[Elecraft] H mode mixer

[Giancarlo Moda]

Hi Julius,

--- J F <phriendly1 at yahoo.com> wrote:

> Hi Gian,
> 
> 
> > 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.
> 
> Perhaps I missed these, been reading more about
> antennas than Rx design, particularly if it was SDR.
> Mea Culpa here...

You should not feel bad ... there are many people that
missed articles ...hi You can read it in another time
...

> 
> > 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.
> 
> I know how this goes, still, if the need and demand
> was there, some fee seems better than not having a
> good product. Still, maybe it's because many
> equipment
> manufacturers, like many hams, are adverse to change
> at times...

It is not clear ... the design of a commercial Ham
equipment is finalized by the accountants and not the
engineers. Removing 50$ of components reduces the
product of 200$ ... for 1000 units they saved or
gained 200.000$ (I believe this second solution maybe
the right one ... 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.
> 
> I am aware of the STAR (had forgot about it) As I
> recall there were some personality issues that may
> have stunted growth or wider adoption. I could be
> wrong...

Yes... some issue but not "personality". The issue are
associated to the PCBs that the STAR homebrewer has to
make himself. I suggested to G3XJP to arrange for a
STAR PCBs kit... I have a friend that could manage
that (like done for the N2PK-VNA original kit).
G3XJP was clear on this point and then I understood
why he was and still contrary ....
The STAR project is not for everyone that may know how
to keep a soldering iron on his hand. You need
knowledge of hdw and sw ... imagine 500 kit are sold
out .... some of the buyers will never complete the
STAR ... some will make it and have it running as
expected .. some others may do some wrong assy ...
Star will not work ... there would be two reactions
from these users:

1) An unnecessary overload for G3XJP to help fixing
the problems ... but not due to the project, and he
would be right to refuse support

2) Upset people talking badly about STAR Project, his
designer (G3XJP), who would haved produced the PCB kit
and who else...

I agreed on Peter's decision of no commercially
produced PCB. If aq group of hams would like to make a
commercila like PCB kit for each member I believe
there would not bee any problem if there would be a
group support and in case of genuine problems only one
of the groupo wwould interface with G3XJP ... maybe I
am wrong on this too.
 
> > 
> > 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.... (????)
> 
> Actually, I've read IK4AUY's article(s) with much
> interest. QEX is not as widely read as say QST or
> CQ.

Yes, this is the main problem. Only fiddlers would
extend their membership to receive QEX

> These days those types of articles are considered
> too
> specialized for the mainstream. We could use a
> publication like "Ham Radio" again. 

You are right on both. I have missed HamRadio .. it
died when it was sold to 73 ... a no technology
booklet...


It is rare to
> see
> a RadCom at any but the large hamfests. That seems
> to
> keep technical and non-technical in the same rag,
> versus the segmenting that is so popular here.

RadCom for me is the best Ham magazine. There are
inetersting articles although some times RSGB has
similar problems as other Radio Societies...
One of the best column in RadCom is Technical Topiocs
manage by Pat Hawker, G3VA, where you have a world
wide share of knowledge.
I would suggest people should ask their own Radio Club
to pay for a membership to RSGB and all the members
would benefit from it.... same from their own town
library.


> 
> I might consider modifying one of my K2s (assuming I
> don't sell one off for the K3!). It will be
> interesting to see how this morphs.

Yes, you should consider to modify one of your K2s ...
you should not be afraid ... and I have the legal
protection of one of your local advocates ... your
wife ... hi

> H-mode and tinkering forever ;o)

GOOD !!!!

> Ciao bello!

Thanks ... it would have been a better comment from a
YL ... hi... did you look at my picture?

Ciao

Gian
I7SWX

> 
> Julius
> n2wn
> 



       
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