[Elecraft] phase detector for tuning magnetic loop

[ub5_073_oleg]

Hi,

I'm thinking about building an automatic tuning controller
for my magloop. It could search for a current max, but this
can be a challenging task.

It's probably easier to look for a capacitor position where
the phase between voltage and current  crosses the 0, with
reasonable deadband for stability. This is probably easier
to find than a current max.

What I'm looking for is a working example, since my
experience is not enough to design the whole from scratch.

I found already some commercial devices:
http://wimo.de/magnetische-loop-antennen_d.html
http://q-mac.ru/en/qmac_mx9027.html

Joe K3JLS is working on MLC, too (was
www.k3jls.com/mlc.html, should be put live when Joe's
project is ready)

A nice newsgroup conversation on the same subject:
http://newsgroups.derkeiler.com/Archive/Rec/rec.radio.amateur.antenna/2005-10/msg00268.html

Does anybody here use an automatic, phase detector based
magloop tuner?

73! Oleg DL2IPU