical centered along each wire. So it will attenuate if it encounters anything lossy, such as earth. It falls as 1/r^3 so a foot or two is plenty. Other than classic E&M texts, can't locate a reference for this off hand.

@wa9vfd841 4 года назад

I want that hoodie in that color and if I can't get it I'm likely to complain being an American and all.

@g3cwi_Radio_Adventures 3 года назад

The colour (color) is gold. Not great for stealth radio!

@vaamorais 2 года назад

Hi Richard. Revisited this video as I wanted to ask you where can I purchase a similar antenna? Foundation does not permit us to build antennas I trust. On a summit what antenna would you recommend? Thanks.

@g3cwi_Radio_Adventures 2 года назад

Hi Vitor. I can't help you with where to buy a doublet - sorry. With regard to antennas on summits, that's a complex subject but a dipole is a great start!

@vaamorais 2 года назад

@@g3cwi_Radio_Adventures Thanks Richard for coming back.

@nvrumi 4 года назад

Is that an Elecraft T1 tuner? I thought you were going to tell us what tuner you're using, but I can't find it anywhere.

@g3cwi_Radio_Adventures 4 года назад

It’s an mAT 10 tuner

@CraigPerry 4 года назад

Why a 4:1 balun? My understanding is that tuners work best with high impedance loads?

@g3cwi_Radio_Adventures 4 года назад

Different tuner configurations work best with different impedance transformations.

@mumi009 4 года назад

Would 450 ohm window line be adequate? Any particular length?

@g3cwi_Radio_Adventures 3 года назад

Yes that would work too. Not sure what length would be best but any length will work on most bands I suspect.

@hcy0 4 года назад

80m on 10w SSB during the day? Great! 73

@g3cwi_Radio_Adventures 4 года назад

Works really well!

@forgetyourlife Год назад

D-layer be damned @@g3cwi_Radio_Adventures

@karlD1963 4 года назад

What's the device on your wrist, Richard?

@g3cwi_Radio_Adventures 4 года назад

Remote controller for the camera

@LBJ-bj 2 года назад

赞赞赞o(≧v≦)o~~好棒o(≧v≦)o~~好棒o(≧v≦)o~~好棒，great

@superconductorchip9072 4 года назад

Did it test Positive ?..

@g3cwi_Radio_Adventures 4 года назад

I suppose with enough power I might get a corona discharge.

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