If you're going to be doing the math anyway, analog or digital, and
providing some sort of calibration mechanism, you don't need to get too
weird about the directional coupler. For HF anyway, almost any old thing
will work. It sort of seems a little like black magic. Just stick a couple
chunks of wire next to a section of coax with the braid removed and all of a
sudden a directional coupler. I think the toriod based couplers are a
little more reproduceable, though.

Somebody, maybe even AD, has an RF power chip, too. Not sure of the
specifics of it. Might not be too useful for an analog circuit. A lot of
the cool chips these days are little bitty thing with lots of legs that you
can't hardly see.

...

"MAc" wrote in message
...
Dave Platt napisa³(a):

Build two direction couplers, as suggested above, but without the
rectifier diodes. [cut...]

Many many thanks. I'll go this way.

Best
73
MAc
sp9mrn