Hi Julius and Geoff and all.....
Thanks again for your notes. I hope to be clear on all
of them.
I will reply to both Geoff and Julius notes and these
will match Geoff comments/questions (I hope).
--- Geoffrey Mackenzie-Kennedy
<[EMAIL PROTECTED]> wrote:
> 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.
NO, that is not an H-Mode Mixer althought it was a
simple switched single balanced demodulator using
CD4066.
> 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.
The H-Mode Mixer (3 transformers) using both SD5000
and FST3125, referred to the TRIAD (W7AAZ, W4ZCB and
G3SBI) is reported in the ARRL Book EMRF Design.
>
> 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?
Good to know you are an "advocate" ... I may have to
use your services if some friends may blow-up their
equipments when volunteering on Mixers mods...hi
The answer maybe simple... see below
> > 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?
Intellectual rights on the H-Mode Mixer belong to
Colin Horrabin, G3SBI, and manufacturers do not like
to pay some extra $$$$ or ££££ or (Euro) ... or
maybe they try not to use someone else "brain
products" ... I guess ... hi.
The H-Mode Mixer has been used in two important
European Designs, as already mentioned, CDG2000 (G3SBI
part of the team) and Pic-A-Star or STAR by G3XJP. In
both designs you will see the "presence" of Bill,
W7AAZ and Harold, W4ZCB, particularly in the STAR.
Many European homebrewer designs have included the
H-Mode mixer in both 3T and 2T configurations. A
couple of projects are also been undertaken in JA-land
(see JA9TTT webpage).
Also several mods to commercial equipment have been
undertaken mainly in Europe and a couple in W-land.
When I published the I7SWX 2T H-Moder Mixer
configuration, LZ1OV produced the PCBs and if I do
recall over 200 pieces were sold all over Europe and
some in W-land and JA.
Why the H-Mode Mixer is not so well known in W-Land?
this is a question people may ask --- maybe is due to
the fact that QST is OK to publish NE602 projects and
less available to just a little more complex ones.
An article on the H-Mode Mixer was published in QEX by
IK4AUY ... but I am sure it did not "wake-up" the
interest in too many readers.... (????)
Have a nice weekend and up with the H-Mode Mixer ...
hi
73
Gian
I7SWX
> >
> > Cheers,
> >
> > Julius
> > n2wn
>
>
>
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