I remember reading some while ago that LLL was working with fast switching = transistors which generated "radar wavelength" signals. Then, as events go,= a Georgia Tech Prof. raised a stink since he had previously developed thos= e applications. Again, a vague memory. Does anyone recall this? TIA JB
Radar generating transistor circuit?
Started by ●February 7, 2014
Reply by ●February 7, 20142014-02-07
On Fri, 7 Feb 2014 05:09:02 -0800 (PST), haiticare2011@gmail.com wrote:>I remember reading some while ago that LLL was working with fast switching transistors which generated "radar wavelength" signals. Then, as events go, a Georgia Tech Prof. raised a stink since he had previously developed those applications. Again, a vague memory. Does anyone recall this? >TIA >JBThe idea was broadband impulse radar, using step-recovery diode pulsers and some sort of audio-IF-range receive mixer. The guy was McKeon or something like that. He has a bunch of patents, and started his own company, but it didn't seem to go. -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation
Reply by ●February 7, 20142014-02-07
On 2014-02-07 16:28, John Larkin wrote:> On Fri, 7 Feb 2014 05:09:02 -0800 (PST), haiticare2011@gmail.com > wrote: > >> I remember reading some while ago that LLL was working with fast >> switching transistors which generated "radar wavelength" signals. >> Then, as events go, a Georgia Tech Prof. raised a stink since he >> had previously developed those applications. Again, a vague memory. >> Does anyone recall this? TIA JB > > The idea was broadband impulse radar, using step-recovery diode > pulsers and some sort of audio-IF-range receive mixer. The guy was > McKeon or something like that. He has a bunch of patents, and started > his own company, but it didn't seem to go. > >McEwan? Jeroen Belleman
Reply by ●February 7, 20142014-02-07
On Friday, February 7, 2014 8:09:02 AM UTC-5, haitic...@gmail.com wrote:> I remember reading some while ago that LLL was working with fast switchin=g transistors which generated "radar wavelength" signals. Then, as events g= o, a Georgia Tech Prof. raised a stink since he had previously developed th= ose applications. Again, a vague memory. Does anyone recall this?>=20 > TIA >=20 > JBDo you want to know about the radar circuits or the tiff between a bunch of= nobodies at overfunded cesspool bureaucracies???
Reply by ●February 7, 20142014-02-07
On Fri, 07 Feb 2014 16:44:20 +0100, Jeroen Belleman <jeroen@nospam.please> wrote:>On 2014-02-07 16:28, John Larkin wrote: >> On Fri, 7 Feb 2014 05:09:02 -0800 (PST), haiticare2011@gmail.com >> wrote: >> >>> I remember reading some while ago that LLL was working with fast >>> switching transistors which generated "radar wavelength" signals. >>> Then, as events go, a Georgia Tech Prof. raised a stink since he >>> had previously developed those applications. Again, a vague memory. >>> Does anyone recall this? TIA JB >> >> The idea was broadband impulse radar, using step-recovery diode >> pulsers and some sort of audio-IF-range receive mixer. The guy was >> McKeon or something like that. He has a bunch of patents, and started >> his own company, but it didn't seem to go. >> >> > >McEwan? > >Jeroen BellemanYes. Tom McEwan http://www.osti.gov/includes/doepatents/includes/MicroPower.pdf -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation
Reply by ●February 7, 20142014-02-07
<haiticare2011@gmail.com> wrote in message news:6473bf77-f37e-4207-81a1-7bba9945a7ba@googlegroups.com...> I remember reading some while ago that LLL was working with fast switching > transistors which generated "radar wavelength" signals. Then, as events > go, a Georgia Tech Prof. raised a stink since he had previously developed > those applications. Again, a vague memory. Does anyone recall this?On one of my downloading sprees, I got various radar circuit schematics with a smattering of transistor types and vintage stuff dating back to WW2. A prominent book on the site I think they might have come from is: gunplexer cookbook, if you search that you might find a site with all kinds of UHF/EHF military stuff. If you're doing really low power stuff, the ZTX415 avalanche transistor might do for producing narrow pulses - you go for a Vcc of 60V or more, your energy storage device is a tuned length of co-ax cable, you set the transistor up just short of breakdown and trigger it with a pulse to the base. Pulsewidths of a few nS are a typical application.
Reply by ●February 7, 20142014-02-07
Ian Field wrote:> > > <haiticare2011@gmail.com> wrote in message > news:6473bf77-f37e-4207-81a1-7bba9945a7ba@googlegroups.com... >> I remember reading some while ago that LLL was working with fast >> switching transistors which generated "radar wavelength" signals. Then, >> as events go, a Georgia Tech Prof. raised a stink since he had previously >> developed those applications. Again, a vague memory. Does anyone recall >> this? > > On one of my downloading sprees, I got various radar circuit schematics > with a smattering of transistor types and vintage stuff dating back to > WW2. > > A prominent book on the site I think they might have come from is: > gunplexer cookbook, if you search that you might find a site with all > kinds of UHF/EHF military stuff. > > If you're doing really low power stuff, the ZTX415 avalanche transistor > might do for producing narrow pulses - you go for a Vcc of 60V or more, > your energy storage device is a tuned length of co-ax cable, you set the > transistor up just short of breakdown and trigger it with a pulse to the > base. Pulsewidths of a few nS are a typical application.How do you focus the energy? A dish is broadband, but the feed horn generally is a band limited device. Your receiver would be broadband too, so this seems like a great way to get jammed.
Reply by ●February 7, 20142014-02-07
On Fri, 7 Feb 2014 08:05:00 -0800 (PST), bloggs.fredbloggs.fred@gmail.com wrote:>On Friday, February 7, 2014 8:09:02 AM UTC-5, haitic...@gmail.com wrote: >> I remember reading some while ago that LLL was working with fast switching transistors which generated "radar wavelength" signals. Then, as events go, a Georgia Tech Prof. raised a stink since he had previously developed those applications. Again, a vague memory. Does anyone recall this? >> >> TIA >> >> JB > >Do you want to know about the radar circuits or the tiff between a bunch of nobodies at overfunded cesspool bureaucracies???Tiff! Tiff! -- John Larkin Highland Technology, Inc jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Reply by ●February 7, 20142014-02-07
On Friday, February 7, 2014 6:10:20 PM UTC-5, John Larkin wrote:> On Fri, 7 Feb 2014 08:05:00 -0800 (PST), >=20 > bloggs.fredbloggs.fred@gmail.com wrote: >=20 >=20 >=20 > >On Friday, February 7, 2014 8:09:02 AM UTC-5, haitic...@gmail.com wrote: >=20 > >> I remember reading some while ago that LLL was working with fast switc=hing transistors which generated "radar wavelength" signals. Then, as event= s go, a Georgia Tech Prof. raised a stink since he had previously developed= those applications. Again, a vague memory. Does anyone recall this?>=20 > >>=20 >=20 > >> TIA >=20 > >>=20 >=20 > >> JB >=20 > > >=20 > >Do you want to know about the radar circuits or the tiff between a bunch=of nobodies at overfunded cesspool bureaucracies???>=20 >=20 >=20 > Tiff! Tiff! >=20 >=20 >=20 >=20 >=20 > --=20 >=20 >=20 >=20 > John Larkin Highland Technology, Inc >=20 >=20 >=20 > jlarkin att highlandtechnology dott com >=20 > http://www.highlandtechnology.comThis individual actually makes UWB products: http://www.microwavejournal.com/authors/792-terence-w-barrett/articles
Reply by ●February 7, 20142014-02-07
On Fri, 7 Feb 2014 17:49:27 -0800 (PST), bloggs.fredbloggs.fred@gmail.com wrote:>On Friday, February 7, 2014 6:10:20 PM UTC-5, John Larkin wrote: >> On Fri, 7 Feb 2014 08:05:00 -0800 (PST), >> >> bloggs.fredbloggs.fred@gmail.com wrote: >> >> >> >> >On Friday, February 7, 2014 8:09:02 AM UTC-5, haitic...@gmail.com wrote: >> >> >> I remember reading some while ago that LLL was working with fast switching transistors which generated "radar wavelength" signals. Then, as events go, a Georgia Tech Prof. raised a stink since he had previously developed those applications. Again, a vague memory. Does anyone recall this? >> >> >> >> >> >> TIA >> >> >> >> >> >> JB >> >> > >> >> >Do you want to know about the radar circuits or the tiff between a bunch of nobodies at overfunded cesspool bureaucracies??? >> >> >> >> Tiff! Tiff! >> >> >> >> >> >> -- >> >> >> >> John Larkin Highland Technology, Inc >> >> >> >> jlarkin att highlandtechnology dott com >> >> http://www.highlandtechnology.com > >This individual actually makes UWB products: > >http://www.microwavejournal.com/authors/792-terence-w-barrett/articles2001. UWB was very hot back then, but seems to have faded. -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation
