Quote from: zellerium on 10/08/2015 04:05 amQuote from: TheTraveller on 10/08/2015 03:17 amQuote from: rfmwguy on 10/08/2015 12:24 amTechnical thoughts out loud - so this electronic frequency lock to resonance is bothering me a bit. As I visualize the setup, it becomes more expensive, complex and heavier.As a possible solution, was thinking to go simple...rather than more precise, go less.Mag sprays rf, pulsed. Stop pulsing with new power supply. But, modify mag for sweep. Spray a bandwidth of swept rf, bound to hit resonance at some point as resonance slowly changes due to thermal changes.Comments welcomed...On my way home from latest rad treatment. Will then post simple filtered full wave mod to existing maggie 1/2 wave non filtered pwr supply. Will allow fullly variable DC while maintaining fixed AC heater voltage.I had a chance to chat with a electronics buyer for Lockheed at an info session tonight who seemed to know quite a bit about the EM Drive. He started in Aerospace, then MS in electrical, but I didn't get a complete background... His stance: a magnetron is too dirty, imprecise, and difficult to control to make it worthwhile for the application. He thought even circulators wouldn't constrict the bandwidth enough to supply the cavity you're looking for while maintaining a reasonable vswr. Not exactly what anyone wants to hear, but thought it was worth mentioning...But the reason a magnetron has apparently yielded such higher efficiencies still perplexes me. Also the reasoning behind the dielectric requirement with an amplifier... I know I keep bringing these back up but I feel like those two differences are key to understanding the phenomenon. Maybe I should be desinging an amplifier experiment to focus on that factor in particular; what thickness of dielectric is ideal and WHY?Shawyer did use dielectrics in his 2002 Experimental EMDrive but abandoned dielectrics in 2004. His Demonstrator and Flight Thruster EMDrives are dielectric free plus both use spherical end plates.The Flight Thruster uses active narrow band solid state + TWTA generation & electronic freq tracking and no mechanical tuning, while the Experimental used mechanical tuning with fixed maggie freq and the Demonstrator used both maggie freq adjustment and mechanical tuning.As far as I know, SPR currently use solid state Rf gen with active best freq tracking and no mechanical resonance tuning.BTW I agree with the Lockheed buyer. That is why I have gone pure solid state using a programmable 1kHz freq stepper Rf gen and a 500mHz to 2.5gHz wide band 100w Rf amp.
Quote from: TheTraveller on 10/08/2015 03:17 amQuote from: rfmwguy on 10/08/2015 12:24 amTechnical thoughts out loud - so this electronic frequency lock to resonance is bothering me a bit. As I visualize the setup, it becomes more expensive, complex and heavier.As a possible solution, was thinking to go simple...rather than more precise, go less.Mag sprays rf, pulsed. Stop pulsing with new power supply. But, modify mag for sweep. Spray a bandwidth of swept rf, bound to hit resonance at some point as resonance slowly changes due to thermal changes.Comments welcomed...On my way home from latest rad treatment. Will then post simple filtered full wave mod to existing maggie 1/2 wave non filtered pwr supply. Will allow fullly variable DC while maintaining fixed AC heater voltage.I had a chance to chat with a electronics buyer for Lockheed at an info session tonight who seemed to know quite a bit about the EM Drive. He started in Aerospace, then MS in electrical, but I didn't get a complete background... His stance: a magnetron is too dirty, imprecise, and difficult to control to make it worthwhile for the application. He thought even circulators wouldn't constrict the bandwidth enough to supply the cavity you're looking for while maintaining a reasonable vswr. Not exactly what anyone wants to hear, but thought it was worth mentioning...But the reason a magnetron has apparently yielded such higher efficiencies still perplexes me. Also the reasoning behind the dielectric requirement with an amplifier... I know I keep bringing these back up but I feel like those two differences are key to understanding the phenomenon. Maybe I should be desinging an amplifier experiment to focus on that factor in particular; what thickness of dielectric is ideal and WHY?
Quote from: rfmwguy on 10/08/2015 12:24 amTechnical thoughts out loud - so this electronic frequency lock to resonance is bothering me a bit. As I visualize the setup, it becomes more expensive, complex and heavier.As a possible solution, was thinking to go simple...rather than more precise, go less.Mag sprays rf, pulsed. Stop pulsing with new power supply. But, modify mag for sweep. Spray a bandwidth of swept rf, bound to hit resonance at some point as resonance slowly changes due to thermal changes.Comments welcomed...On my way home from latest rad treatment. Will then post simple filtered full wave mod to existing maggie 1/2 wave non filtered pwr supply. Will allow fullly variable DC while maintaining fixed AC heater voltage.
Technical thoughts out loud - so this electronic frequency lock to resonance is bothering me a bit. As I visualize the setup, it becomes more expensive, complex and heavier.As a possible solution, was thinking to go simple...rather than more precise, go less.Mag sprays rf, pulsed. Stop pulsing with new power supply. But, modify mag for sweep. Spray a bandwidth of swept rf, bound to hit resonance at some point as resonance slowly changes due to thermal changes.Comments welcomed...
Quote from: francesco nicoli on 10/07/2015 03:58 pmA side note- is there any known reason why Dr. Rodal has disappeared? I actually miss his posts, they were always helpful to clarify ongoing work.I asked this question a few days ago, http://forum.nasaspaceflight.com/index.php?topic=38203.msg1431110#msg1431110The best answer I got was "He is here, he is fine",http://forum.nasaspaceflight.com/index.php?topic=38203.msg1431246#msg1431246
A side note- is there any known reason why Dr. Rodal has disappeared? I actually miss his posts, they were always helpful to clarify ongoing work.
Quote from: Flyby on 10/07/2015 11:07 pmQuote from: Tellmeagain on 10/07/2015 08:31 pmQuote from: francesco nicoli on 10/07/2015 03:58 pmA side note- is there any known reason why Dr. Rodal has disappeared? I actually miss his posts, they were always helpful to clarify ongoing work.I asked this question a few days ago, http://forum.nasaspaceflight.com/index.php?topic=38203.msg1431110#msg1431110The best answer I got was "He is here, he is fine",http://forum.nasaspaceflight.com/index.php?topic=38203.msg1431246#msg1431246I would not worry too much. I think dr Rodal has his good reasons not to communicate, although he clearly has the possibility to do so, simply because he keeps following these posts, as we can observe from his topic "likes".Knowing that dr.Rodal has his own engineering consultancy business, I would not be surprised he signed an NDA that prohibits any form of related communication.It's a shot in the dark and I'm the only one to blame for the assumption that follows, but considering his expertise demonstrated inhere and his previous collaboration with some ppl, my wild and outlandish guess is that he is currently, somehow, involved with the Eaglework research or any related paper that might be released in the future.sometimes, silence says as much as complete phrases... If dr Rodal does not take time to say "sorry guys/girls, I'm busy, you'll have to do it a few weeks without me" but still finds time to read and like topics on this forum, then it's clear to me that it is not a matter of not being able, but rather of not being allowed to say anything.If an NDA was signed, then he would simply not be allowed to continue his work here on the forum, as it would undoubtedly overlap with his non-public activities...so...Really, I do not think we should worry.. on the contrary...Both thumbs up..."way to go , doc!" and tell us all about it in a few months... Again...it is all speculation as nothing is confirmed...it's just a possible explanation, one of many.....Shell and I were joking about nsf-1701 accidentally beaming him into an alternate dimension, but I believe work is the likely cause. Since he's been reported to be ok, doesn't matter why...doc will be back when he can.Until then, let's bug shell for some more assembly pics
Quote from: Tellmeagain on 10/07/2015 08:31 pmQuote from: francesco nicoli on 10/07/2015 03:58 pmA side note- is there any known reason why Dr. Rodal has disappeared? I actually miss his posts, they were always helpful to clarify ongoing work.I asked this question a few days ago, http://forum.nasaspaceflight.com/index.php?topic=38203.msg1431110#msg1431110The best answer I got was "He is here, he is fine",http://forum.nasaspaceflight.com/index.php?topic=38203.msg1431246#msg1431246I would not worry too much. I think dr Rodal has his good reasons not to communicate, although he clearly has the possibility to do so, simply because he keeps following these posts, as we can observe from his topic "likes".Knowing that dr.Rodal has his own engineering consultancy business, I would not be surprised he signed an NDA that prohibits any form of related communication.It's a shot in the dark and I'm the only one to blame for the assumption that follows, but considering his expertise demonstrated inhere and his previous collaboration with some ppl, my wild and outlandish guess is that he is currently, somehow, involved with the Eaglework research or any related paper that might be released in the future.sometimes, silence says as much as complete phrases... If dr Rodal does not take time to say "sorry guys/girls, I'm busy, you'll have to do it a few weeks without me" but still finds time to read and like topics on this forum, then it's clear to me that it is not a matter of not being able, but rather of not being allowed to say anything.If an NDA was signed, then he would simply not be allowed to continue his work here on the forum, as it would undoubtedly overlap with his non-public activities...so...Really, I do not think we should worry.. on the contrary...Both thumbs up..."way to go , doc!" and tell us all about it in a few months... Again...it is all speculation as nothing is confirmed...it's just a possible explanation, one of many.....
Attached is the patent that cleans up the magnetron "spray". It simply adds 4 magnets to the radome (top) side circular magnet. It disrupts the field and presents a narrow band signal. This is the first step in my Phase II build, cleaning up that maggie. Next step after that...electronically variable center freq (wish me luck on that one).
Had a great day yesterday, birthday, seeing a dear old friend (her birthday is the same as mine) and getting the final sheets of copper from the water jet company. Nice dinner with some adult beverages... came home and crashed.
Happy Birthday Shell!
That seems like the ideal setup, especially when considering actually putting this system on a spacecraft. Satellites already use ss amps for comms so its only a matter of diverting the power that's already there.So Mr. Traveller, in your opinion, was EW finding (that a dielectric is required for an amplifier) a fluke? Were they using too little power, or was it a matter of the frustum shape? (flat ends vs spherical ends)Also, didn't Boeing purchase the flight thruster?
Quote from: rfmwguy on 10/08/2015 03:47 pmHappy Birthday Shell!AHHHH! Whoot Whoot Whoot!!!!Thanks!Shell
FYI:TESTS OF DISCRETE SPACE-TIME SYMMETRIEShttp://pdg.lbl.gov/2015/tables/rpp2015-conservation-laws.pdfHappy Birthday Shell !!
(...)Most of us know Dr. Rodel does consulting work and also the stock markets for a living. He is easy to lookup and has a quite impressive history. Plus we all know from working with him here he is one of a kind and very very good at what he does. I PMed him right after he went quiet and he replied he was working the stock markets and very very busy. Knowing the markets and how much flux they are in right now it's an ideal time to make a killing, if you know what your doing. I for one have no doubt he is pillaging the markets. The man is very sharp!If If Dr.Rodel is out doing what he needs to be doing to make a living, good for him and if it means for him to be quiet here to get-er done, then all I can say is I'll support him as he has supported us. Give em hell Dr. Rodel and make gazzilions!We should all do the same and give him the space he needs and best wishes.Shell
Quote from: SeeShells on 10/08/2015 01:44 pm(...)Most of us know Dr. Rodel does consulting work and also the stock markets for a living. He is easy to lookup and has a quite impressive history. Plus we all know from working with him here he is one of a kind and very very good at what he does. I PMed him right after he went quiet and he replied he was working the stock markets and very very busy. Knowing the markets and how much flux they are in right now it's an ideal time to make a killing, if you know what your doing. I for one have no doubt he is pillaging the markets. The man is very sharp!If If Dr.Rodel is out doing what he needs to be doing to make a living, good for him and if it means for him to be quiet here to get-er done, then all I can say is I'll support him as he has supported us. Give em hell Dr. Rodel and make gazzilions!We should all do the same and give him the space he needs and best wishes.ShellDear Shell,just one absolutely well-meaning remark (because you consistently get it wrong).. the good doctor's name is Rodal, not Rodel. Maybe the doc is earning tons of money, so there can be better and more EM-Drive research?Happy birthday & BR
500 Downloads on the NSF-1701 Phase I Test Report from this thread and last.Moral of the story...people are still interested in the emdrive concept and they are starving for information.Does not look like Cannae, Tajmar, Shawyer or Yang have anything new to report. Still have hopes that EW is busy at it from the rumors I heard last year.If anybody else finds anything out there, be sure to post it here.
Quote from: rfmwguy on 10/08/2015 10:54 pm500 Downloads on the NSF-1701 Phase I Test Report from this thread and last.Moral of the story...people are still interested in the emdrive concept and they are starving for information.Does not look like Cannae, Tajmar, Shawyer or Yang have anything new to report. Still have hopes that EW is busy at it from the rumors I heard last year.If anybody else finds anything out there, be sure to post it here.Haven't heard much from this side other than rumors that something might be happening. Who knows what it will be.Back at it... still working at it.Shell