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If you read this forum thread: www.eevblog.com/forum/rf-microwave/correctly-calculating-impedance-of-a-biconical-antenna-and-impedance-matching/new/?topicseen#new , you will see I have followed a long path to get to this point. What I call a "linear ferrite balun" (LFB) could be called many other names, but I haven't found a common one. This LFB easily out performs the other baluns I have tried but I have not found quantative repeatable test results for the LFB. Nor have I found similar examples of the test fixtures I built. I don't believe for a moment that no one else has made similar test fixtures. I just can't find references to them. I've done some more experiments that I will post when I have time to make the videos.

I don't have the gear to braze. I do have a MIG welder but no requirement to weld printer machine rods.

It's leaded steel, free machining steel. That's why it's so nice to turn and mill. I've used it alot. Don't weld. Silver brazing works good :)

It is an American thread : 1/8" 40TPI, 55 degrees. I have a good stock of BA but thanks for the offer.

It is still running perfectly. I am currently using the lathe to make 1/8" 40TPI set screws. The very low speed makes it easy to turn a thread right up to a shoulder.

If you buy a parts scope, you won't know if the part you need is working. I was going to say just buy another HP54645D off e-bay but I just had a look and the prices are stupid. For that amount of money, it would make more sense to buy a new 200MHz 14bit Siglent or similar.

I used standard 50R coax but at 500MHz the input capacitance of the scope has an impedance of only 24R, so the value of the resistors in the terminators becomes almost irrelevant. I do have a pair of 50R terminators, but they significantly reduced the signal voltage seen by the scope. Experimental results with the calibration balun showed that it didn't matter what the impedance was, as long as it was the same for both scope ports. I did not attempt to compensate the terminators in the way scope probes do because I would then have been faced with the problem of balancing the terminators. When I started, I had no idea the scope would still provide a (barely) useful display at 500MHz. Ideally I would have used the differential probe I don't own but this very basic vna got the job done. How do others test baluns?

If you follow the eevblog forum thread here: www.eevblog.com/forum/rf-microwave/correctly-calculating-impedance-of-a-biconical-antenna-and-impedance-matching/msg5155014/#msg5155014 you will see a fixture I developed to measure common mode rejection by a toroid based balun. This completely failed when testing the linear balun because the balun plus the cable to get back to the fixture formed something like a loop antenna. The frequency response of the loop dominated the results. Even squeezing the loop flat with cable ties did not fix that. So if coiling up the coax helps in HF, it wrecks the VHF/UHF response. What I call the linear ferrite balun does not appear to have a self-resonant frequency ( within the limits of my vintage test equipment) that I saw with coils over a toroid,. I'd be really interested to see these tests replicated by someone else with more capable instruments.

No I didn't need to change any parts. For parts, try the fb group: SOLARI di Udine

@@darrenconway8117 - Many thanks for getting back to me. I will give that a try.

Look at the position of the snail cams that are at the top of the shafts holding the flags.

@@darrenconway8117 Thanks, have to release flags some way, maybe opening a screw on top (?).

I don't know.

Hi. I used an industrial grade ABB ACS50 VFD. This is a basic device but adequate for this application. If you can afford it, I would strongly recommend getting an industrial vfd, and not a consumer grade version. If I did this conversion again, I would make a larger diameter driven pulley. That would increase the torque and reduce the top rpm. Alternatively, I would make a two ratio pulley to give the option of high torque or high rpm.

Grazie per il vostro interesse. Posso comprare solo carrelli fatti male qui.

Midnight in 24 hour clock: 0:00 and 24:00

I just coil up the cords and hang them over the respective grinder, or lay the coils in the bottom tray.

There is a table inside the side door that provides a guide for amps/volts. for work thickness and wire dia. Changing one of the dials changes the settings on the other. They are quite close to what is needed but easily adjusted to suit the job.

The 2T/4T feature is where the welder can choose to weld in: 2T Mode Press the gun/torch trigger to weld and release to stop. or 4T Mode Press and release the gun/torch trigger to start, weld without holding the trigger on and stop by pressing and releasing the trigger again. This is particularly useful when doing long weld runs. If you are blowing holes with TIG welding, it is likely you are using too much heat. I suggest you enroll for a welding course. It is a quick way of understanding the basics.

Yes I am.

No mate, I'm a Kiwi ! I'm far too intelligent and modest to be an Aussie !! I do have to give you credit for recognising good design !!!

The bracket that bolts to the chassis would probably need to be custom made and fitted for each chassis. That would make it expensive. The sheet metal for all parts was hand beaten and shaped. The cost of the time to do that would make these parts stupidly expensive. Yes I have considered selling these, but only for a moment. Do you want one?

The welder is still working like new. I'd say still a good buy.

@@darrenconway8117 ok awsome thanks. Il go pick one up this week then. Then do a review on it lol

@@darrenconway8117 I have the 250 cart welder 3 in 1 and it works awsome too

Just use bigger wider wheees.

@@darrenconway8117 haha you've got something there! Tracks even

Hi I understand there is a version of my clock that includes a pulse generator. My clock needs a master clock. I use a Synchronome master clock, but this only produces single polarity pulses. I am currently writing software for a Arduino Uno and H-bridge motor drier shield to produce double polarity pulses. This will take the pulses from the Synchronome and produce pules for the normal slave clocks I have, plus pulses for the Solari Cifra 12. This is a mix of old and new technology. I could add a Real Time Clock module to the Arduino to make it a master so I didn't need the Synchronome, but I haven't done that.

My Cifra 12 requires a separate master clock. The master clock provides one pulse every minute. The pulse voltage varies with the clock. Mine requires 48VDC. The pulse polarity has to alternate. One pulse is + / - and the next is - /+ . For the video, I use a switch to produce pulses (no master clock). The switch produces alternating voltage pulses.

​@@darrenconway8117 Thank you very much for your response. I was reading a lot about the cifra 12 and discovered what you tell me!!! thank you again!!1

It is legal under the rules where I race.

I have only used 0.8mm solid wire with gas. Never had a problem that I could blame on the welder. I suggest you make contact with the designer through this website: www.esseti.co.nz/

The cable holders are not welded to the main shell. What you don't see at 2:15 are the screw holes in the plate. 3 screws hold the cable holders onto the side of the drawers. You can see the screws at 2:30.

Sorry I don't know. I suggest asking the question at this website: www.esseti.co.nz/

I look forward to seeing your design.

Спасибо

Hi. Thanks for the feedback. I am using Argon 90%, CO2 10%. Good for MIG. Not good for TIG. My opinion hasn't changed and I have no regrets. If you want to avoid/delay buying a gas bottle, this welder works well as a stick welder as long as you control the arc blow (as seen in the video). The cart has continued to do the job for me. I studied a lot of other carts before building my own. I picked out the best ideas and added some of my own. As a result, I have not seen another cart design that better suits my requirements. You may have different needs. Welder technology has changed a lot in 30 years. I think you will notice a bid difference.

@@darrenconway8117 Thanks Darren - as soon as I can get out and into town I think I'm going to order one. The April/May Tradezone flyer has them advertised at NZ$1649 incl., and then there is gas and wire on top, and a new mask. Not going to get any change from 2k I think. But hey ho. The eventual goal is TIG because it looks so damn cool but MIG sticks stuff together just as well. And of course, I just have to build a cart ...

How did your session go?

Hi Darren. It was great fun; having done karts myself these cars are, after all, fat karts! After the briefing they put us straight into the F3000 cars for a very slow sighting lap then a quicker warm up lap, then into it. Putting it politely there was a vast range of driving skills in my session but the trainers soon worked out who was quick and who wasn't so quick. They promptly shuffled the cars around accordingly by pitlane drive-throughs so I never felt I was being held up. They couldn't retrieve my onboard video so I was allowed to go out on my own (well, just me and a trainer in another car) for an extra 3 or 4 laps so I could get a video. Because I had time to process in my head what I did right and wrong the first time I nailed it the second time and hit 191kmh twice on the straight. Apart from the technical glitch with the video I thought it was well run and lots of fun. $850AUD is a lot for 20 minutes track time but worth it for me because it will be once in a lifetime.

@@eoin1959 Given that every driver has access to a massively expensive first class track and a range of race vehicles, I think it is good value for the $$$. I spend about half of that at a kart club day.

@@darrenconway8117 I did say it was worth it and well run. Some of the other drives there are double that. No thumb drives anymore; they email you a link to the video which was all good.

Unfortunately I am not yet retired and have too little time to develop new skills yet. I have tried TIG and I like it but I don't yet need it. At least the Razorweld reduces the barrier to adding TIG capability.