Hi Julius,
It might have something to do with Intellectual Title, but not being well
versed in such matters I could well be wrong. I have read very recently that
the H-Mode is being used in a new receiver for military use, and I know that
Rhode & Schwarz use a very similar mixer in one of their "Professional"
receivers designed during the mid or late 1990s - I would have to look up
the model. Perhaps the differences in the R&S mixer are sufficient to
prevent legal problems. I have asked myself the same question as yours
because the original H-Mode design appeared at least 15 years ago and has
been "maturing" ever since, and without any doubt is a high class performer.
In the European amateur press the H-Mode has received good coverage which
includes the publication of rceiver designs in which the mixer is used. The
ARRL Hanbook 2001 includes a description of the "Triad" receiver, a relative
of the receiver in the CDG2000, the latter was offered as a kit if memory
serves me right.
73,
Geoff
GM4ESD
Julius N2WN wrote:
Geoff & Gian,
To play devil's advocate (I'm decent in this role), if
the H-mode mixers is as simple and as effective as you
both suggest. Why hasn't it been more widely adopted?
For the most part, I've seen a couple mixers boards
and mostly references to homebrew building, but
nothing in the way of kits or commercially offered
radios.
Considering how difficult the 40M situation is in
Europe, and how large the ham population is, certainly
one would think that someone would have championed the
technology by now...
Any thoughts on this?
Cheers,
Julius
n2wn
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