[Antennas] Antenna-Related Patents

Wed Oct 15 13:11:37 EDT 2008

>> I think this patent, as narrowly construed, could hold up. Although
> binocular cores are common, all the ones I have seen are tiny ones
> for receiving. And using them for transmit is not obvious to the
> average engineer. (If it were obvious, people would be doing it).
> It is fairly easy to get around the patent, such as with the baluns K9YC
> talks about. I suspect they are even better than the binocular
> core ones in the patent. Also, I don't know where you would get
> large binocular cores. Maybe Tom paid for tooling to make them.
> It costs several 1000ドル to make the tooling.
>
 Binocular core assemblies intended for use as baluns for power levels up
to 1KW are readily available from Communications Concepts and at least one
other commercial vendor. Design engineers who are involved with power
amplifiers and antennas are fully aware of these, and they were described in
all of the Granberg/Dye Motorola application notes for HF/VHF power
amplifiers as much as 30 years ago.
Chris
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