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

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.

"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

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

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

"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

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