The bifilar pancake coil at its resonant frequency

[Dog-One]

Below is a pix of some of the various coil arrangements I have used that all yield COP>1 except for one, that is the coil in the upper right hand corner.  Most are made with ribbon cable and the one sandwiched between the plexiglass is 3x 25 turns of 26 awg magnet wire and has produced >30 watts out in a 51 ohm load when driven with resonance on the input.

So ribbon cable not so good.  Bummer.

Okay then, if I can draw up some nice PCB coils and submit them to OSH Park,
anyone can buy them direct from there and test to their hearts content.

Who is game for that?


Playing with Fusion 360, it is fairly easy to generate a spiral coil.  I'm able to export
it, make a DXF conversion and pull it into DipTrace.  So this looks very practical.

[Jimboot]

Nope
Two mens opinion.

I agree 100% Chet.


Brad

3 and I would add just attack the data not the messenger. I loved that about MarkE. 

[Grumage]

Hello All.

For something " quick and dirty " what about Copper " Slug repellent " tape?

It comes in various lengths and widths with a non stick paper backing, any type of " bi, tri or quad " configuration could be tried fairly easily.

Just a thought....

Oh Poynt99 has also suggested coaxial cable. L1 being the centre core and L2 the braid.

Cheers Graham.

[Dog-One]

Hello All.

For something " quick and dirty " what about Copper " Slug repellent " tape?

It comes in various lengths and widths with a non stick paper backing, any type of " bi, tri or quad " configuration could be tried fairly easily.

Just a thought....

Oh Poynt99 has also suggested coaxial cable. L1 being the centre core and L2 the braid.

Cheers Graham.

Don't think coax cable will work.  Tried a bunch of that.  But PCBs...   Yeah, that's the ticket.

You guys jump in with some specs and I'll design'm, post'm and you can play with'm.

[Jimboot]

I'm on board Matt (pun intended) My understanding was high impedance, more turns will get desired effect at a lower frequency, so more accessible.