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Excellent! Thanks for this!

Cose HARP start working

Your red-eye shift paid off! Congrats Colin

Thank you for the explanations, what software do you use for the analyses? Good luck, 73 QRO. CN8RED

What is this?

Awesome!

Simply Outstanding!

I can feel the excitement coming through. What more proof do you need? Fantastic Regards Mike

I think he’s on a 7el triband yagi. 2 element on 15. Good to hear you so loud into ky. I’m 40 miles north of Steve in thoroughbred capital. Many 100’ plus towers around. Just guyed really well 😆

Good to see how the other half live hi. A bit bigger gap between your calls would help us old guys hi. Every time tonight I went to call, but realized you were cq again. Good luck. Zl3xdj.

So well thought out and executed Colin. Look forward to the next instalment. Regards Mike

I thought about this, and your modeling assumes a 100% efficient 49:1 UNUN. Which won’t be the case, especially on 12m & 10m with the typical 240-43 based UNUN. They are only ~72% efficient range at higher frequencies . The 1/4 wave MAY be better on those bands? Some of your newer torroids you have wound seem to be much better on 10 & 12m.

I switched to using 2 FT240-43 cores in my 49:1 UNUNs. They seem to work better with lower SWRs than a single core. I only run 100 watts. The primary and secondary windings are separate for no common mode current in the coax.

Thanks for the excellent idea and implementation! Two quick questions: 1. How do you make a good connection from the antenna wire on the reel to the transformer? 2. Have you tried this with braided bare copper or tinned copper? If so, are the results better. Thanks again. Tony KE1TLG

With the heat generated would it be better to vent the enclosure or simply forgo the enclosure?

Is this a 100pf 2kV capacitor?

The issue is indeed transformer inefficiency. At 1500 watts and the typical efficiencies of these transformers you will generate approx. 300 watts of heat. Place these transformers in a plastic enclosure, without cooling, and they will surely fail if high duty cycle modes are used. Unless you can keep the heat generated to low levels or add cooling and limit duty cycles these transforms are not reliable. The military immerses this type of transformer in a coolant oil and use a metal enclosure to dissipate the heat. With the typical efficiencies of these EFHW transformers (80% range) It does not matter how many cores you use in the transformer. More cores will just increase the time it takes to heat up to the point of transformer circuit or enclosure damage.

Looks great and I'm sure works great 😊 73

Just incredible the amount of work you've put into this. Huge contribution to the ham radio community! vy 73 Leo DL2COM

Well, wish to by it:)

Thanks Colin. Great videos. Yesterday I built the 56:1 wide wound on the 1002 and I just tested and trimmed the radiator. I'd be so grateful if you would comment on these results because I'm wondering if I should change it to 49:1. I used 1mm enamel wire on the toroid and 18g on the 67' radiator. SWR dipped to lowest at 6.830, 14.050, 21.150 and 28.100. 6.830 got 1.0:1. 7.050 got 1.4:1. 28.100 only dipped to 1.9. What do you think? Thanks, Scott in NC

Excellent Collin. Thanks for sharing. Best regards 73 Sm3tek

Really nicely designed, Colin! Well done - You have me tempted.

Great video! I just got ten of these toroids in from Mouser.. cost me like 63 dollars. Also got some TDK 100pf caps. I am going the autotransformer route... the efficiency looks good 160-10. Now I just need to 3D print something to mount them on. I have quite a few 240-43 toroids but have decided to not use them as I don't run more than 100w anyway.. may make up some stacks of three 240-43 just to see how they test out compared to these nicer toroids.. These are heavy and chunky, they feel good in the hand..lol

Colin, do you ever watch “Escape to the Country” on the BBC? Escape the small garden and give the kids their play area free from antennas and RF. lol. Another great video thanks! I am going to send you some TH-cam links to my QRP portable backyard station on lake Hartwell here in South Carolina. Enjoying some ARRL field day contacts this weekend. 73 Michael N9XY

Congratulations Colin! I admire your patience, I know I would’ve put coax on it and tried it out today. You really did an excellent job from the beginning ideas to where you are today. I hope to work you once you have it up and running. 73 Steve

Thanks for sharing Colin, obviously taking into account you have family items in the garden, so you have to prioritize things, so obviously all the kids stuff must go, radio always comes first mate hi hi. Time putting it up doesn't matter too much, its time on the air working dx I can't wait to see. Well done mate 73.

Great work and build Colin. Not too sure if the size of a bag you need. Maybe a golf bag, gazebo bag. Just for ideas. Fantastic job 👏🏽👏🏽 👏🏽👏🏽 73

thank for showing how long it will take to put up and tear down .

Excellent work Colin. I’ve been looking forward to this video for a while.

Great job Colin! I like the reels I did all of mine on one reel pretty fast compared to a winder.Need to get back to mine soon!

That’s a cracking job colin 👏👏

Awesome concept, love it

That's a nice build - well done. Do you feel like a spider when assembling that thing? ; )

Good night, Colin. Excelent work. Greeting 😀👍👍

Great presentation very helpful 😊

How many watts can this system drive?

We used to buy LCR meters because we couldn't afford ~$10,000 for a VNA. Now VNAs are so cheap, we no longer need LCR meters.

WHAT happens if you mix the cores ? like, the 43 and the 52 together ?

Bloody good show Sir… well done. And again well done for sharing your R & D with the ham community. 73.💎 ⭐️✨💥🛠️⚡️ 💙

I am really enjoying this series, I am impressed with the amount of R/D you have put in to find the best possible components.

What's the best wire length end fed antenna measurement for 10 mter to 80

Just a thought, you could use solid wire jumpers instead of coax. Straight pieces with ring terminals on each ends. Thanks for the video

Have you been enjoying the performance of the hex? I know the bands have been in the crapper for awhile.

Brilliant,just ordered my 200mm aluminum disc

AWESOME‼ Thanks 👍

D HEX COMMANDER 😉

I decided to not build this antenna.... But maybe I will have to:) For sure your videos will help a lot in a future. 73