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#1
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Looking for roller inductors
I stumbled across a few at surplus outlets, I'll see if I can dig up
URL's. $50 to $150 USD, depending on KW rating. You can build your own fairly simple though, for a lot less :-) -- Gregg t3h g33k "Ratings are for transistors....tubes have guidelines" http://geek.scorpiorising.ca |
#2
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Try: http://orenelliottproducts.com/variable.htm -- Never bought any...Good Luck... K2RK
ON5MJ wrote: Hello there, Is this kind of inductors still for sale or still build ? I would like to buy two identical roller inductors of about 20 to 30 µH for an antenna tuner. Does somebody know where I can buy them. In the US or in Europe, no matter. 73 de ON5MJ - Jacques. |
#3
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"Gregg" wrote in message news:t4eld.149312$df2.42254@edtnps89... I stumbled across a few at surplus outlets, I'll see if I can dig up URL's. $50 to $150 USD, depending on KW rating. You can build your own fairly simple though, for a lot less :-) -- Gregg t3h g33k "Ratings are for transistors....tubes have guidelines" http://geek.scorpiorising.ca Wup! Wade-a-minit! You can't go away without telling us how to build our own fairly simply for a lot less. Please. John KD5YI |
#4
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John Smith wrote:
"Gregg" wrote in message news:t4eld.149312$df2.42254@edtnps89... I stumbled across a few at surplus outlets, I'll see if I can dig up URL's. $50 to $150 USD, depending on KW rating. You can build your own fairly simple though, for a lot less :-) -- Gregg t3h g33k "Ratings are for transistors....tubes have guidelines" http://geek.scorpiorising.ca Wup! Wade-a-minit! You can't go away without telling us how to build our own fairly simply for a lot less. Please. John KD5YI Indeed -- directions or a URL. Please oh please. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com |
#5
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LOL! OK, ;-)
Delrin rod, Acrylic pipe/rod, PVC plumbing (not to be used for VHF), is key to the project. There are many pubs out there on making variable capacitors, the ARRL Radio Amateur's Handbook, and lots on the net. This is important, because the body is basically the same - rods, two square blocks of plexi or other insulator material, feed through hardware. The difference though, is you can use three threaded rods, but one must be smooth. Use a 1/8" brass hobby rod, threaded at the ends. You'll need a die & handle for that. Wind your rod. 14AWG house wiring is what I used. wind a spiral with one end ending in a near-complete circle. This will be the "common" connection. Your slider. Use a nylon bushing. This will be needed for friction. Electrical will be less important, because there will be no potential difference. Make a brass tab and dremel a notch in one end that'll fit the diameter of the wire used. The end of the tab should be bent back on itself a bit, to reduce binding. The other end of the tab, drill a small hole and attach to the nylon bushing with a 2-56 screw. Solder a flexible wire, litz, or that stuff used on speaker cones, from the tab to the end of the slider rod. Your common. Same tab, only soldered directly to one of the other, probably threaded rods. The tab will touch the end of the roller you made the complete circle of wire. Assembly. Same hardware for making a varicap, only instead of where the plates go, place your roller. I should really make a drawing ;-) -- Gregg t3h g33k "Ratings are for transistors....tubes have guidelines" http://geek.scorpiorising.ca |
#6
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"Gregg" wrote in message news:5cAld.151301$df2.57508@edtnps89... LOL! OK, ;-) Delrin rod, Acrylic pipe/rod, PVC plumbing (not to be used for VHF), is key to the project. There are many pubs out there on making variable capacitors, the ARRL Radio Amateur's Handbook, and lots on the net. There are? In the Handbook? Hmmmm. Okay, thanks. John |
#7
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Is this kind of inductors still for sale or still build ? I would like to
buy two identical roller inductors of about 20 to 30 µH for an antenna tuner. Does somebody know where I can buy them. In the US or in Europe, no matter. 73 de ON5MJ - Jacques. ====================================== These roller inductors can often be found at ham flea markets . Residing in Belgium you might have an opportunity to visit some of the many flea markets in the Netherlands . There is a really big one in March every year at Rosmalen near 's Hertogenbosch. Another one is the open air ham flea market at the 'Lichtmis' trucker's stop between Zwolle and Meppel (last Saturday of September). I have seen roller inductors for sale at any ham flea market in NL ,also new ones . Good Luck Frank GM0CSZ / KN6WH |
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