Thanks Callum! 😊 Glad you're using it and hope it's useful. I'm M7UAC now :-) The history is there until you refresh the page, means you can re-test and see what it told you to do before.
Sent you a lengthy email to hopefully have you provide an answer a simple question. I appreciate all you do for the community with all the teaching an education.
Neat! I'm still using the pen and paper to work out how much I need to cut or add. Now I can just call up your website on my phone and do it that way. 73 Ed.
I've done the same with my 160 meter inverted L, where it is not "inches" you are folding back , it is more like in "feet" you fold back for it to resonate properly lol, good stuff....!
Thanks Callum, just about to tune my new DX Commander and have been reluctant until I got a set of stable SWR reading. This new calc (was using your spreadsheet) will help but I still might send you my figures as have a problem on 30m using the 80m inverted L. Regards Helen 73.
Wow. If there would be inputs for initial length, initial foldover length, measured freq, desired freq and % wavelength, then one could fine tune a 5/8th with one set of measurements one cut for any velocity factor wire. So how long is antenna, foldback, measured freq, and desired % of wavelength and desired frequency.
Hello Callum , I wanted to share my findings regarding drilling holes through walls and cavities for transceiver coaxial cables . Ideally it is best to drill a 45 degree diagonal hole through the wall rather then just a direct inline hole , the reason being 45 degree provides a gradual curve cable line transmission , for cable protection & aesthetics this process will require a wide panel construction with baton frame & sheet board on the exterior of the building & possibly internally too depending on the environment situation , this installation method will inevitably require more cable length , time & material cost , alternatively the panel construction would not be required if the cable line transmission was carefully calculated through a wall cavity using a mousing line , both pilot methods will cancel out coaxial angle stress . For further RF added protection against signal loss & noise reduction the coaxial cable can be placed through a flexi steel conduit from the radio operations area , if the steel flexi conduit diameter is that of the correct size it can more or less terminate directly up to the PL259 plug to the transceiver itself , this process would be the ultimate isolation in coaxial cable line transmission . The flexi steel conduit is that of steel IP 54 PVC coated in black , it has excellent flexibility & endurance . The entire installation would require precision calculation , the steel conduit would be intersect to copper tubing on the exterior line transmission to the antenna switch unit or the antenna itself . The flexi conduit would require grounding at a convenient point . The remarkable aspect of this process is that a relatively inexpensive coaxial cable can be used , hence the entire metallic shielding , this of course is understandably subjective , ie power rating among other factors . I hope that the above has been of some interest & I think that it would be nice if you could possibly share this process to others ?, it may help some towards the radio communications hobby in one way or another .
So am I right that the velocity factor of the wire is irrelevant using this calculator because with a measured resonant point the VF drops (cancels) out of the equation. Cheers Calum.
Okay when you speak of resonance are you talking about the lowest swr? Is that truly the resonant frequency of that band? Hopefully someone will answer this for me.
Most times resonance equals best SWR, yes. However you can have something that is resonant that will never have a good SWR. Dipoles, Verticals and Loops (with a 4:1 balun) in MOST cases will have natural impedance that will show a low SWR to 50 ohm coax.
How can I change the resonance (down) of a folded dipole made of aluminum tubing without rebuilding the elements to a longer length? Can I add a 'flag'?
Roger that. I've hunted, and can't find it either. Callum embedded the on-line calculator on his page, but there doesn't seem to be shared a link to it.
I don't know what search Engine you folks are using..! "M0MCX SWR CALCULATOR" www.m0mcx.co.uk/quick-swr-calculator-for-vertical-and-dipole-ham-radio-antennas/
Being pedantic about 0.07% increase in the speed of light? Is this being used for a hobby or would you be using an online calculator for a NASA or military project? And please don't complain about the precision of my percentage rounding.
@@Νίκο-δ7τin that case, I will bow my head in shame. The difference in realistic terms is insignificant though. But I confirm in the calculation, 300 Mm/s is used for the speed of light.
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Thanks Callum! 😊 Glad you're using it and hope it's useful. I'm M7UAC now :-)
The history is there until you refresh the page, means you can re-test and see what it told you to do before.
Ah! Hello old friend.. We did get it working and LOTS of folks using it. Diamond!
Nice little addition to the tool box. Thanks Callum and AubsUK!
No problem 👍
Sent you a lengthy email to hopefully have you provide an answer a simple question. I appreciate all you do for the community with all the teaching an education.
OK.. I am away until next Friday.. But I'll giove it a look. Warning, I have ADHD and genuinely have trouble reading long pieces of prose!
Loved the drum fill.
Thanks, Cal, for the great update.
Any time!
Neat! I'm still using the pen and paper to work out how much I need to cut or add. Now I can just call up your website on my phone and do it that way. 73 Ed.
Awesome! Thank you!
As always, thanks Callum!
My pleasure!
Constant evolution, good stuff Sir!
Always!
I've done the same with my 160 meter inverted L, where it is not "inches" you are folding back , it is more like in "feet" you fold back for it to resonate properly lol, good stuff....!
Yes.. LOTS of feet!
Well that's very swr. Great job 👍🏽👏🏽
Thanks 👍
I love using my tuner to tune antenna to resonance 👍
That's cheating :)
Thanks Callum, just about to tune my new DX Commander and have been reluctant until I got a set of stable SWR reading. This new calc (was using your spreadsheet) will help but I still might send you my figures as have a problem on 30m using the 80m inverted L. Regards Helen 73.
80m Inverted L.. You SHOULD see a dip at around 11.5MHz. Unless it's a 12.4. In which case, happy to chat. Sure.
well done Call, thanks for nice tip. cheers!
Any time!
You are The Antenna Alchemist….. 💎 💙
Nice I was wondering about a full wave loop and you answered it near the end... multiply the 1/4 wave by FOUR. Thx Calum Art W1SWL
You got it!
Thanks for that Callum👍
You bet
Wow. If there would be inputs for initial length, initial foldover length, measured freq, desired freq and % wavelength, then one could fine tune a 5/8th with one set of measurements one cut for any velocity factor wire. So how long is antenna, foldback, measured freq, and desired % of wavelength and desired frequency.
Hello Callum , I wanted to share my findings regarding drilling holes through walls and cavities for transceiver coaxial cables .
Ideally it is best to drill a 45 degree diagonal hole through the wall rather then just a direct inline hole , the reason being 45 degree provides a gradual curve cable line transmission , for cable protection & aesthetics this process will require a wide panel construction with baton frame & sheet board on the exterior of the building & possibly internally too depending on the environment situation , this installation method will inevitably require more cable length , time & material cost , alternatively the panel construction would not be required if the cable line transmission was carefully calculated through a wall cavity using a mousing line , both pilot methods will cancel out coaxial angle stress .
For further RF added protection against signal loss & noise reduction the coaxial cable can be placed through a flexi steel conduit from the radio operations area , if the steel flexi conduit diameter is that of the correct size it can more or less terminate directly up to the PL259 plug to the transceiver itself , this process would be the ultimate isolation in coaxial cable line transmission .
The flexi steel conduit is that of steel IP 54 PVC coated in black , it has excellent flexibility & endurance .
The entire installation would require precision calculation , the steel conduit would be intersect to copper tubing on the exterior line transmission to the antenna switch unit or the antenna itself .
The flexi conduit would require grounding at a convenient point .
The remarkable aspect of this process is that a relatively inexpensive coaxial cable can be used , hence the entire metallic shielding , this of course is understandably subjective , ie power rating among other factors .
I hope that the above has been of some interest & I think that it would be nice if you could possibly share this process to others ?, it may help some towards the radio communications hobby in one way or another .
I'm only half-lost! But thank you!
Your very welcome , indeed it is quite a lot to take in , but well worth it once all the information is digested .
Very useful! Mark, 2E0MSR
That is Fabulous!
Excellent
Thanks much Cal
Very welcome!
Brilliant!🏆
Very nice
So am I right that the velocity factor of the wire is irrelevant using this calculator because with a measured resonant point the VF drops (cancels) out of the equation. Cheers Calum.
That's it!
Okay when you speak of resonance are you talking about the lowest swr? Is that truly the resonant frequency of that band? Hopefully someone will answer this for me.
Most times resonance equals best SWR, yes. However you can have something that is resonant that will never have a good SWR. Dipoles, Verticals and Loops (with a 4:1 balun) in MOST cases will have natural impedance that will show a low SWR to 50 ohm coax.
How can I change the resonance (down) of a folded dipole made of aluminum tubing without rebuilding the elements to a longer length? Can I add a 'flag'?
Down.. so you need to add..? OK, try insulated wire coming back on itself.
Thanks bro!
You bet!
Tnx for info❤
Welcome 😊
Is there such a thing as a Fan End Fed antenna with multiple tuned elements coming out of the transformer?
Erm.. Feasable but the harmonics would poke through everywhere.
@@DXCommanderHQ Thanks Callum!
Where is the link to the new calculator? Aubsuk not found on you tube.
Roger that. I've hunted, and can't find it either. Callum embedded the on-line calculator on his page, but there doesn't seem to be shared a link to it.
I don't know what search Engine you folks are using..! "M0MCX SWR CALCULATOR" www.m0mcx.co.uk/quick-swr-calculator-for-vertical-and-dipole-ham-radio-antennas/
I'm here! The only version of the calculator is on Colin's M0MCX SWR Calculator page.
Can you share the link to AubsUK's on-line calculator? THANKS! 73 de KB3ZIM
Yes.. As I explained.. All search engines I have used find this.. "m0mcx swr calculator".
The only version of the calculator is on Colin's M0MCX SWR Calculator page.
Link to the online calculator?
www.m0mcx.co.uk/quick-swr-calculator-for-vertical-and-dipole-ham-radio-antennas/
Thank you !
Can you tune a fish? Lol
Only sea-water ones.
Calculates at the speed of light 300,000,000 and not 299,792,458?
If you want to measure in halves of millimeters, be my guess. But you didn't see to the drop in edit? I said that anyway. Good night ! :)
Being pedantic about 0.07% increase in the speed of light? Is this being used for a hobby or would you be using an online calculator for a NASA or military project?
And please don't complain about the precision of my percentage rounding.
@@AubsUK IT WAS a question ! ! !
@@Νίκο-δ7τin that case, I will bow my head in shame. The difference in realistic terms is insignificant though. But I confirm in the calculation, 300 Mm/s is used for the speed of light.