Tom,

You posted earlier "Why would anyone use MoM if there were a set of
symbolic equations that would work just as well?"

We now have a situation where MoM (EZNEC) and a set of symbolic
equations (Corum method) are predicting very similar SRFs.

"Verbal sparring" about measurement methods aside, I think it's
important to try to understand what's causing the differences between
the EZNEC/Corum value and the measured value. Of course it's possible
that EZNEC is in error, but it seems odd to me that the Corum value
(derived by a completely unrelated technique) would also produce the
same erroneous value.

My EZNEC model had the coil 12" above Real Mininec ground, and
connected to ground via a 12" vertical wire with the source in it. I
simply looked for the frequency at which the source impedance was
purely resistive. The SRF was relatively insensitive to the height of
the coil above ground, and changing the ground type made no
difference.

I wonder if that model is anything like your own test set-up, and if
not whether the differences could explain the different SRFs we're
seeing.

73,
Steve G3TXQ