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#4040
by
FattyLumpkin
on 25 Jul, 2016 01:28
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RERT, if you paste this (below) in you'll be able to see Fetta giving an explanation of Cannae ---there are also other videos you will be able to view (Cannae related) unfortunately I'm unable to get to a direct link to the video itself...but it can be accessed though this article: if you are using Google or other, paste it directly into the search bar...it should take you right to it.
Inventor Guido Fetta describes EMdrive related propellentless Cannae drive aka Q drive system
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#4041
by
JonathanD
on 25 Jul, 2016 02:42
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Well whether Fetta has an understanding of the reason for the effect, it certainly seems as though he is stressing the low temperature environment. Would experiments at the temperatures he discussed eliminate potential thermal anomalies?
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#4042
by
flux_capacitor
on 26 Jul, 2016 17:09
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RERT, if you paste this (below) in you'll be able to see Fetta giving an explanation of Cannae ---there are also other videos you will be able to view (Cannae related) unfortunately I'm unable to get to a direct link to the video itself...but it can be accessed though this article: if you are using Google or other, paste it directly into the search bar...it should take you right to it.
Inventor Guido Fetta describes EMdrive related propellentless Cannae drive aka Q drive system
I think this is the link to the video you're talking about:
http://www.dailymail.co.uk/video/sciencetech/video-1109504/Solar-powered-microwave-space-engine-day-sun.html
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#4043
by
RERT
on 26 Jul, 2016 17:34
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#4044
by
WarpTech
on 27 Jul, 2016 16:39
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RERT, if you paste this (below) in you'll be able to see Fetta giving an explanation of Cannae ---there are also other videos you will be able to view (Cannae related) unfortunately I'm unable to get to a direct link to the video itself...but it can be accessed though this article: if you are using Google or other, paste it directly into the search bar...it should take you right to it.
Inventor Guido Fetta describes EMdrive related propellentless Cannae drive aka Q drive system
I think this is the link to the video you're talking about:
http://www.dailymail.co.uk/video/sciencetech/video-1109504/Solar-powered-microwave-space-engine-day-sun.html
Interesting video. I can understand that with slots in one side and not the other, that there will be a greater radiation pressure on one side, and a greater Lorentz force-density on that side. However, I believe when you integrate the higher pressure over the reduced surface area, the Lorentz force will be balanced. Then there's the issue of; "how does the momentum get out of the sealed cylinder?"
I would like to see the paper that explains the Cannae drive.
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#4045
by
CorvusCorax
on 27 Jul, 2016 16:40
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Hi,
I haven't contributed to this effort yet, and I have very little theoretical understanding, so please excuse if this is absolute garbage...
but, would it be worth trying to tune a frustrum to the excitation frequency of an available fluid or solid it is filled with - and as such create a maser?
I just read about hydrogen masers, which operate on 1420,405 MHz - but they need atomar hydrogen, which is hard to continuously come by. Another option might be ammonia, which I read at an non trustworthy source excites around 24 GHz
this source from 2012 has a maser design using a crystal made from pentacene
http://www.wired.co.uk/article/maser-inventionThey used an optical laser to pump the crystal, but it should be possible to use a magnetron and use the rest only to amplify highly coherent and phase synchronous microwaves.
Would maser characteristics even offer any advantages to the properties needed for an efficient EM drive?
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#4046
by
Monomorphic
on 27 Jul, 2016 19:59
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I've been working on the ADC resolution problem. Upon a closer look, it looks like I have two options that are much cheaper than the $500 unit.
The $155 DI-155 provides 610 microvolt resolution on the its most sensitive
measurement range, +-2.5 V. This would half the measurement distance of the LDS from +-10mm to +-5mm.
http://www.dataq.com/resources/pdfs/datasheets/di-155ds-usb-data-acquisition.pdfThe $299 DI-245 provides 605 microvolt resolution, but over +-5 V, the full range of the LDS. It also accepts a number of other voltages that could be used by other sensors in the future.
http://www.dataq.com/resources/pdfs/datasheets/di-245ds.pdfSo in a limited mode, the DI-155 increases the resolution of the LDS 30-fold over current ADC resolution of 19.5mV. The DI-245 increases the resolution 30-fold as well, and also allows me to measure the full displacement of the LDS - but it's double the price.
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#4047
by
Monomorphic
on 27 Jul, 2016 20:16
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#4048
by
Tellmeagain
on 27 Jul, 2016 20:20
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Just got off the phone with a Dataq rep. They recommended the DI-2108. It's 16-bit so over the 1-5V range, I will have ~13,000 counts, compared to the ~220 for the current ADC. It's only $250!
http://www.dataq.com/resources/pdfs/datasheets/di-2108-usb-daq-datasheet.pdf
Would you please clarify your resolution problem? You said 220 counts of current ADC, is it a 8 bit ADC?
Regarding DI-155 vs DI-245, why don't you just use a op-amp to attenuate the 0-5V input to 0-2.5? The cost is only ~$1.
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#4049
by
Monomorphic
on 27 Jul, 2016 20:46
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Just got off the phone with a Dataq rep. They recommended the DI-2108. It's 16-bit so over the 1-5V range, I will have ~13,000 counts, compared to the ~220 for the current ADC. It's only $250!
http://www.dataq.com/resources/pdfs/datasheets/di-2108-usb-daq-datasheet.pdf
Would you please clarify your resolution problem? You said 220 counts of current ADC, is it a 8 bit ADC?
Regarding DI-155 vs DI-245, why don't you just use a op-amp to attenuate the 0-5V input to 0-2.5? The cost is only ~$1.
It is 10-bit over +-10 V. The 4-20mA LDS only uses 1-5 V. Sorry, I meant only 256 counts, not 220.
As for attenuating the 1-5V to 0-2.5V, on the DI-155, the gentleman on the phone did the math and since the DI-155 is only 13-bit, while the DI-2108 is 16-bit, I still get more counts with the DI-2108.
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#4050
by
jmossman
on 27 Jul, 2016 22:39
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Just got off the phone with a Dataq rep. They recommended the DI-2108. It's 16-bit so over the 1-5V range, I will have ~13,000 counts, compared to the ~220 for the current ADC. It's only $250!
http://www.dataq.com/resources/pdfs/datasheets/di-2108-usb-daq-datasheet.pdf
It is 10-bit over +-10 V. The 4-20mA LDS only uses 1-5 V. Sorry, I meant only 256 counts, not 220.
As for attenuating the 1-5V to 0-2.5V, on the DI-155, the gentleman on the phone did the math and since the DI-155 is only 13-bit, while the DI-2108 is 16-bit, I still get more counts with the DI-2108.
The DI-2108 also has a 1 channel sampling rate of ~8kHz with the 16-bit resolution (versus the 240Hz of your current model), so you'd definitely be able to eliminate any sampling and/or quantization artifacts.
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#4051
by
Monomorphic
on 27 Jul, 2016 23:44
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Wanted to share an image illustrating how I calibrated the offset and span settings on the Laser Displacement Sensor (LDS). Middle is 40mm, +-10mm.
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#4052
by
CorvusCorax
on 28 Jul, 2016 21:23
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I've been working on the ADC resolution problem. Upon a closer look, it looks like I have two options that are much cheaper than the $500 unit.
The $155 DI-155 provides 610 microvolt resolution on the its most sensitive
measurement range, +-2.5 V. This would half the measurement distance of the LDS from +-10mm to +-5mm.
http://www.dataq.com/resources/pdfs/datasheets/di-155ds-usb-data-acquisition.pdf
The $299 DI-245 provides 605 microvolt resolution, but over +-5 V, the full range of the LDS. It also accepts a number of other voltages that could be used by other sensors in the future.
http://www.dataq.com/resources/pdfs/datasheets/di-245ds.pdf
So in a limited mode, the DI-155 increases the resolution of the LDS 30-fold over current ADC resolution of 19.5mV. The DI-245 increases the resolution 30-fold as well, and also allows me to measure the full displacement of the LDS - but it's double the price.
The company I work for designs electronic measurement devices. One of the ADC's we use is this one:
http://www.semtech.com/analog-controllers-sensors-converters/signal-conditioners/sx8723c/It's a 16bit ADC combined with an integrated programmable gain amplifier that can zoom and offset the adc's "sensitive window" dynamically. The max gain of the amplifier is 1k, so that gives you a theoretical resolution of 1/65536000 of your reference voltage - and then you can do oversampling on top of that.
(You'll have to. At that amplification, if you don't average over a lot of measurements or your signal has very low impedance all you see is noise)
With a 2000mV reference voltage at max gain you'd have roughly 50nV (per bit) theoretical resolution.
I don't know any ready to buy devices with one of these chips, (I'm sure there are) but you can also get the chip for single digit number of <insert currency here> from a component distributor or ask the chip manufacturer for free samples, then design your own measurement board using the reference design, a stable ref voltage, and an arduino or raspberry to talk to your computer and log/display the data.
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#4053
by
demofsky
on 29 Jul, 2016 02:20
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Hi,
I haven't contributed to this effort yet, and I have very little theoretical understanding, so please excuse if this is absolute garbage...
but, would it be worth trying to tune a frustrum to the excitation frequency of an available fluid or solid it is filled with - and as such create a maser?
I just read about hydrogen masers, which operate on 1420,405 MHz - but they need atomar hydrogen, which is hard to continuously come by. Another option might be ammonia, which I read at an non trustworthy source excites around 24 GHz
this source from 2012 has a maser design using a crystal made from pentacene
http://www.wired.co.uk/article/maser-invention
They used an optical laser to pump the crystal, but it should be possible to use a magnetron and use the rest only to amplify highly coherent and phase synchronous microwaves.
Would maser characteristics even offer any advantages to the properties needed for an efficient EM drive?
This was discussed earlier wher Dr Rodal proposed using ammonia as a filler also. So far, no one has taken this approach to the next level and ran simulations on the concept - as far as I can recall.
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#4054
by
FattyLumpkin
on 29 Jul, 2016 03:26
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*****ALERT****** CANNAE is down! (This assumes of course there isn't a glitch of sorts going on with my equipment) Is anyone able to get on? FL
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#4055
by
SeeShells
on 29 Jul, 2016 03:46
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*****ALERT****** CANNAE is down! (This assumes of course there isn't a glitch of sorts going on with my equipment) Is anyone able to get on? FL
It says "THIS SITE IS UNDER CONSTRUCTION"
Not down.
Shell
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#4056
by
JonathanD
on 29 Jul, 2016 04:25
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*****ALERT****** CANNAE is down! (This assumes of course there isn't a glitch of sorts going on with my equipment) Is anyone able to get on? FL
It says "THIS SITE IS UNDER CONSTRUCTION"
Not down.
Shell
Yes, and it's not like an ISP generic "site is under construction" but rather it still has their logo and such. They are obviously getting some kind of funding, I wonder if as part of that there were some demands as to what the public facing website would look like?
Between the last announcement of the separate cubesat thruster endeavor and this, it seems like
something is happening at Cannae.
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#4057
by
FattyLumpkin
on 29 Jul, 2016 04:53
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Indeed, I should have said "Inaccessible" and not "down" Did anyone see the specifics re this upcoming test/demonstration? Cannae claims they will be able to maintain this orbital altitude with only 12 Watts of power. Any thoughts about that ? anyone? I recognize they are working with super cooled Niobium, but that strikes me as near to impossible as one might get.
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#4058
by
Monomorphic
on 29 Jul, 2016 16:32
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New ADC arrived. HUGE improvement in resolution of the data. These are two-minute unpowered tests with CPU fan going in the room - which I did on purpose so there would be a little movement. Top image is with the new ADC, bottom image is with the old one. Settings are the same. Flattened areas are completely gone.
I am using the 20 µm setting on the LDS for these runs, so I should be able to squeeze out even more resolution using the 3 µm setting!
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#4059
by
TheTraveller
on 29 Jul, 2016 20:25
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Indeed, I should have said "Inaccessible" and not "down" Did anyone see the specifics re this upcoming test/demonstration? Cannae claims they will be able to maintain this orbital altitude with only 12 Watts of power. Any thoughts about that ? anyone? I recognize they are working with super cooled Niobium, but that strikes me as near to impossible as one might get.
AFAIK, the Cannae CubeSat thruster is not cooled.
