HAM RADIO: Building a Variable Capacitor, DIY Capacitor, Magnetic Loop

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Mike-M0MSN

Mike-M0MSN

Күн бұрын

Пікірлер: 307
@wayneparris3439
@wayneparris3439 3 жыл бұрын
Nice job for freehand. I spent a lifetime in Aerospace tooling though I am retired now. When you have a lot of identical parts to make, if you can join the individual parts into a larger block you accuracy and speed go way up. If you want to make another tuning condenser after you cut your plates but before trimming to final shape or drilling any holes, you can use double sided tape (very thin) to join all your parts into a block. Now final sanding to shape will go much quicker and the parts will be all the same. When drilling your holes, all the holes will also be the same. If you have even a small hand drill press, that will keep your drill square to your work and a belt sander or disc sander will make final shaping a snap. With better accuracy you can then reduce the gap between the stator and rotor too. Again, very nice job for free hand work!
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Great tip many thanks 😊
@orangmakan
@orangmakan Жыл бұрын
He needs that big of a gap because there might be up to 5000Volts between them when used for trimming a loop antenna.
@MrPanetela
@MrPanetela 3 жыл бұрын
hopefully i an keep this story short. way back in the day, my Dad called a repair man to look at his TV and radio. The repair man first looked at the radio. I as a baby boy thought wow! there's a city in there! The gang capacitor was like a gothic cathedral. Then the repair man giggled and say to my Dad, here's the problem, and proceeded to pull a tiny deceased mouse that had nibbled it's way into the radio for its new home. And of course shorted out the tube while scurrying around in there. Thanks, your presentation evoked a lot of great memories. Wish you the very best, you and your family. This generation will never realize how wonderfully great those days were before everything changed.
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Beautiful story, thank you for sharing. best wishes Mike-M0MSN
@philandmia
@philandmia 2 жыл бұрын
Thank you for the inspiration. I have now built 2 for my antenna tuner. Not as hard as I had imagined.😁
@paulperano9236
@paulperano9236 Жыл бұрын
Love the idea and great execution too Mike. You could design the plates on a PCB system and get them made through the like of PCBWay, 10m boards for a few pound, then use std brass washers to space them. With double sided PCBs and plated holes it could be very interesting.
@jbgreer
@jbgreer 3 жыл бұрын
I feel certain you've explained how effective the scroll saw is at cutting sandwiches. Very effective. Great work, Mike.
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Thanks 👍 almost as good at cutting fingers...
@jeffreydove2036
@jeffreydove2036 3 жыл бұрын
Hi, nice capacitor you made. Though you need to round all the corners or you will leak out at high voltage. I have built some of them also, and yes it is a lot of time. But you have something you built yourself and can now build even better. Great job there. Jeff
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Thanks for the tips!
@stevenlstout
@stevenlstout 3 жыл бұрын
It is important to deburr the edges to reduce arcover. I used to make similar parts on a CNC Punch machine. I would check with local sheet metal shops for a bid. They can make complete parts that are drilled and deburred very quickly.
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
De-bur very important.. and yes next time CNC it maybe££
@lc79tourer26
@lc79tourer26 Жыл бұрын
Ahh, I see you beat me to sharp edges bit already, sorry to have made the point again. Something to be said for reading comments first before shooting my mouth off.
@maurasmith-mitsky762
@maurasmith-mitsky762 2 жыл бұрын
Excellent video. Lots of work involved. May your new variable capacitor serve you well.
@mike-M0MSN
@mike-M0MSN 2 жыл бұрын
Many thanks!
@andrewskater8813
@andrewskater8813 Жыл бұрын
Impressive dedication! I bought an old radio to get the tuning capacitor and germanium diodes and after destroying some of the polystyrene capacitors realised it did not have germanium diodes and was using tube diodes as detectors..............so months later I am slowly getting the radio to work as a restoration project
@americaswayout4489
@americaswayout4489 3 жыл бұрын
I think the word you Brits use to describe something fantastic is BRILLANT, so we can go with that. Years ago Crushcraft sold a vertical called an R3 it had some traps for 10,15,20 but also used a capacitor like you just built with a motor and outside box plus it had a control box for inside. I acquired the control box, have a 24-28 volt motor and should have other parts to try to make something work. I also have the driven element from an av4 beam that is about the same as the r3. You make everything seem so easy, but every time I try a project, some hard to find or use tool gets in the way. Trying to build some spreaders for a version of DX Commander the key whole size was not available. You really have a lot of talents !! If you get bored or would like a challenge, I would send you the control box and other parts if you would like to tackle building the outside box, etc to remote tune the antenna. The control box has the voltages etc? Also, the same inside control might be stable with other capacitor tuned antenna like those loops you have built recently?
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Maybe one day, but for now I have too much to do... thank you for your nice comments
@BoB4jjjjs
@BoB4jjjjs 3 жыл бұрын
You should be proud of that one Mike! Excellent, I would not have thought to try it. I threw a box of these out when I got married, never thought I would ever have a use for them :-(( the daft things one does when moving house in a hurry!
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Yes I think I did the same, we live and learn.. :)
@hydromakers
@hydromakers Жыл бұрын
absolutely the finest capacitor that i have ever seen.
@hyperionsixzeroeight5064
@hyperionsixzeroeight5064 Жыл бұрын
I seem to remember kits being available to construct variable caps. Hamfest flea markets another good source. Surplus military gear (old stuff) another source for us scroungers.
@thehulkster2707
@thehulkster2707 3 жыл бұрын
Very helpful and an inspiration because the price of variable air caps are through the roof..ty
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Glad it was helpful!
@stephennelson-smith3312
@stephennelson-smith3312 2 жыл бұрын
Super job - it came out really well! I must say I did chuckle when you baulked at the price of a VC on ebay, and then spent twice as much on just the saw, let alone the parts, but inspiring all the same.
@ConsertandoTudo
@ConsertandoTudo 3 жыл бұрын
To people looking for a way to make it, and does not have access to all tools, that could be made using raw printed circuit board and a rotatory (?) sand papper. Prefer fenolite (?) pcb over fiber glass. Great job.
@AGeekNamedRoss
@AGeekNamedRoss Жыл бұрын
Next time, for that semi-circle notch on the stator plates, try this: Drill the holes first, then cut them out. That small diameter semi-circle is hard to get right with a scroll saw. Also, this project would warrant the purchase of a small drill-press.
@joewoodchuck3824
@joewoodchuck3824 Жыл бұрын
Nicely done! There's a design I have in mind that's much easier to make. I'll just cut out squares. Drill a hole in one corner for shafts so the square is used as a diamond shape, and nip off the opposite corner to clear the next shaft. I know it's a little unconventional and won't look as cool as semi circles but I'll save a lot of time. Accumulating hardware as I go along.
@michelemarchitiello1868
@michelemarchitiello1868 2 жыл бұрын
Complimenti. È bellissimo questo condensarore variabile, costruito con le tue mani.
@problemwithauthority
@problemwithauthority 3 жыл бұрын
I remember the sound of using a scroll saw on metal...makes a heck of a racket.
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
yep, next time, ear plugs.
@quebirt
@quebirt 10 ай бұрын
Very cool. I assumed special materials and exact spacing would be required. I may actually give this a go. I have a very nice variable capacitor that came out of an old ham radio but it's lost in my "collection."
@Joe-KN4IFI
@Joe-KN4IFI 3 жыл бұрын
Great work Mike. Doing plate after plate can get a wee bit tedious. 73 Joe
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
yep two days of work one cap... :(
@DavidALovingMPF102
@DavidALovingMPF102 6 ай бұрын
Nice. the variable caps I use for my homebuilt A.M. radios have gone from $15 to $36. 10 pf to 360 pf. I too am looking into making my own. Thanks!
@southernexposure123
@southernexposure123 3 жыл бұрын
Real nice job on the cap. A few years before I bought a commercially made antenna tuner I red necked a tuner together from junk box parts. My coil was the spring which was still in a 5 subject school notebook and the variable cap was from a defunct 9 volt transistor radio. I switched the number of turns on the coil using Rat Shack test jumper wires. You remember those. They had spring loaded alligator clips on each end. Oh, and the 5 subject notebook served as my log book. lol I used it with a 200 watt Swan 400 tube rig and it never arced. My key was a Rat Sheck roller switch - hand held. ((-: Long live CW.
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Oh I remember them, great times. Cheers
@g0fvt
@g0fvt 3 жыл бұрын
An interesting project, well done, I may make similar but using double sided PCB for the plates with brass hardware. Watching the test I got the impression your minimum capacitance would be lower if the lower pates were a simple rectangle below the spindle. Not being critical but would make construction a little easier. I do see some companies offer water jet cutting..... might be worth looking into?
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Great idea
@sheilamoore6255
@sheilamoore6255 2 жыл бұрын
Yes, all you need is a 300 dollar table jigsaw, some high-dollar aluminum plate material, etc., etc., to make your very own variable capacitor!!! Great!
@mike-M0MSN
@mike-M0MSN 2 жыл бұрын
😂😂😂💋
@philippejoigny5928
@philippejoigny5928 3 жыл бұрын
Congratulations Mike for this wonderful achievement! 73, Philippe (F1PBT)
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Merci beaucoup pour vos commentaires
@PE3FS
@PE3FS 3 жыл бұрын
nice prototype and a lot of work . I hope you don't forget to peel of the plastic from the alu. The value is a bit different then. But I am sure you know. looking forward to the next video
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Thanks, will do!
@chuckmaddison2924
@chuckmaddison2924 9 ай бұрын
Impressive, I tried a couple of years back, and it was a glorious failure . After seeing this might have another attempt.
@SuburbanDXing
@SuburbanDXing 3 жыл бұрын
All I can think of here is that if I tried half of the stuff you do, they'd call me "Lefty" (with the local hospital getting plenty of my gear money). Fun to watch your craft, Mike...good stuff. 73! de WX0V
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Thank goodness for the NHS
@SuburbanDXing
@SuburbanDXing 3 жыл бұрын
@@mike-M0MSN Indeed...hopefully I will not be in use of their services...keep up the great work here...73!
@lc79tourer26
@lc79tourer26 Жыл бұрын
Very nicely done, My only thought would be to try and get rid of any sharp edges that might help avoid arching, other than that, a good effort.
@warrenkeillor9034
@warrenkeillor9034 Жыл бұрын
That is inspiring! I too have always wished to get a big air gap capacitor. That is a nice simple design. I wonder how large of range one can possibly get with this concept, going big?
@Timtron432
@Timtron432 Жыл бұрын
Hi Warren, A friend of mine that has a cnc water jet cut all my parts for a very very very big air variable cap lol 900 pf minimum to 1.8 uf max that i put inside a plastic sealed clear box. I use it to tune and find the peak's when i tune the coils of ( Not A BiTT or A BiTT ) The variable 1.5 uf cap is used with other ac caps to get in range and find the peak output of the BiTT or Not A BiTT.. Cheers!!!
@Stelios.Posantzis
@Stelios.Posantzis 3 жыл бұрын
You could have stacked the plates together and secured them in a vice, with some support blocks judiciously placed, before filing them. That way you could get uniformity. Achieving uniformity with the spacers is more critical to making a precision part and also harder to achieve but still doable. It would be best to cut them using an alignment jig though in order to minimize the filing work needed afterwards in order to get them all to be square cut and of the same length.
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Yes, a vice is the next purchase.
@TEGEscalator
@TEGEscalator 3 жыл бұрын
73 Mike, great achievement, but you have to be patient. I was just talking about it this morning with my friend but it will be a 500pf. ps: do not forget to remove the blue plastic which protects the aluminum.
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Blue plastic, oh yes
@michealbell5042
@michealbell5042 3 жыл бұрын
Keep up good work I would love to see this with a mag loop🤔👍😀
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Maybe???
@MrMrsteve01
@MrMrsteve01 2 жыл бұрын
Those flux capacitors are crazy. Total banana bibulation and scheming. Been thinking about doing it in a full stasis pizza loadout.
@sagorreza114
@sagorreza114 11 ай бұрын
Wonderful built! Impressive.
@mike-M0MSN
@mike-M0MSN 11 ай бұрын
Thank you! Cheers!
@whamni
@whamni 3 жыл бұрын
Brilliant Mike, soon as I saw you using the file I knew lol
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
;)
@MiscDotGeek
@MiscDotGeek 3 жыл бұрын
FB OM! I built one this week too, but I used PCB's and switches. It actually went to about 400pf, but I don't think it would handle the higher voltages that yours would. My channel has it if anybody wants to see. But I like yours a lot- very properly built and as good as any much more expensive one, if not better :)
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
many thanks I have a visit. :)
@johng.3740
@johng.3740 8 ай бұрын
Good job building the capacitor! I'm wondering if you could cut the individual capacitor plates from plastic or wood, then cover them with a layer or layers of aluminum foil.
@mike-M0MSN
@mike-M0MSN 8 ай бұрын
Yes you can!
@josephleister9198
@josephleister9198 3 жыл бұрын
Excellent work...thank you for sharing.
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Thank you! Cheers!
@waynedavies3185
@waynedavies3185 2 жыл бұрын
Excellent video.... well made.
@thefallenone7988
@thefallenone7988 3 жыл бұрын
Good job because they get an arm and a leg for them these days if you can find them. Although some can be had at a decent price if you look hard enough. 😎👍
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
To true 😀
@Dr._Spamy
@Dr._Spamy Жыл бұрын
One trick to drill holes from even distance is to drill a clamped stack of roughly cut sheet metal peaces all at once. The final shaping could be done after the drilling then.
@jeanlouisberthault7603
@jeanlouisberthault7603 3 жыл бұрын
Very nice job, have a nice day, JB from FRANCE
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Thanks, you too!
@KenPaisley
@KenPaisley 3 жыл бұрын
Nice job. A belt sander and a drill press might make that a lot easier. Why did you leave the plastic film on the plates? Wondering if it changes the capacitance. I would think it does.
@flapjack9495
@flapjack9495 Жыл бұрын
I was wondering that, too. There's no good reason to leave that film on there. It shouldn't change the capacitance too much but it might increase the dieletric losses.
@radioman3229
@radioman3229 8 ай бұрын
Mike-M0MSN, ty for your videos, how can we know what size variable capacitor we need. I am building a loop for 100 watts for 20 meters?
@mike-M0MSN
@mike-M0MSN 7 ай бұрын
the reality is you make the capacitor form 10pF to the best you can get (maybe 200pF) and then play the the size of loop....
@radioman3229
@radioman3229 7 ай бұрын
@@mike-M0MSN ok, ty NS9T
@jmd62800
@jmd62800 3 жыл бұрын
Fantastique job !! You are in crédible , you transform idéal in real !!! ( not,so easy) congrats 👍👍👍
@spuddyspud8178
@spuddyspud8178 3 жыл бұрын
I might have a go at building one.but will see if I can get the plate's laser cut.what is the best plate size to use
@tvdylan
@tvdylan Жыл бұрын
so how do we make capacitors with more pico farrads ? just add more plates ? do we increase or decrease the distance between plates ? nice work !
@M4CHINE69
@M4CHINE69 3 ай бұрын
yes add more plates or make the plate distance closer
@johnnydunphy6396
@johnnydunphy6396 2 жыл бұрын
Top class ..well done .. SIR
@mike-M0MSN
@mike-M0MSN 2 жыл бұрын
Many thanks
@ahmedisml
@ahmedisml Жыл бұрын
Wonderful job
@antonioroccuzzo4214
@antonioroccuzzo4214 11 ай бұрын
Nice job 👍👍👍👍👍
@mike-M0MSN
@mike-M0MSN 11 ай бұрын
Thanks 👍
@ianide2480
@ianide2480 8 ай бұрын
apply contact adhesive to the printed parts and stick aluminum foil to those?
@omsingharjit
@omsingharjit 2 жыл бұрын
you can make it's rang more better and flexible by connecting each stationery plate with jumpers connectors or 7 step rotary switch found in Stepped fan regulators and sure you have to seperate all plate electrically .
@MichaelEdelman1954
@MichaelEdelman1954 3 жыл бұрын
Saw this and immediately subscribed. Very nice.
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Awesome, thank you!
@andyquattro
@andyquattro 3 жыл бұрын
Fantastic work Mike ! I've subscribed so I don't miss the roller coaster inductor video ;-) 73 Andrew G1PPZ
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Welcome aboard! and that's a great Idea too.
@markjhonthan9123
@markjhonthan9123 Жыл бұрын
WoooooW Good job I like . I was want to make one like this but I want made A small variable capasiter
@jeremycole3008
@jeremycole3008 2 жыл бұрын
very nice build. i like it
@TechTed1
@TechTed1 Жыл бұрын
Great job there
@francisauspert513
@francisauspert513 3 жыл бұрын
Thanks Mike (Belgium)
@pierre5325
@pierre5325 9 ай бұрын
Mike, most excellent job Mate!
@AdamosDad
@AdamosDad 3 жыл бұрын
This is real HAM Radio!
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Many Thanks 🤩
@ben2e0omr
@ben2e0omr 3 жыл бұрын
Excellent build Mike. I shall put my order in now please.
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
ha ha,, :)
@kariolavi
@kariolavi 3 жыл бұрын
Looks great Mike! I´ve used a cheap nibbler attachment on my drill. The thickness of the aluminium plate was 1,5 mm and it works fine. Some filing is still needed of course. 73 de Kari OH2BCY
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Great idea.
@ianxfs
@ianxfs 3 жыл бұрын
I’m very pleased too Mike 👍🏻
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Cheers Ian
@attilarivera
@attilarivera 2 жыл бұрын
👏👏👏👏👏👏 Thank You!!! ✌😊👍 💚💛💙 🇧🇷🇧🇷🇧🇷
@jean-marcparatte5564
@jean-marcparatte5564 3 жыл бұрын
Fine work.
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Many thanks!
@iestynwyn4311
@iestynwyn4311 3 жыл бұрын
good job mike. you should have been in the A team tidy
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Merdoc, or Face-man
@husabyrr6496
@husabyrr6496 2 жыл бұрын
Très bonne vidéo. Je me lance pour en faire une.thank you.
@vanpenguin22
@vanpenguin22 6 ай бұрын
Just curious, but, Would it have changed its performance in either direction if the bottom plates were also semicircles?
@mike-M0MSN
@mike-M0MSN 5 ай бұрын
Not really, maybe a little less capacity...
@vanpenguin22
@vanpenguin22 5 ай бұрын
@@mike-M0MSN Thank you for answering 👍
@harryszwergstatt2879
@harryszwergstatt2879 Жыл бұрын
Really great job!👍
@chazrw2chz290
@chazrw2chz290 3 жыл бұрын
Nice build. 👍👍 Although I'd likely be lazy and outsource the cutting to a friend that has a plasma cutter. 😉
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
A friend yes, but a company!!! way to expensive..
@chazrw2chz290
@chazrw2chz290 3 жыл бұрын
@@mike-M0MSN Without a doubt. Really liked your video, gives me all sorts of ideas.
@M7XCB
@M7XCB 3 жыл бұрын
Excellent work love making my own things bet your miss not happy about chest freezer lol
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
You got that right!, but you should see the kitchen......
@M7XCB
@M7XCB 3 жыл бұрын
@@mike-M0MSN haha bad as me I had yaesu 767 Gtl DX on the kitchen table apart for over 1 week yer it took me to fix it my wife was very supportive at least she knows where I am lol
@crazycrab8578
@crazycrab8578 2 жыл бұрын
need this for me crystal radio , nicely done
@kellypaws
@kellypaws 3 жыл бұрын
It’s a talented piece of work, and VCs are expensive. But, and it’s a big but, looking at the tools you have to own, and the time it takes, not to mention the skill, obviously the skill, I was rather thinking there’s a reason they’re dear.
@RssutharJaisalmer
@RssutharJaisalmer 3 жыл бұрын
Wow 😯👌👆🙏
@RobR386
@RobR386 3 ай бұрын
I’m going to build one for my mag loop antenna 🙂
@Nathan1975Liggy
@Nathan1975Liggy 3 жыл бұрын
I would like a go at doing this one day but is there any special calculations that need to be done to determing the spacing of each plate for the power used on the radio? I do know that the larger the gap the lower the capacitance will be.
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
yes but the more power it will handle.
@luckydubeinrc5165
@luckydubeinrc5165 3 жыл бұрын
1mm spacing= 1kv safely.
@Nathan1975Liggy
@Nathan1975Liggy 3 жыл бұрын
@@luckydubeinrc5165 WOW as small as that, many thanks for the reply.
@DedyBlackLaBeneamata
@DedyBlackLaBeneamata Жыл бұрын
incredible idea
@mike-M0MSN
@mike-M0MSN Жыл бұрын
Thank you! Cheers!
@michealbell5042
@michealbell5042 3 жыл бұрын
You have inspired me to build one it's over halfway done. It's very time consuming I don't know if I will do it again😅
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Yep, two days of cutting and filing and drilling and printing and.....
@Tump2010
@Tump2010 3 жыл бұрын
need to get the foot to sit on the work to keep it from jittering. :-) You need to add a disc or belt sander to your tool list to help with the shapes and edges.
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Good call!
@GeorgeWMays
@GeorgeWMays 3 жыл бұрын
That is very cool. Thank you for a truly interesting video. It is much appreciated.
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Glad you enjoyed it!
@boxingday11
@boxingday11 3 жыл бұрын
Thanks Mike 👍🇬🇧
@garyjohnson4608
@garyjohnson4608 Жыл бұрын
How did you know what sizes to make the plates ? Or was it just all guess work ?
@mike-M0MSN
@mike-M0MSN Жыл бұрын
Its all guess work, If you do not have enough capacity just add more plates......
@wfwtheradioguy3414
@wfwtheradioguy3414 3 жыл бұрын
Nicely done.
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Thanks! :)
@andylinton2798
@andylinton2798 3 жыл бұрын
Nice work! But I wouldn't have had the patience to cut out that ally, I'd have got some metalwork place to CNC cut it!
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Next time!
@Melw44
@Melw44 3 жыл бұрын
Nice job!
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Thanks!
@Ind421
@Ind421 3 жыл бұрын
To use in a superhet you have make two of them on ganged configuration.Does it make it bigger?
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Not sure I understand your question sorry. :(
@JoseSilveira-newhandleforYT
@JoseSilveira-newhandleforYT 3 жыл бұрын
Looks good! I wonder, with all the work and expense, if it would not have been more effective to have them cut (water jet or laser) professionally - you obviously have the means to draw the CAD files required. That would also benefit from tighter specifications, allowing for smaller plate gap and smaller size for the same range of capacity (unless you are going for an high voltage application).
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Yes Jose, Laser or water cut is the next level, I wanted to do it all myself first, that way I know it can be done.
@JoseSilveira-newhandleforYT
@JoseSilveira-newhandleforYT 3 жыл бұрын
@@mike-M0MSN Absolutely! And as you got the prototype running very smoothly, it can only get better :-)
@kathrynwhitby9799
@kathrynwhitby9799 3 жыл бұрын
does the size of the gap make any different to the workings?
@g0fvt
@g0fvt 3 жыл бұрын
A large gap between plates reduces the capacitance but increases the working voltage.
@peterdemey1083
@peterdemey1083 2 жыл бұрын
Hi Mike, Do you have the measurements for the alu parts ? didnt vind any in the comment or i overlooked.
@johnpeterson7264
@johnpeterson7264 3 жыл бұрын
Marvelous !
@stevek5416
@stevek5416 3 жыл бұрын
The protective covering on the "al-you-min-ee-um" as you say, is going to give you a little capacitive bump due to the dielectric effects. Don't know how much (or if it will even be noticeable). I would say that you did an excellent job of achieving your goal for a very high Q cap at a very low cost. What cap value were you shooting for?
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Yes will be removed before use.. :) and 200pf so one or two more fins.. :)
@stevek5416
@stevek5416 3 жыл бұрын
@@mike-M0MSN - Depending on the voltage that it will carry (power), you could also use shorter spacers between fins.
@peasant8246
@peasant8246 Жыл бұрын
@@stevek5416 I was about to comment the same thing: 3,5mm spacing between fins is a lot. I would've tried to limit it to ~1mm.
@kirklindstedt2018
@kirklindstedt2018 3 жыл бұрын
Did you find any calculations on how large plate, distance between, etc? or did you just gustimate?
@nevellgreenough404
@nevellgreenough404 3 жыл бұрын
See any copy of the ARRL or RSGB Radio Amateur's Handbook in the first 50 pages or so. These were made your way in the 1920s. Nice build! --N2GX
@kirklindstedt2018
@kirklindstedt2018 3 жыл бұрын
@@nevellgreenough404 Thank you. I found another youtube video that covered the formulas as well (after I posted this question) I also checked my ARRL Handbook 2013, and it was covered in 2.7.2.
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Looks like you have answered you own question, but I guesstimated.....
@markg6jvy135
@markg6jvy135 3 жыл бұрын
Nice build Mike 👍👏👏
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Thanks 👍
@Stelios.Posantzis
@Stelios.Posantzis 3 жыл бұрын
Good call. Ebay prices on these things are astronomical. I guess most of those items have long been scrapped or are simply rotting away in sheds or labs.
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
yep!
@NHaq-e7d
@NHaq-e7d 8 ай бұрын
Would Tin Foil from kitchen not work .. Can you please explain why you choose Aluminum ? I understand you may have current requirements , but for a ham radio it should not need that much current.
@mike-M0MSN
@mike-M0MSN 7 ай бұрын
Foil will burn or pit but it can be used with low power, I used Aluminium because it is malmble and less expensive than Cooper and can withstand high voltages, and when using power of over 50Watts many kV are present.
@peterpauldonoghue7024
@peterpauldonoghue7024 3 жыл бұрын
Hi Mick Did you look into a price of getting them alluminium profiles laser or water cut ? Definitely easier on the ears !!
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Yes, way to expensive for the quantities I want..☹️
@ADVRydrBloke
@ADVRydrBloke 3 жыл бұрын
What filament material are you using in the 3D printer for outdoors / UV. Cheers.
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
Standard PETG, I am not too concerned about it breaking down over time.
@ADVRydrBloke
@ADVRydrBloke 3 жыл бұрын
@@mike-M0MSN thanks mate. I just ordered a 3d printer and intend on making a heap of bits and pieces for various HAM antenna builds.
@mike-M0MSN
@mike-M0MSN 3 жыл бұрын
@@ADVRydrBloke I would start with PLA, it is a lot better to use than PETG, I am finding that the PETG is stringing and needs a lot more work than PLA.... just thought I would let you know
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