In the USA, the threaded poly pipe seem to be a rare product so I figured out that Lowes and similar stores that sell PVC and steel pipes will cut and thread any pipe you buy. They typically thread steel pipe but the same machine will easily cut threads into a PVC pipe. Simply buy a 1.5" schedule 40 pvc pipe and have it threaded as far as you need it.
This video only having 13200 views (as I'm watching it) is a disgrace. This is an absolutely FANTASTIC build with everything explained PERFECTLY! This qualifies as ham radio ASMR. Brilliant, friend! Hope to see more like this!
Is Ham radio and CB radio different or regeraded differently in Australia? Back in America / Canada I have been exposed to some of the same theory and electroincs. On the air i once heard that there are some more abnds and longer distances available with amateur radio. It was a short conversation in CB Radio?😀🗨🗨💥👩🎤🛀👤👩👧👦
@@RolandGirshman Yes, at least here in Australia, it's a big difference. CB, no licence needed, only two bands both short range except under just the right conditions. Whereas amateur radio, there's three licence levels, progressing from Foundation (easy) to Advanced (advanced!) but even the basic foundation gives you 6 bands that give enough options for good comms over 0 to 1000s of km, still depending on conditions a bit😀
@12:28 if you put the hose clamp on it will hold the wire from backing off on you tell you get it threaded in the hole... This is the best build video on this matter yet. Thank you.
Very ingenious and well done. I tried to get a friend who had a pipe threader to thread some pvc pipe for me to make a form. Unfortunately he was afraid it would clog up his machine. I ended up with a Wolf River coil. I wish I had seen this all thread pipe. Never heard of it before. This kind of ingenuity is what ham radio is about. 73s
The integrated feed point and female connection sockets for radials…outstanding. Well done Sir. I’ve deliberated over how to improve those shortcomings for a spell without a satisfactory result. Thank you for sharing your ingenuity with the rest of the amateur community!
Absolutely a top notch presentation, the tutorial has left no stone unturned with a clear and precise explanation of every aspect of the build... Well done, its been a outright pleasure to watch and follow.
wow! I wish I would have found this one sooner on RUclips. after watching HOURS of other videos, the end result always looked like a kindergartner assembled it. yours on the other hand looks fantastic and like a commercial product! I think I will try to build yours with threaded PVC like a commenter suggested. about to start binge watching your other videos to see what else you've made!
Around 14:00, commercial products back in the day would often use a hollow bolt so that the wire could be simply slipped up inside the hollow bolt. The connection might be secured with a set-screw embedded in the hollow bolt. Saves assembly time: slip the wire in, finish the overall assembly, tighten the set screw. Also give a straight wire run from the coil up.
Yes that is certainly a good option and some of my friends have recently made the coil with.a PVC collar with a metal bolt on one side and a nylon bolt on the other to apply force.
I was sitting in the doctors office waiting on the wife and came across your video. I really enjoyed watching it. I subscribed and hope to see more good stuff. 73’s de KY4K
Building this coil in Australia is probably worth while compared to buying the Wolf River Coil, considering the cost of postage nowadays. Thanks for for a great build video.
I was wondering when someone was going to build a similar coil that didn't cost $100. Good on ya mate. I built an antenna a bit like that, but I just used a pool noodle slid over a piece of 3/4" PVC. The coil wound on the foam has very low dielectric loss, and the RF is blind, so it doesn't care how pretty the antenna is. It worked well on 40 meters.
@@maddogshamradio3407, interestingly the pool noodle has lower dielectric loss than just about anything else in the way of a coil form, and because it's soft foam my alligator clip, (crocodile clip in Oz?) can clip onto the coil anywhere it's optimum.
That’s a great home brew HF antenna, excellent production. I fortunately own a lathe and I use thick walled PVC tube and cut a thread using the lathe, made quite a few, I like the idea of the sliding clamp. Note my callsign, VK2KC!
Thanks Scott. Tested it today in preparation for Dorrigo park fest. Tunes up well with a 4.5 metre counterpoise wire from the antenna draped over the front of the car.
Absoutely AWESOME Marty! 👍 This is the best loading coil I have ever seen, and that includes the commercial ones. Thanks very much for sharing your idea. 🙂 The all-thread irrigation risers are a bit hard to find up here in Canada but if I can't find one, I will try printing one on my 3D printer.
Thank you for your encouraging comment. I see that the risers are still available on the Australian eBay store at this link. www.ebay.com.au/itm/294814307544?mkcid=16&mkevt=1&mkrid=705-154756-20017-0&ssspo=dkw15RJmR2W&sssrc=2349624&ssuid=ALpUZn3RQtu&var=&widget_ver=artemis&media=COPY
Good job!! Looks really well-made. I ended up going with the Wolf River Coils though, considering the price and the effort. Probably very satisfying to see such a project completed, but I don't even have a bench to work on. The wife would have expressed her discontent at the sight of parts being spread out on the dining table. :)
Yes I know what your saying. I’m fortunate to have a good size workshop and yard. The WRC is a great coil along with the Slidewinder from M1ECC antennas.
Back around 1995 Don Johnson wrote a book on making the DK3 a screwdriver antenna, in the 90s I made 4 of them, making the coils out of pvc pipe threading at 10 turns per inch, on a metal lathe. we wound them on a metal lathe as well. Thanks for sharing! You have done well! I used 16 gauge buss wire which is solid copper wire tinned, One suggestion after you uncoil your stainless wire, I would give it a BIG tug just to straighten it out so maybe it will go on the coil better.. 73 kd8nv
If we could only get that pipe done up for a cheap price this would be great! I have a bud with a small lathe we might try turning some pipe and see how we get on. Great idea!
Great video and presentation! Very nice build with a clean professional looking product, my hats off to you. Nothing like making something yourself, and maybe save a few bucks in the process too. I watched it thoroughly to build one too. After hours or searching retail/industrial sites I discovered such a poly riser does not seem to exist outside Australia. Someone with a lathe (or local machine shop) could thread a piece of PVC pipe or such - the only possible alternative I've found thus far. An Australian supplier (CONFIT) that ships to the USA is $31.92 per riser + $50 shipping + taxes + custom/import fees not counting the caps or other parts. Which makes it cheaper to buy a finished Wolf River coil ($86.09 shipped) than to even get one poly riser to the USA... bummer. A group or club large quantity buy may get the costs of all the parts for about the same price of the finished WR coil (for any diehard kit builders).
Thank you for your comment. Yes there are certainly many ways to get the end result. There are a few other videos showing different methods and I have added those links at the end of this video description.
A fantastic, very professional - looking build. You could also, fairly easily, do something like WRC's 'Camera Tripod Adapter Plate' and have a universal setup that could go from a mag. mount to tripod in seconds. Thanks for the video.
Thanks Hayden. I’ve been using it for most of my park activations the last few months and I’m very happy with it. I’m using the M1ECC militarily folding whip on top of it. Plus the G90 and 7 Amp/hr battery all fit in a small back pack which is quite lite.
Thank you for the video that’s very nice I will try to make one of those see if I can find everything that I needed thank you again and keep up the good work
As you suggested, I did a google search for all thread risers. All of the responses had a .au url. So, except for Australia, unobtainium. Which is a shame. This is a great idea and very well made.
VK4KC Marty, you've done an excellent job on both of your coil versions, outstanding, just shared with my radio fellows, thanks so much 4 sharing your great job ! XE2YWI Jacob
Great video @maddogshamradio3407 similar poly pipe is available in the UK, however it is only threaded at the ends, not all the way through. Need to get it from Oz or China.
Thank you for your comment. Yes it looks like that is the case with regards to supply. I have linked to a couple of other videos in my initial video comments that you may find useful watching. Cheers Marty VK4KC
Thanks Stephen. I enjoyed checking out your QRZ page. Let me know if you want any info on POTA as I’m the Admin for Australia. The main thing I’m into is portable activating from parks around Australia.
Outstanding! Very good demonstration of the cold. I have one question: the second banana, plug, the one connected to the hose clamp. How is it connected inside the bottom clamp?
Have you thought about connecting the shield side of the SO-239 to the mounting bolt at the bottom to also use the vehicle as a ground plane through the magnet? Great build video!
I should do that. I actually use this more on a tripod now for portable POTA rather than the vehicle as the vehicle now has a permanent radio and antenna installed.
Many have tried to find this riser in America without any success. Peter from Frithys Rural in Australia has the 300mm riser and end caps. You can get the riser and two end caps for about US$20 plus shipping. Frithy’s Rural is on the Australia EBay store. Alternately look at the main text description of my video as I have links to two alternate builds which may be useful. 73, Marty VK4KC the Maddog!
Hi Marty, great to see some Australian content and a great description on an excellent build. Could you please give me some measurements of the radial/counterpoise wire/wires you are using for this antenna as you did on your video for the Mag Dog Coil Jnr. thanks in advance.
@@maddogshamradio3407 thanks Marty, I recently did a 3week trip from Brisbane through to Lightning Ridge And parts of Northern NSW. I found the antenna worked exceptionally well wherever I set it up during my travels. Thank you for the step by step build, keep up the good work.
At 16 minute mark, please explain the bottom of the cap? Since you went past for the boring part you said is important to know, we know the braid part gets attached to the coil, but what exactly is connected, ground and center conductor? Center tap of the UHF connector to the tap? What gets connected to which part? You briefly showed the base, i request a photo of the complete base prior to screwing the cap to the pipe, please? 73 de N2OBS
Great video, the hose clamp idea is spot on. I am making a coil also. My question is what readings I should have when completed and where would I read them on the coil, to see if the coil is working or have, I done something wrong. tx
Glad you liked the video. The measurement of the full coil is around the 100 micro-henries. Once you build the coil with the whip on top and counterpoise/ground wires in place you can use a antenna analyser to find the full frequency range as you slide the clamp from top to bottom. You can then mark on the coil the areas where the amateur radio bands are resonant. If you don’t have an antenna analyser many of the newer HF radios will give you a SWR reading for a particular frequency.
This is very interesting. Thank you but a note... What if you also tie the ground of the so239 to the bolt for the mag mount.. Wont that also use mag to couple to ground?
Definitely a neat build so thank you for sharing this video. I'd be curious whether you could had made your irrigation pipe about 4 inches longer and built your SO 239, ground, and collar connection into the pipe and cutting the lower half of a cap and using that as a stop for the collar, then finish the base with the mount using another cap. The Wolf River Coil is $150 US now so your build would be less plus as you say there is the satisfaction of having built it yourself.
So i have a feeling this "trick" will help. Straighten the stainless wire by spinning it with the drill when it's stretched out. Two things should happen one it becomes straight the other is it will work harden and become less springy. This is a common technique for people that vape and make coils.
Yes this pipe is readily found in Australia but many of the commenters to my video are finding it hard to find in other countries. I have updated my video description with some other video links which present different methods of construction, so I hope that is helpful for you.
@@maddogshamradio3407 Just a heads up. My plumber buddy says he thinks he can cut the threads on some schedule 80 pipe. We’ll experiment and let ya know.
@@maddogshamradio3407 great thanks for the info just one question, I would like to have more details, do you prefer an email address because I do not know the number of turns nor the length of the support between the 2 plugs, or tell me, your proposal, 73 dear friend on3STA from belgium
What are you going to find that will be fit the 1/2 sticking out the top. Most of the things around are 3/8 -24! All the whips mounts are all 3/8 - 24! One idea I had was making one for the lower bands will need longer wire and pipe
Commercial whips are half inch (ie Codan radios). But I also have a 1/2 to 3/8 adapter which I use for my military whip. Yes with more coil you will get 160m band but the Q will be high and band width narrow, but definitely do-able!
Both of those coils are fantastic. I would love to know how long it would need to be and what size whip attacked to get 6 to 80 on one setup. Or if it was even possible.
Re. SO-239 at bottom. An alternative approach would be to have an RG-8X tethered cable permanently attached. Requires only a few solder connections, and the cable simply exits the assembly. Avoids the faffing with the SO-239, but still needs the banana socket. (Surprising that nobody will be demanding that you use a 'Power Pole' terminal instead of the banana socket, LOL !!)
Hi there! Amazing build! I’m doing one for myself but I have a question, not clear for me in the video - the bottom part of the coil also goes to ground right? Top to antenna, center pin to clip , and bottom coil to ground with the counterpoises?
The bottom part of the coil is not connected to anything. The outer shield of the coax is the only thing connected to the counterpoise. If you are doing a magnetic mount you could also connect that to the outer shield of the coax (I don’t as I rely on the counterpoise). Good luck with your build.
hi. Could you Use that Clamp with Wing Nut to Hold Wire down, while finish feeding wire end through pipe? ; ) Looks Fun to make. don't know antennas - was curious. NICE Work, i'd say.
Great build. I have question though. That clamp will contact about 5 windings at a time, and I have seen in the manual of the MFJ1622 antenna, that the clamp should only contact 1 winding. So does this broad clamp have any effect, like being less accurate in tuning? And another question: that threaded poly riser pipe seems to be available in Australia. Does anyone if I can get that piece of pipe here in the Netherlands, (Europe)?
It doesn’t matter weather you use a wide clamp or a narrow clamp, at the highest part of the clamp where the clamp has continuity with the upper section of coil is the effective position. With the poly risers the Australian resellers import them from China. In my initial video comments I have also recommended a couple of other builds that may be helpful. 73, Marty VK4KC
@@maddogshamradio3407 Thanks for your answer. I must say when I gave it a second thought later, I realized that it indeed does not matter how wide the clamp is, since part of the coil up to the upper edge of the clamp is shortened! 73!
Does it not matter that the hose clamp is contacting multiple turns of the coil wire? In other DIY coil builds, I see them clamping onto a single turn.
Very great construction, looks very solid and durable. Could you please tell me what the outside diameter incl. the stainless wire will be. I wonder what will be the right size of the hose clamp? I see Frithys Rural shop also selling these. I see in you video that you're using 1.6mm wire, I found many 1.5mm wire on eBay, I guess that will work, only 0.1mm difference. You just got yourself a new subscriber. Best 73's de LA3DNA Leif
A thousand thank yous for using the metric measurements. The nations that do not use metric need to get their heads out of their bum. Sell your, as of yet, not patented coils for $206
Very good video, useful and informative. Thanks. I'm not sure quite how to word my question. Does it not matter that the hose clip is making contact across multiple turns of the coil? Also, I think that this method could be used to make a coil for an antenna matching unit. Have you tried that?
I have not tried it as a match unit but it certainly could be with use of capacitors. All the coils that make contact with the hose clamp are effectively shorted with the clamp. The lower part of the coil in theory is a radiator but it will never be at the same tuning as the frequency that you are using so the RF energy will not radiate from that section. So it is only the coil turns above hose clamp that are being used to tune the antenna along with counterpoise length.
Hi George, I purchase mine through Frithys Rural in South Australia and I’m sure they get them from a supplier in China. Have a look at my written information for this video as I recommend in there some other construction projects that are similar. Best 73. Marty VK4KC
![Noob To Max With DRAGON REWORK In Blox Fruits [FULL MOVIE]](http://i.ytimg.com/vi/LnBMOinoOvA/mqdefault.jpg)
In the USA, the threaded poly pipe seem to be a rare product so I figured out that Lowes and similar stores that sell PVC and steel pipes will cut and thread any pipe you buy. They typically thread steel pipe but the same machine will easily cut threads into a PVC pipe. Simply buy a 1.5" schedule 40 pvc pipe and have it threaded as far as you need it.
Have you made one of these coils yet? How did the threading work out for you? Did you find any threaded end caps?
This video only having 13200 views (as I'm watching it) is a disgrace. This is an absolutely FANTASTIC build with everything explained PERFECTLY! This qualifies as ham radio ASMR. Brilliant, friend! Hope to see more like this!
Thank you very much for your most kind and encouraging comment. I will have a another video of the “lazy dog” antenna in about 3 weeks time.
Thats a stupid comment about it being a disgrace.
Is Ham radio and CB radio different or regeraded differently in Australia? Back in America / Canada I have been exposed to some of the same theory and electroincs. On the air i once heard that there are some more abnds and longer distances available with amateur radio. It was a short conversation in CB Radio?😀🗨🗨💥👩🎤🛀👤👩👧👦
@@RolandGirshman Yes, at least here in Australia, it's a big difference. CB, no licence needed, only two bands both short range except under just the right conditions. Whereas amateur radio, there's three licence levels, progressing from Foundation (easy) to Advanced (advanced!) but even the basic foundation gives you 6 bands that give enough options for good comms over 0 to 1000s of km, still depending on conditions a bit😀
I totally agree!
I’ve seen a lot of ham Radio builds on RUclips and I have to say this is one of the better ones. Very nice looking piece of equipment
@12:28 if you put the hose clamp on it will hold the wire from backing off on you tell you get it threaded in the hole... This is the best build video on this matter yet. Thank you.
You are correct. Another commenter suggested this to me and I have been using that method since. It works great. Thank you for your comment.
Very ingenious and well done. I tried to get a friend who had a pipe threader to thread some pvc pipe for me to make a form. Unfortunately he was afraid it would clog up his machine. I ended up with a Wolf River coil. I wish I had seen this all thread pipe. Never heard of it before. This kind of ingenuity is what ham radio is about. 73s
Wolf River Coils are nice. Mad Dog sells his too. I might buy one just to support his great efforts.
wow! 10:03 😍 awesome garden! 💜👍 love the lack-of-lawn, and how super fancy it looks!
The integrated feed point and female connection sockets for radials…outstanding. Well done Sir. I’ve deliberated over how to improve those shortcomings for a spell without a satisfactory result.
Thank you for sharing your ingenuity with the rest of the amateur community!
Thank you for you comment. I’m glad I was able to help out.
Absolutely a top notch presentation, the tutorial has left no stone unturned with a clear and precise explanation of every aspect of the build... Well done, its been a outright pleasure to watch and follow.
wow! I wish I would have found this one sooner on RUclips. after watching HOURS of other videos, the end result always looked like a kindergartner assembled it. yours on the other hand looks fantastic and like a commercial product! I think I will try to build yours with threaded PVC like a commenter suggested. about to start binge watching your other videos to see what else you've made!
also going to try he "magic carpet" ground plane to speed up the deploymnet and get rid of the radials.
I love the presentation, you showed us the way it really happens, and pointed out how to avoid problems. Well done.
Excellent video. I've wanted a coil for a while, and now I know I can build one!
Go for it!
I’ve seen a lot of ham radio builds on RUclips, and I’ve got to say this is one of the better ones. very nice looking piece of work
Hi Joseph, thank you very much. I appreciate it. Kind regards Marty VK4KC
Around 14:00, commercial products back in the day would often use a hollow bolt so that the wire could be simply slipped up inside the hollow bolt. The connection might be secured with a set-screw embedded in the hollow bolt. Saves assembly time: slip the wire in, finish the overall assembly, tighten the set screw. Also give a straight wire run from the coil up.
Yes that is certainly a good option and some of my friends have recently made the coil with.a PVC collar with a metal bolt on one side and a nylon bolt on the other to apply force.
I was sitting in the doctors office waiting on the wife and came across your video. I really enjoyed watching it. I subscribed and hope to see more good stuff. 73’s de KY4K
Thank you for watching. I appreciate your feedback.
Very well done. Looks a factory job!👏🇨🇮
Building this coil in Australia is probably worth while compared to buying the Wolf River Coil, considering the cost of postage nowadays. Thanks for for a great build video.
This video is a perfect example of why I watch RUclips. Great walkthrough and description. Thank you.
Waving at you from NW Georgia, USA
KD2MOT -Matt
Best build ever, I just finished one and it's looking so slick. Thanks Marty. My next one will be the jr mad dog.
I was wondering when someone was going to build a similar coil that didn't cost $100. Good on ya mate. I built an antenna a bit like that, but I just used a pool noodle slid over a piece of 3/4" PVC. The coil wound on the foam has very low dielectric loss, and the RF is blind, so it doesn't care how pretty the antenna is. It worked well on 40 meters.
Hi John, thanks for your comment. Great idea using the pool noodle. Ugly antennas are always special to the builder, I can attest to that!
@@maddogshamradio3407, interestingly the pool noodle has lower dielectric loss than just about anything else in the way of a coil form, and because it's soft foam my alligator clip, (crocodile clip in Oz?) can clip onto the coil anywhere it's optimum.
That’s a great home brew HF antenna, excellent production. I fortunately own a lathe and I use thick walled PVC tube and cut a thread using the lathe, made quite a few, I like the idea of the sliding clamp. Note my callsign, VK2KC!
Thank you for your comment. With that callsign we are definitely ham radio Brothers!
@@maddogshamradio3407 can you confirm that the sliding collar is a truck intake turbo hose clamp?
@@andrewjohnmclean5488 it is a EnduraSeal Stainless steel T-Bolt hose clamp. I have also used cheaper hose clamps and they work fine.
Tried to buy a clamp from the big hardware store, but they only had the larger sizes!😟
@@andrewjohnmclean5488 some of the Bunnings stores don’t carry the smaller ones. I had to get a worker to look up what stores had stoke of them.
Bloody brilliant 👏🏼 what a great concept and execution.
Thanks Scott. Tested it today in preparation for Dorrigo park fest. Tunes up well with a 4.5 metre counterpoise wire from the antenna draped over the front of the car.
Awesome detail on this build; thoroughly enjoyed it. Now its on my list of must do.
Glad you enjoyed it.
Absoutely AWESOME Marty! 👍 This is the best loading coil I have ever seen, and that includes the commercial ones. Thanks very much for sharing your idea. 🙂 The all-thread irrigation risers are a bit hard to find up here in Canada but if I can't find one, I will try printing one on my 3D printer.
Thank you for your encouraging comment. I see that the risers are still available on the Australian eBay store at this link. www.ebay.com.au/itm/294814307544?mkcid=16&mkevt=1&mkrid=705-154756-20017-0&ssspo=dkw15RJmR2W&sssrc=2349624&ssuid=ALpUZn3RQtu&var=&widget_ver=artemis&media=COPY
I like it. Ive been looking at mobile solutions for my truck, and this looks really convenient. And it looks fun to build. Thanks! 73
Thank you for your comment. Yes I really enjoy playing around with this stuff.
Great Job. Thanks for adding my Video.
Good job!! Looks really well-made. I ended up going with the Wolf River Coils though, considering the price and the effort. Probably very satisfying to see such a project completed, but I don't even have a bench to work on. The wife would have expressed her discontent at the sight of parts being spread out on the dining table. :)
Yes I know what your saying. I’m fortunate to have a good size workshop and yard. The WRC is a great coil along with the Slidewinder from M1ECC antennas.
Without doubt the best idea for home built variable loading coils. Thank you for this video! Rob, VK4SSE
Fantastic job!! 👍 Thanks for filming and sharing 73
Back around 1995 Don Johnson wrote a book on making the DK3 a screwdriver antenna, in the 90s I made 4 of them, making the coils out of pvc pipe threading at 10 turns per inch, on a metal lathe. we wound them on a metal lathe as well.
Thanks for sharing! You have done well!
I used 16 gauge buss wire which is solid copper wire tinned, One suggestion after you uncoil your stainless wire, I would give it a BIG tug just to straighten it out so maybe it will go on the coil better.. 73 kd8nv
Thank you for your comment and tips. That is very helpful. I will have to look into the Don Johnson book. 73, Marty VK4KC
If we could only get that pipe done up for a cheap price this would be great! I have a bud with a small lathe we might try turning some pipe and see how we get on. Great idea!
Good luck with the project. Please share how it goes for you.
That's a beauty, sir.
Thank you for your positive comment. I’m using it for POTA and BOTA activations. 73, Marty VK4KC
This is great.. I’m going to give it a shot.
Good luck with the build.
Nice! Clean design and great presentation.
Great video and presentation! Very nice build with a clean professional looking product, my hats off to you. Nothing like making something yourself, and maybe save a few bucks in the process too.
I watched it thoroughly to build one too. After hours or searching retail/industrial sites I discovered such a poly riser does not seem to exist outside Australia. Someone with a lathe (or local machine shop) could thread a piece of PVC pipe or such - the only possible alternative I've found thus far.
An Australian supplier (CONFIT) that ships to the USA is $31.92 per riser + $50 shipping + taxes + custom/import fees not counting the caps or other parts. Which makes it cheaper to buy a finished Wolf River coil ($86.09 shipped) than to even get one poly riser to the USA... bummer.
A group or club large quantity buy may get the costs of all the parts for about the same price of the finished WR coil (for any diehard kit builders).
Thank you for your comment. Yes there are certainly many ways to get the end result. There are a few other videos showing different methods and I have added those links at the end of this video description.
I was thinking maybe the guys at home Depot would thread a piece of PVC for me ! Idk it's worth a shot.
A fantastic, very professional - looking build. You could also, fairly easily, do something like WRC's 'Camera Tripod Adapter Plate' and have a universal setup that could go from a mag. mount to tripod in seconds.
Thanks for the video.
Thank you for your positive comment.
Well done mate, great build 👍
Thanks Hayden. I’ve been using it for most of my park activations the last few months and I’m very happy with it. I’m using the M1ECC militarily folding whip on top of it. Plus the G90 and 7 Amp/hr battery all fit in a small back pack which is quite lite.
Superb build
Thank you for your encouraging comment.
Thank you for the video that’s very nice I will try to make one of those see if I can find everything that I needed thank you again and keep up the good work
Excellent Work Mate !!! ⚡🙏⚡
Thank you for your encouraging comment.
Just bought one. Looks perfect for a mobile station.
Go Marty! Good stuff.. I have a WRC Silver bullet but I don't use it very often. Good easy to follow video. Great job.
Thanks Mate.
Brilliant. Good job there.
Thank you for your encouraging comment. Marty VK4KC
As you suggested, I did a google search for all thread risers. All of the responses had a .au url. So, except for Australia, unobtainium. Which is a shame. This is a great idea and very well made.
In my main video comments there are a few links to some other DIY coils. Check those out for ideas also.
This is absolutely fantastic. Amazing excellent build.
Hi John, thank you for your positive comment. Cheers Marty VK4KC
Good job Marty.
Good on you mate! Cheers from U.S.
VK4KC Marty, you've done an excellent job on both of your coil versions, outstanding, just shared with my radio fellows, thanks so much 4 sharing your great job ! XE2YWI Jacob
Jacob, Thank you for your comment and encouragement. Best 73 … Marty VK4KC
Nice mate !! Outstanding !. I'm making one. Good onya for posting
Good luck with you build. 73, Marty VK4KC
Good luck with your build. 73, Marty VK4KC
Very slick build. Do you have any idea how much wattage it will take? I need one that will hold at least 500 or so.
Excellent work!
Great video @maddogshamradio3407 similar poly pipe is available in the UK, however it is only threaded at the ends, not all the way through. Need to get it from Oz or China.
Thank you for your comment. Yes it looks like that is the case with regards to supply. I have linked to a couple of other videos in my initial video comments that you may find useful watching. Cheers Marty VK4KC
Super job mate. I've done a lot of research on this job and I'm able to do it thanks to you. Sending you love from Turkey. TA4DR 73
Thank you for your encouraging comment. Best 73. Marty VK4KC
Keep up the good work . Congrats !!
Nice job mate.
Thanks Stephen. I enjoyed checking out your QRZ page. Let me know if you want any info on POTA as I’m the Admin for Australia. The main thing I’m into is portable activating from parks around Australia.
Outstanding! Very good demonstration of the cold. I have one question: the second banana, plug, the one connected to the hose clamp. How is it connected inside the bottom clamp?
Cool. Thanks for sharing.
You’re most welcome
Have you thought about connecting the shield side of the SO-239 to the mounting bolt at the bottom to also use the vehicle as a ground plane through the magnet?
Great build video!
I should do that. I actually use this more on a tripod now for portable POTA rather than the vehicle as the vehicle now has a permanent radio and antenna installed.
That’s awesome!
nice building.
Thank you.
Fantastic work
Motters M7TRS 🇬🇧 73 👍🏻
Great job
Well done!
My compliment excellent Bill outstanding
Thank you for you encouraging comment.
I believe that your bolt is 3/8" or 9.525 mm with 24 pitch thread which is the standard size for those mounts.
Found my first antenna project.
Thank you for sharing this.
Incredible, it's look like a commercial model. I don't understand what kind of pipe you use to do the coil.
Hey mate, well done, where do u get the pvc pipe? can't find it in europe.
They are available from some irrigation stores in Australia. Those retailers import them from China.
Where do you get these all-thread riser pipes?
Many have tried to find this riser in America without any success. Peter from Frithys Rural in Australia has the 300mm riser and end caps. You can get the riser and two end caps for about US$20 plus shipping. Frithy’s Rural is on the Australia EBay store. Alternately look at the main text description of my video as I have links to two alternate builds which may be useful. 73, Marty VK4KC the Maddog!
now make a rotary dipole out of it! you'l be amazed how well it works at +_10m high, well built, bit expensive, but will last a long time, thumbs up.
Hi Marty, great to see some Australian content and a great description on an excellent build. Could you please give me some measurements of the radial/counterpoise wire/wires you are using for this antenna as you did on your video for the Mag Dog Coil Jnr. thanks in advance.
The radials are 4.5 metres long. I have 5 of them.
@@maddogshamradio3407 thanks Marty, I recently did a 3week trip from Brisbane through to Lightning Ridge And parts of Northern NSW. I found the antenna worked exceptionally well wherever I set it up during my travels. Thank you for the step by step build, keep up the good work.
At 16 minute mark, please explain the bottom of the cap? Since you went past for the boring part you said is important to know, we know the braid part gets attached to the coil, but what exactly is connected, ground and center conductor? Center tap of the UHF connector to the tap? What gets connected to which part? You briefly showed the base, i request a photo of the complete base prior to screwing the cap to the pipe, please? 73 de N2OBS
Great video, the hose clamp idea is spot on. I am making a coil also. My question is what readings I should have when completed and where would I read them on the coil, to see if the coil is working or have, I done something wrong. tx
Glad you liked the video. The measurement of the full coil is around the 100 micro-henries. Once you build the coil with the whip on top and counterpoise/ground wires in place you can use a antenna analyser to find the full frequency range as you slide the clamp from top to bottom. You can then mark on the coil the areas where the amateur radio bands are resonant. If you don’t have an antenna analyser many of the newer HF radios will give you a SWR reading for a particular frequency.
Nice. Thank you for this excellent video. 73
Thank you for your comment. I hope it helped in some way.
This is very interesting. Thank you but a note... What if you also tie the ground of the so239 to the bolt for the mag mount.. Wont that also use mag to couple to ground?
Nice project. Stainless steel wire is quite lossy at RF. That will increase bandwidth but reduce signal strength.
Yes definitely some losses there. 1 - 2 s points down compared to a copper wire dipole. Happy to accept those losses for the convenience.
@@maddogshamradio3407 silver plated copper wire is convenient and low loss.
Yes but sometimes you have to compromise,,thats the rough with the smooth,,but will do the job pretty well.
Definitely a neat build so thank you for sharing this video. I'd be curious whether you could had made your irrigation pipe about 4 inches longer and built your SO 239, ground, and collar connection into the pipe and cutting the lower half of a cap and using that as a stop for the collar, then finish the base with the mount using another cap. The Wolf River Coil is $150 US now so your build would be less plus as you say there is the satisfaction of having built it yourself.
Marty, I tested the Poly Riser and endcaps in the microwave at full power for one minute with a glass of water. No heating!
Hi Andrew, that is a great test, and thank you for sharing the results. Looks like we can pump some decent RF power around the risers.
So i have a feeling this "trick" will help.
Straighten the stainless wire by spinning it with the drill when it's stretched out. Two things should happen one it becomes straight the other is it will work harden and become less springy.
This is a common technique for people that vape and make coils.
Awesome
Se agradece las medidas en metros! 73
Clean, simple. Now if I can find the all threaded poly pipe.
Yes this pipe is readily found in Australia but many of the commenters to my video are finding it hard to find in other countries. I have updated my video description with some other video links which present different methods of construction, so I hope that is helpful for you.
@@maddogshamradio3407 Thank you, but I like this build so I’ll continue on my quest for the wild and illusive pipe from Down Under. 👍
@@maddogshamradio3407 Just a heads up. My plumber buddy says he thinks he can cut the threads on some schedule 80 pipe. We’ll experiment and let ya know.
hello dear 'om I find your assembly fantastic, can I ask you what is the max power that the coil little supported thank you 73 on3sta from belgium🤩👌
I have tested to 100w SSB, and 50w CW. It will most likely handle greater power levels than this but I have not had the need to go any higher.
@@maddogshamradio3407 great thanks for the info just one question,
I would like to have more details, do you prefer an email address because I do not know the number of turns nor the length of the support between the 2 plugs, or tell me, your proposal, 73 dear friend on3STA from belgium
What are you going to find that will be fit the 1/2 sticking out the top. Most of the things around are 3/8 -24! All the whips mounts are all 3/8 - 24! One idea I had was making one for the lower bands will need longer wire and pipe
Commercial whips are half inch (ie Codan radios). But I also have a 1/2 to 3/8 adapter which I use for my military whip. Yes with more coil you will get 160m band but the Q will be high and band width narrow, but definitely do-able!
Both of those coils are fantastic. I would love to know how long it would need to be and what size whip attacked to get 6 to 80 on one setup. Or if it was even possible.
I have read that having one end of the coil connected to ground makes a more efficient and higher Q antenna
Re. SO-239 at bottom. An alternative approach would be to have an RG-8X tethered cable permanently attached. Requires only a few solder connections, and the cable simply exits the assembly. Avoids the faffing with the SO-239, but still needs the banana socket. (Surprising that nobody will be demanding that you use a 'Power Pole' terminal instead of the banana socket, LOL !!)
Hi there! Amazing build! I’m doing one for myself but I have a question, not clear for me in the video - the bottom part of the coil also goes to ground right? Top to antenna, center pin to clip , and bottom coil to ground with the counterpoises?
The bottom part of the coil is not connected to anything. The outer shield of the coax is the only thing connected to the counterpoise. If you are doing a magnetic mount you could also connect that to the outer shield of the coax (I don’t as I rely on the counterpoise). Good luck with your build.
Very Cool.. Thanks for the video.. 73's
hi. Could you Use that Clamp with Wing Nut to Hold Wire down, while finish feeding wire end through pipe? ; )
Looks Fun to make. don't know antennas - was curious. NICE Work, i'd say.
Hi Karen, That is a great suggestion and would work really well. I wish I had thought of that! Thank you for commenting.
@@maddogshamradio3407 You're Quite welcome! Nice to hear it would work. perhaps next time. : }
Nice very informative video sir. Btw how many turns the coil have for the 40 meter band sir?
Thank you for your comment. 40 turns to tune 40 metres.
Great build. I have question though. That clamp will contact about 5 windings at a time, and I have seen in the manual of the MFJ1622 antenna, that the clamp should only contact 1 winding.
So does this broad clamp have any effect, like being less accurate in tuning?
And another question: that threaded poly riser pipe seems to be available in Australia. Does anyone if I can get that piece of pipe here in the Netherlands, (Europe)?
It doesn’t matter weather you use a wide clamp or a narrow clamp, at the highest part of the clamp where the clamp has continuity with the upper section of coil is the effective position. With the poly risers the Australian resellers import them from China. In my initial video comments I have also recommended a couple of other builds that may be helpful. 73, Marty VK4KC
@@maddogshamradio3407 Thanks for your answer. I must say when I gave it a second thought later, I realized that it indeed does not matter how wide the clamp is, since part of the coil up to the upper edge of the clamp is shortened! 73!
Does it not matter that the hose clamp is contacting multiple turns of the coil wire? In other DIY coil builds, I see them clamping onto a single turn.
Very great construction, looks very solid and durable. Could you please tell me what the outside diameter incl. the stainless wire will be. I wonder what will be the right size of the hose clamp? I see Frithys Rural shop also selling these. I see in you video that you're using 1.6mm wire, I found many 1.5mm wire on eBay, I guess that will work, only 0.1mm difference. You just got yourself a new subscriber. Best 73's de LA3DNA Leif
A thousand thank yous for using the metric measurements. The nations that do not use metric need to get their heads out of their bum. Sell your, as of yet, not patented coils for $206
Very good video, useful and informative. Thanks. I'm not sure quite how to word my question. Does it not matter that the hose clip is making contact across multiple turns of the coil? Also, I think that this method could be used to make a coil for an antenna matching unit. Have you tried that?
I have not tried it as a match unit but it certainly could be with use of capacitors. All the coils that make contact with the hose clamp are effectively shorted with the clamp. The lower part of the coil in theory is a radiator but it will never be at the same tuning as the frequency that you are using so the RF energy will not radiate from that section. So it is only the coil turns above hose clamp that are being used to tune the antenna along with counterpoise length.
@@maddogshamradio3407 Thanks for that. I've been experimenting with coils of late. Commercial roller inductors are hard to find and expensive. 73
Great vid. Thanks!
What about for CB radio? Is there a big difference in some peoples minds?
It can be tuned to CB 27mhz.
Hi I am in the UK and haven't been able to source the threaded pipe riser. Is it something just in your country. Cheers from old George
Hi George, I purchase mine through Frithys Rural in South Australia and I’m sure they get them from a supplier in China. Have a look at my written information for this video as I recommend in there some other construction projects that are similar. Best 73. Marty VK4KC
Amazing antenna! Have you calculated the inductance of the coil? Are there any losses factor associated with stainless steel wire?