[Elecraft] phase detector for tuning magnetic loop

[G4ILO]

ub5_073_oleg wrote:
> 
> 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
> 
> 
About a year ago I came across a site containing a full description of a PIC
based automatic tuner for the MFJ magnetic loop. I think it was a US ham's
site. But I didn't bookmark it and I have never been able to find it again.
Perhaps someone knows where it is.

-----
Julian, G4ILO  K3 s/n: 222 K2 s/n: 392
G4ILO's Shack: www.g4ilo.com
Zerobeat Ham Forums: www.zerobeat.net/smf
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