Many thanks!

Great!

A primise is indeed a promise! Great fun though!

I also worked CB radio DX out of my parents' basement in 1970's. My late father gave me a 1963 ARRL Handbook on making radio equipment and antennas. Some of the theories have changed since then, but many remain the same. My father was a US Navy patrol bomber radio operator and aviation electronics technician during the Korean War and later became an electrical engineer, employed by the Navy. He helped design RADAR for Skylab and for AWACS.

Excellent!

Rock on!

Enjoy!

Have fun!

Glad to help!

Thanks!

Have fun!

So nice of you

OK... DJI Mini 2 is fine for this with fishing line and a small weight with a "drop" mechanism (the drop thingy is about $30 on Amazon).

YES!!!!

I'd call that future proofing.

Got a question for you brother. When I hook up my amp, my SWR jumps up to two. It's normally under 1.5. what do you think could be causing this? I saw something about the length of jumpers between the transmitter and the amplifier. Do you think that could possibly affect it I have a 3 ft jumper now some guy said he put a 6 ft jumper and it corrected the issue. I don't see how it could be changing the impedance? Thank you in advance for your time and knowledge

Drums.. WHo knows. Soon maybe!

Well, you can't beat a dipole.. Or maybe a loop? 11m of wire and a 4:1 balun (or you can match it with a quarter of a wavelength of 75 ohm less velocity factor - maybe too complicated..). On the other hand.. Try a linear loaded vertical? Assuming you can actually stand, or nearly stand in the loft, you could probably go up-and-back down with the same piece of wire. They call it linear loading. Then just trim the "foldback" to tune SWR. Run with some radials, same length as your dipole legs. 2 would do it. About 2.6m long each. Centre of the conductor goes up the element and the braid to the radials.. Let me know how you get on.. Easy fix is dipole - but for vertically polarised signals - say across town, vertical would be better.. Maybe!

468/f is the same as 300/f. You are in the old-fashioned feet and I'm in metres.

Probably not.. It will give you a guide but the demensions are different I suppose.

Very true! But it's still 1m :)

I have never found a way, no.. Annoying but a trade off. With easy, comes other things.. If you select User Wire and then double-click the User Wire, you can only change resistivity and permeability. I just ran some tests and couldn't get the length to change..

Wow. Very cool. Not many folkls like you left! Nice job.

@@DXCommanderHQ I like the work, so I am still working in retirement age while training another generation. I'm the lead engineering tech in our shop. Test equipment has taken many leaps and bounds to become more capable and less expensive. It is a great time to be in the field. Pay is great for those with the skill.

Hmmm. Not certain. I'll take a look.. Thing is you can't make any more RF than there already is..

Length will change pattern.

@@DXCommanderHQ for the better? 😁

You can do, yes. But you would need either very small coax - or make some small jumper leads and just twist the wires together to the coax. That would work.

What if I solder the both ends directly to 3.5mm jack.. is that work!? I just made simple dipole antenna splitting speaker wire.. i just don't understanding how to attach both ends to 3.5mm jack.. i hav to solder both ends to same terminal of jack!? (tip or left) OR one to tip(left) another to ring(right) OR one end to tip(left) another end to sleeve (ground) !!!

Yes, you are probably right!

@@DXCommanderHQ I'm 100% right. Remember, I'm the biggest know it all of all, so I have live up to the reputation. Hey, someone's gotta do it, and I'm not even a ham! Maybe you should do a video on what end effect is, and while you're at it, what makes a dipole resonant. This could include element diameter and what skin effect is, as this will help see the big picture on what's actually happening with the applied voltage wave. This is all related to antenna resonance, hence the length, the topic of your video.

I do like a complete geek..!

​@@arconeagain200$wromg motor m manual

@@UsMan-kn8hd huh?

Amazing! I recorded THAT video last week.. I was going to release it later THIS week (while I'm on hols!)

Same thing.. Say 100Mhz. So 300/100 = the 3m band. Quarter of a wavelength will be 75cm (30 inches).

@@DXCommanderHQ Ok cook is that 30" total or per side

I appreciate there are formulas for converting science number into a format for carpenters! (ducks) :)

Forgot to mention this measurement is per leg eg 7.100÷73=10.281m per leg

Yes, - I think there's a name for that.. I tried making one for 80m. I called it the Banana - but I was getting too much loss through the choke I think.

Erm.. Not quite sure which bit. If you are stuck, drop me an email or track me down on discord.io/dxcommander

@@DXCommanderHQ I down loaded the calculator Callum but it's just won't let me put anything into it to calculate

Well, in my book, being a scientist, and staying with metric makes everything EASIER. It's not an esoteric formula that only converts metric to what frankly looks like a random number anyway. I show you in simple maths terms, speed of light/Freq. The other problem is that only 4% of the world isn't Metric; United States, Liberia, and Myanmar. My audience is also the other 96% :)

@@DXCommanderHQ I learned and use both. But for antennas its always been easier for me when building an antenna to use the formulas that I'm used to using. The tests long ago when I was first licensed, had questions about using the formulas. As for the number that use which one for antenna designs, there are by far more that use Imperial measurents for antenna design than use metric for antenna design. :-) Its still a very good video! And explains the relationship in simple terms.

Insulated wire needs shortening due to VF (which is very much dependent upon the type of insulation), in addition to the end effect. Metric measurements are far more intuitive than imperial. Just think about it.... You know immediately that a 1/2 wave dipole for 20m will be somewhere around of 10m long. A 1/4 wave vertical for 20m band will somewhere around 5m tall. So easy.

@@petemillis4666 Velocity factor has very little effect on the electrical length of a wire. What if I wanted a dipole for 6.5 Mhz? How many meters is that? How long would it be? How did you come up with the length? I just use 468/6.5 = 72 feet. The best way to come up with what you are used to. There is no best way for everyone. Just think about it......

@@keslimmer 150/6.5 = 23.08m