Actually, I believe that the circuit for the Millen 90801 exciter is,
in fact, in the December, 1952 issue of QST. The reason that you
didn't find it, is because the the circuit is used in a complete novice
transmitter project by George Grammer called, "75 Watts with an Economy
Power Supply." This transmitter is one of the earliest applications of
the then brand new RCA 6146 to appear in QST. It features plug-in
coils with a link coupled output and inductive neutralization. In the
Millen exciter they use a band switching arrangement but the circuit is
electrically the same. Perhaps someone else on the list can confirm
that.
About five years ago I was fortunate enough to acquire a very well
executed version of the transmitter described in the QST article. I
built a web page describing it here:
http://home.comcast.net/~acohen788/
Interestingly, I have since added a couple of other George Grammer
designs to my collection. When I have the time I'll snap some pictures
and add them to the page.
Alan
WA2DZL
On Jan 2, 2005, at 7:36 PM, WD5JWY wrote:
Gentlemen:
I'm looking for a Millen 90801 HF Exciter in reasonable condition. I
would
prefer one that is in operating condition, however I would consider
offers
on units in any shape.
Also, if anyone has detailed technical drawings or high-quality digital
photos of the 90801, I would appreciate the information. Since these
units
are so rare, I'm thinking of attempting to duplicate the unit as
closely as
possible, but I would need the above technical data to do so. This
unit was
supposedly described in the December 1952 issue of QST, however I
cannot
find it in that issue.
I'm also interested in the following units as well:
Millen 90831 40W Modulator
Millen 90281 HV Power Supply
73
de, WD5JWY
Dennis Pharr
Oklahoma City
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