W8TJM

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@Orthodoxuk Ай бұрын

The Black Widow today is carbon fibre, was this not an issue if yours were, as carbon fibre absorbs RF? You also mentioned glass fibre so maybe yours were made of that?

@W8TJM Ай бұрын

All the Black Widow rods I have seen are fiberglass. If I see any carbon fibers ones, I might order a set to evaluate. Just checked Cabelas and they are still fiberglass.

@Orthodoxuk Ай бұрын

@@W8TJM I've ordered a different set of fibreglass ones, so will be building soon. Thanks for the response.

@obrienaj Ай бұрын

I am sorry but I have no clue how the building goes when it comes to the fishing rods . Is there a specific shape/angle that we have to bend the rods in to ?

@W8TJM Ай бұрын

The shape is not very critical. Make the wire harness and attach the wires to the poles or rods you are using with black electrical tap. Tie wrap or tape securely at the point where they leave the rod and head for the insulator strip. Once it is all secured, it will have its own shape. I have built them with various fishing rods now that bend differently and they all perform the same. Have fun and don't fret the angle too much!

@zs1ml-mariuslubbe505 2 ай бұрын

What is the max power usable on this antenna. Great job though, looks very professional. I will be looking at building a 20m version.

@W8TJM 2 ай бұрын

I have run 1200 watts through it, but normally run about 800 watts. It has a decent VSWR so voltage breakdown is not an issue.

@Petersg1964 3 ай бұрын

Hi there, i have a normal moxon but wanted to use it for local tx, but as moxon has a different polarization as the local Rx stations I thought to put the antenna upright. Now I'm note sure how to aim the antenna (regular middle feedpoint, as you mention in your video). Would appreciate your thoughts. Thank you

@LibertyLakeWildlife 3 ай бұрын

The direction of gain will be in the direction of the driven element. Draw line from the reflector wire to the driven element and that is the direction.

@Petersg1964 3 ай бұрын

@@LibertyLakeWildlifethat's what I thought but was sure you could confirm or correct me and share the right setup. Will be interesting to see if and how it works. if the polarization will match for ceibal rx Stratton and if I get gain or of it. Will compare to a 1/2 and a 5/8 Wire Antenna. thank you very much 👍👍

@dmoney4622 3 ай бұрын

Can you make another video or email me the details on how you interconnected the 10M and 15M moxon. I know you said you didnt like the SWR that you saw so you ultimately ran separate cables. I would like to experiment and nothing for nothing those SWR's were bad for the ease of running 1 cable. KC1POV

@dmoney4622 3 ай бұрын

Can you please do another video and show how you interlaced the 10 and 15 meter moxons when you did attempt to have then interlaced. I have found very little literature and or videos on how to do this. Thank you in advance!

@W8TJM 3 ай бұрын

I never did try to connect them together and only used separate coax runs. If I were to do it, I would likely try bare copper wires with about 1 inch spacing between the feed points and them attempt to connect the coax somewhere along that copper wire interconnection. Not willing to spend the time on it myself so give it a try and report back on your results.

@dmoney4622 3 ай бұрын

At 5:55 you said you interlaced the antenna's and showed 4 swr graphs ... Doesn't that mean they only had one feedline? KC1POV

@W8TJM 3 ай бұрын

@@dmoney4622 The antennas in those graphs had their own separate feedlines. That graph shows how the antenna's physical interlacing affected the SWR. A bit surprising in the direction it took the responses. Good questions!

@W8TJM 3 ай бұрын

Also.... Check out the QRZ page for HB9DSP and you can see one implementation of a multi-band Moxon. He has had good success with it.

@dmoney4622 3 ай бұрын

I understand what you are saying with both antenna's near one another... thank you for the quick responses! 73 de KC1POV

@John-me9dt 4 ай бұрын

Screw .metric!!!!!!!!¡¡!!!!!!!!°°°

@John-me9dt 4 ай бұрын

How does this compare to a 5/8s wave .,,??

@ingeniousys 4 ай бұрын

Very interesting and helpful video. One correction on your slide of "Why is the driven element shorter than expected?" : The velocity factor in the lower right-hand corner of the table should not be 0.81. Dividing 430 by 492 will yield an implied velocity factor of 87.4%, not 81%. That difference threw me for a while when I was doing calculations and comparing to Moxgen-generated dimensions.

@W8TJM 4 ай бұрын

Hey, good catch, and you are spot on! Glad to hear it is correlating with Moxgen analysis as well.

@robbannstrom 4 ай бұрын

This is really good, thanks, and I've linked to this video from my own antennas website.

@europa8117 5 ай бұрын

You can make the dividers with nylon thread. They can be used as two round electrical terminals. It will be much lighter and will give a better adjustment of the ROE.

@bduff5004 6 ай бұрын

Great explanation thank you. I am going to attempt this. N4STS 73

@gam67 6 ай бұрын

If you ever decide to sell the 10m version, please let me know. Unfortunately, I can't build antennas myself.

@W8TJM 6 ай бұрын

I did sell two of them locally. If you can find someone still stocking the MFJ Moxon, that is a pretty good deal at 160 USD.

@gam67 6 ай бұрын

@@W8TJM I'm very interested in your design. If you have one available for me next time, please let me know. I'm not in a hurry.

@skyl4rk 7 ай бұрын

Do you think there would be an advantage to angle the driven element up to increase the takeoff angle?

@W8TJM 7 ай бұрын

It seems keeping it horizontal works the best. You might try modeling it with EZ Net to see what you find. Usually you want a low take-off angle.

@СергейГоронович 7 ай бұрын

Дуже гарне виконання, креативний підхід! 73,DJ5RG=UR5RG.

@Gabaab 7 ай бұрын

how does this compare in losses to a decent autotransformer or "unun" like 49:1 commonly used for end fed antenna?

@W8TJM 7 ай бұрын

Quarter wave transmission lines are extremely efficient so the loss is extremely low. No ferrite or winding coupling losses to consider at all. Big disadvantage is that it is single band, but it does give you the most efficient half-wave antenna possible. Those 49:1 all band solutions are a compromise, but they do work once you tune them in.

@Gabaab 7 ай бұрын

@@W8TJM i will try one for 10 meter band honestly, lower frequencies seems like too much hassle adding the extra 1/4 wave twin lead makes things much longer and unwieldy. do you have the correct 10 meter measurements?

@W8TJM 7 ай бұрын

@@Gabaab Send me an email on my QRZ.com page and I will send you the most up to date dimensions.

@nickkendall3764 8 ай бұрын

Grate video I look forward to more from your new channel you did a grate job antennas are one of people's main obsessions in radio me included I look forward to more

@harryszwergstatt2879 8 ай бұрын

Very good ! 👍

@W8TJM 8 ай бұрын

Thanks Harry! Hope to see you on the bands.

@harryszwergstatt2879 8 ай бұрын

@@W8TJM Maybe with this antenna ;-)

@harryszwergstatt2879 8 ай бұрын

Amazing! A really good antenna solution!

@JohnMcIntosh-io3fe 10 ай бұрын

Just built this antenna and put it on the air. First contact was New Zealand, 8449 miles. Easy to build, and works great!! Thanks for sharing this plan Toivo

@genoa1979 11 ай бұрын

I want this for 17 meter 😊 good proget IU1RZX 1AT227 livio

@johnsonstechworld Жыл бұрын

Nice video. Hope to see you on band some time. 73 de VU2JO

@W8TJM Жыл бұрын

Thanks Jon! Would love to work you this summer as conditions peak. Take Care and keep having antenna fun!

@johnsonstechworld Жыл бұрын

@@W8TJM Sure!

@martindavies6640 Жыл бұрын

Hi could you please give me the wire length for the driven element in feet and inches,and also the reflector best regards Martin

@W8TJM Жыл бұрын

Those lengths are in the video under the wire assembly instructions in meters. In inches, the reflector is 194 inches long and the director halves are 91.3 inches long. I hate doing English conversions so always use metric. 73

@14KiloWhisky 5 ай бұрын

Lazy guy ... 😮😂

@barrygkx Жыл бұрын

Great video. I really enjoyed it. Easy to follow instructions and some neat tips along the way. Barry, KU3X

@W8TJM Жыл бұрын

Thanks Barry! Coming from someone as experienced as you, that is a big compliment. 73, Toivo

@michaelrogers3078 Жыл бұрын

Your video is interesting, your presentation skills are quite good, and your video production is very good. Well done! 73 N4MJR

@DK5ONV Жыл бұрын

That Moxon is a beautiful Antenna and works great

@W8TJM Жыл бұрын

Thanks Guenter. I've been surprised how well it works only 6 meters off the ground. Just busted a pile-up with 8G15S in Indonesia on the second call! Hope to work you soon.

@14KiloWhisky Жыл бұрын

Nice 😃

@lilbump406 Жыл бұрын

Are there any gains from this design over the normal rectangular moxon?

@W8TJM Жыл бұрын

Modeling it with segmented arcs, it behaves like a rectangular one with slightly more forward gain and a more complicated back-side pattern. I've been super happy with how it has worked out with practical on-the-air performance, as it has gotten me to 166 countries worked, mostly on phone, from an HOA.

@trevorhaines2274 Жыл бұрын

Hi Toivo. I think your design is very clever. Re the interlacing affecting 10m VSWR, given you have seperate coax feeds, why not lift the 10m antenna higher on the mast to get some vertical seperation to the 15m antenna. I’ll bet as you lift it there will be a point where the VSWR starts to return to levels like the independent readings you got. Worth a try? Cheers Trevor VK3DCQ

@W8TJM Жыл бұрын

Trevor... That is a solid suggestion! I think it would indeed get the antennas to be a bit more independent. Only negative is that it adds weight with the additional boom and bits needed, but it is certainly worth a go.

@jasonash9121 Жыл бұрын

This is such an excellent video, Toivo. Bravo. I've been poring over your video on the 10m Moxon in recent days, and gathering parts I will need to replicate it. My wife keeps asking why I would ever need four fishing poles when I don't even fish. Now I fear she might be wondering why I am burying a PVC pipe in the yard and very delicately snipping bits of wire of the end of a ladder line in the driveway. I'm so grateful to have HAM operators such as yourself providing such valuable information on KZbin. In my small community, I don't have any elmers to lean on, so information provided by those such as yourself is invaluable. Cheers and 73. Jason W2ASH

@bg7jaf 9 ай бұрын

For making moxon antenna I bought a lot fishing poles and after that I am fishing man now😂

@foxman362 Жыл бұрын

can i make one theses for 11meters.

@W8TJM Жыл бұрын

Sure. Just make the wires a few percent longer.

@shortwavesurfer7222 Жыл бұрын

Hi Toivo Excellent antenna build!...I am currently using a single element 10m elongated rectangle loop and it works great...have been thinking of converting it to a moxon using the same footprint..your video is motivating me to do that👍 73 Steve W8SAW White Lake

@jasonash9121 Жыл бұрын

Great video. I'm curious as to what kind of rotator you are using. I've priced a few and they seem pretty expensive. 73 W2ASH

@W8TJM Жыл бұрын

Thanks for the compliment Jason! I bought the RCA VH226E rotator two years ago and have been impressed with how well it works. It is around 120 dollars at Amazon and 109 dollars in other places. I have given it a lot of use and no issues. The push button direction setting is very convenient. For light antennas mounted close to the rotator, it should last quite a few years.

@jasonash9121 Жыл бұрын

@@W8TJM Thanks for the quick response. The price on the VH226E isn't bad at all, especially considering how expensive some of the HAM-specific units are. I think I'll pick one up when I try a Moxon build this spring. Cheers and 73. Jason W2ASH

@imoldovan Жыл бұрын

Has anybody eznec these different arrangements?? I am curious to see how the results differ from actual measurements.

@W8TJM Жыл бұрын

Analyzed them (21 segment arc approximation) before building them and the performance is very close to a normal rectangular version with some parameters life forward gain actually better. Turns out the length of the elements is more important than the shape.

@wildbill1 Жыл бұрын

Thanks for the video. Great job too!

@W8TJM Жыл бұрын

Thanks! 73

@kf7bws Жыл бұрын

For two and a half years I have used a fixed Moxon at 68 deg 20 feet off the ground for 20 meters. I have worked from New Zealand and Australia to Greenland and Finland, Indonesia, China, Japan, East and West Russia, Europe, Africa, North and South America and all 50 states. I am convinced that the Moxon Antenna is the best simple wire antenna available for hams. You have inspired me to remake it so I can rotate it. In all I have confirmed 76 countries, 6 cotenants, all 50states and 730 US counties. Thank you from KF7BWS.

@Jeff-sp7bg 3 ай бұрын

Im not a ham but i use a moxon on 11m cb. I contacted vietnam china and the guam 27.385 lsb the first week setting it up 20 feet high in my 2nd floor apartment. Amazing antenna

@KP68videogates Жыл бұрын

Very cool. I love to see this. Nothing wrong with buying station equipment, but building what you need from materials you have on hand is what it's all about. Thank you for sharing sir.

@Dxing_Adventures Жыл бұрын

Thanks for the informative video. Could you give me some specifications on the toroid that you used for the choke please. I will need to order one in. Thanks, Frank VK4FEM

@W8TJM Жыл бұрын

I normally use 12-14 turns of RG-58 on an FT240-31 toroid for 20 meters, and 10 turns of RG-58 on an FT240-61 for ten meters. 73!

@W8TJM Жыл бұрын

Frank.... Also, Google "G3TXQ chokes" and you will find some charts on how to select the best torroid for a given frequency and coax.

@che59v Жыл бұрын

After years of trying out simple antennas the one element delta loop topped them all, not to mention the big decrease in QRM.

@W8TJM Жыл бұрын

I am a big fan of delta loops also, but they end up being a bit too large for the area where I live. Had one back in 2015 and it did indeed work well.

@che59v Жыл бұрын

@@W8TJM Too large on 10m band? should be more or less the same size (had them both on the same pole, not at the same time that is, lol) but then again, what do an old radio ham like me know, lol Anyways, the delta loop was fed as a vertical and most times did much better than the Moxon without the need for rotator. Enjoy Ham radio testing is all part of the fun.

@Labatts22 Жыл бұрын

Great job!

@michaelrogers3078 Жыл бұрын

I really like your design, and your video making skills are excellent. 73, N4MJR

@W8TJM Жыл бұрын

Thanks Michael. I finished this one up fairly fast so appreciate the comment!

@dougtaylor7724 Жыл бұрын

That is the easiest Moxon to build and acquire parts I have seen. Nice work!

@W8TJM Жыл бұрын

Thanks Doug! It was a fun project.

@MirlitronOne Жыл бұрын

Just discovered your channel, but this video ticks all the "yes!" boxes for me, especially the benefits of the half-wave vertical and the use of the excellent RigExpert analyser. Nice clear explanations too, no fluff! Oh, and adopting the metric system makes wavelength conversion easier... 😉👍

@eduardopower5254 Жыл бұрын

Great design but I think you said "I used 3 telescopic poles" I think I need 4 right?

@W8TJM Жыл бұрын

Ah ha! That does sound confusing on the video! Should have said: "I used FOUR 3-piece telescoping fishing rods......" So yes, you need four of them. Thanks for the comment. It is a very worthwhile project as it works so well when mounted at modest heights. Mine is normally at about 16-17 feet. 73 -Toivo

@kennethblackwell1137 Жыл бұрын

Great looking antenna. Lightweight and physically manageable.

@dougtaylor7724 Жыл бұрын

Excellent presentation!

@KWHaraburda Жыл бұрын

Very clever design. I am going to take this idea and improve on it I hope. I would like to reduce the weight. It looks like the antenna does not line in one plane, but droops down on the sides near the 2 separators. Is it safe to assume this did not affect the performance?

@W8TJM Жыл бұрын

There is very little change caused by the shape or the droop. Have modeled it quite a bit and used it extensively. I like your idea of making it lighter, and I have been looking for plastic channel material for the boom and rod supports as well. Have fun with it!

@don_n5skt Жыл бұрын

Thanks Chuck. Really looks like some fun projects.

@DK5ONV Жыл бұрын

I am really blown away. I put this Antenna on my personal DIY to do List. Tnx for sharing. 73 & happy Humpday de Uncle Günter 💯👌🙋‍♂

@W8TJM Жыл бұрын

Danke for the comment! I will email you some further detail if you would like.

@DK5ONV Жыл бұрын

That Antenna looks sweet. 💯👌

@Snarky_Radio Жыл бұрын

Best vertical video everrrr! Seriously. Nice to keep it simple. Thank you and 73. K1QS

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