Reg Edwards wrote:

Ian White wrote
I see your point... but what do you actually tune for, when you do
it manually?

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Frequency is selected by the receiver, not the transmitter.

The transmitter is OFF when I do it manually and I tune for maximum
noise in the receiver. How do YOU do it? smiley

I freely admit, I've never touched the things... just trying to be
helpful :-)

But what do you think "maximum noise" means? You hope it's going to mean
maximum field strength when you come to transmit, but what does that
actually mean in terms of loop tuning conditions?


If I can't do it when the transmitter is ON then neither can an
automatic ATU. It would have to be more clever than I am.

If we're not clever enough to build an automatic ATU for a magloop, it's
a sign that there's something about magloops we still need to know...
not abandon the idea.

First of all, somebody needs to build a phase detector for an existing
manually tuned loop, and see what results it gives.


--
73 from Ian G/GM3SEK 'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.co.uk/g3sek