Robert McGwier wrote:
> Bill Dumke wrote:
>
>> Art,
>>
>> Sounds like we might be comparing apples and oranges here.
>>
>> The SDR-1000 is traditional Tayloe. The SoftRock versions, so far, are
>> not
>>
>>
>
> The SDR-1000 is a not a PRIOR-ART detector. It is a version of the Van
> Gras detector which D.H. van Gras published in QEX in 1990 on page 7-10
> in the September issue NINE YEARS before the Prior-Art detector was
> published (1999). The prior-art detector is old old old. It has been
> published so many times it is not funny. We really do need to REFUSE to
> call this what it is not. Motorola holds the INCORRECTLY granted patent
> on this mixer. It is yet another living testimonial to what has gone
> wrong with the patent office. They did NO investigation whatsoever on
> the patentable claims with anyone who can have done a modicum of search
> for prior art.
>
>
Let me give one of my all time favorite examples. Back in the middle
ages, before the Italians and the Dutch began the Renaissance, Tom
Clark, (K3IO, ex-W3IWI) was a graduate student in radio astronomy at U.
Colorado and I was a mere gleam in my father's eye (we didn't even have
Leyden jar electricity that was so long ago ;-) ).
Tom needed a commutating capacitor mixer (cum filter bank) in a system
to do detection of his own echo off the moon. He arranged for a rotary
switch and bank of capacitors to be synchronous (or nearly so) and did
detection of his own echo's off the moon using this switched capacitor
filter bank and mixer by figuring out on which phase the capacitor
should have the largest voltage if he were really hearing his own 2
meter echo. He continued this synchronous operation until he had a
statistically significant detection of his own echo. (Tom, do I still
have a bed to sleep in next week? ;-) ).
Bob
--
AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,
NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman
Laziness is the number one inspiration for ingenuity. Guilty as charged!
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