On Thu, 27 Nov 2014 11:20:38 -0700, Jim Thompson
wrote:

On Sun, 12 Oct 2014 12:45:29 -0700, Jim Thompson
wrote:

I need a SWAG on this, just to see if it's feasible...

Two inductors (solenoids) with Ferrite cores, each ~5mm in diameter
and separated by ~5mm spacing.

What coupling coefficient might I expect?

(Essentially no load on the "receiving" inductor except natural
losses... and I could tune or not.)

...Jim Thompson

Customer built a PCB and is getting good data coupling out to 2"
spacing.

Both ends are tuned with Q~10, so I'm going to cut it back a bit, I
fear cross-talk issues when he implements multi-channels.

...Jim Thompson

Can he put alternate channels on the opposite side of the board?
Or maybe a EMI shielding enclosure, might cause a change in the
inductance of the coil a bit.

Cheers