![]() Parabolic dish microwave antenna with what appeared to be a variable directivity pattern Karlson US 2586827 “Directive Radiating System” Filed Maa KARLSON AND KARLSON-RELATED SPEAKER PATENTS One excellent audio example of that waveguide X15 speaker which employed a similar slotted waveguide. Karlson's Open End Waveguide Antenna patent 1968 - this was concurent with Karlson's ![]() Here's an early V-notch antenna - the so called Vivaldi antenna is credited to Peter Gibson in 1978 Karlson's antenna reference seems missing - the late Wayne Green says he gave the idea to Karlson to make a speaker using the principles. Karlson, leading radar systems engineer, microwave specialist and inventor of a widely used Navy antenna" Wayne Green had a falling out with Karlson but did say John had invented an antenna upon which things were based) There's a missing patent - or something was made possibly by Sperry without giving direct credit to Karlson. (Steve Schell part of Cogent will attest - lol) The original Karlson K15, finalized in the summer of 1951 is superior in ways to horns for its bulk and use as a wide bandwidth reproducer. Towline is alive and working in film and tv), Karlson described K15 basically as a coupled cavity type with improved matching and dispersion characteristics.ġ964 radio show with John Karlson - his K15 cabinet was used extensively by the Ford, GE, Disney In his 1964 radio appearance on HiFi Workbench hosted by Eric Towline (Mr. Karlson's first microwave antenna patent of the 1940's was a variable beamwidth type of conventional parabolic design. It could have related to a whistle or perhaps a cut in an organ pipe - ? maybe he saw or had one of those nozzles? Good question and cool old patent! - we'll have to dig deeper - if its possible at this point in time. If one choses to read the whole two page patent, it can be found at It's free to join! Just enter the patent number under search. I'll post the patent image for you to come to your own conclusion, and please note the date on the patent. So my question is, what was the real inspiration behind the Karlson Coupler? Could John Karlson have stumbled onto the the same patent I did? Now, I have visited some of the most popular Karlson forums, and have read a few long winded theories about how the tube was designed that actually make acoustical sense, some of which I have repeated and demonstrated to my colleagues, but a search of three Karlson patents revealed that the patent number for the nozzle never appeared in any of them. The image and description of it's operation bore a striking resemblance to the Karlson Coupler. One device that I found most interesting, was a water nozzle. LoL! I won't go into the rest, as most of them are even more preposterous too mention. One of all things, was a contraption that used centrifugal force to assist in delivering a baby. patent listings for anything and everything I could find that was audio related, I came across many other interesting unrelated patents. Many years ago while I was searching U.S.
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