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Last month I end work at vacuum microwave evaporator . There are 10 magnetrons with 14 kW total RF power. When they start work , all cellphones around stops work.It was hard to find where is RF leakage.
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[quote=Seeker;60273]you meens i cannot use a magnetron to generate one wave for transmitting? it´s no physicaly way.Originally posted by schatzsucher View Postcan use this part for build an impulsradar?
He he he , good joke! You can melt the treasure underground with this monster! Or bake worms and moles
It's cheaper , if you take magnetron from microwave oven. It work at 2,4GHz .
But magnetrons not applicable for GPR.
Any questions?
by the way:
The tube CWM-50L generate 896/915 MHz by 50 kW!
All the lower frequency than better to go inside the earth for electro-magnetic-waves - it´s my opinion.
But lower frequency - the object you want to detect more largely.
You can simplify: minimum object-size you want to detect = 1/10_lamda
By 2,4 GHz - what power is necessarily to detected an objects in the deep of 4 meter?Comment
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[quote=schatzsucher;60285]Magnetron can't generate one wave - it can generate burst of waves or continuous.Originally posted by Seeker View Postyou meens i cannot use a magnetron to generate one wave for transmitting? it´s no physicaly way.
by the way:
The tube CWM-50L generate 896/915 MHz by 50 kW!
All the lower frequency than better to go inside the earth for electro-magnetic-waves - it´s my opinion.
But lower frequency - the object you want to detect more largely.
You can simplify: minimum object-size you want to detect = 1/10_lamda
You do not need 50kW, you need no more then 5-10W for penetration of 10 meters,if you have good receiver.
2,4GHz is better , lamda for free air is ~12,5cm , if you right: 1/10 = 1,25 cm - it is very good resolutionComment
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Wireless Network Access Point GPR !!!!
Hi Seeker,
First: Thank you for you valuable infos you offered on this site.
I am very interested in GPR project and I am working on it using different parts.
Second: I have an idea of using PC wireless lan card (WLAN WiFi 2.4 i.e. 811.22g) or WiFi Access point that has two separate TRX units. Both could be programed to transmit and receive at the same time according to the desired puls ordered through a specifically writen protocol that shoud be installed on the same computer. The output RF power is differ from some 10mw - 50 mw and easily could be amplified upto 15 dBs vier available RF amplifiers that are available in the markets.
Up to now I could find a simple protocol that can turn this thing a very limted puls based RADAR.
What do think about this project? Does anyone has experiences in progarming.
What I simply know is that two programmings are required; a driver file that can translate between the PC and the Wireless Unit, and programming the micro-chip of the WU that maybe vier any Eprom Programmer.
Regards.
H ZirohComment
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Hi Unregistered,Originally posted by Unregistered View Post
you can't use WiFi equipment because WLAN work in simplex and times of switching TX-RX are very long in comparison with the necessary pulses and times for pulse radar. In fact for UWB GPR TXpulse mast be ~1ns, time of ringing of antena no more then 2ns,input of receiver ~2ns for turn-on.
If you add power amplifier at 1W to increase output power ,then times will increase too.
Of course some pulse GPRs has long times of switching but they hasn't good resolution.Comment
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So , I begin think that GPR is not for amaters ....Comment
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No, Seeker, no!!!!Originally posted by Seeker View Post
Not all amateur have 50 KW mains!
For example I have only 3 KW !!! ;-)))))
I'm sorry , Seeker, but please tell us more,
your info are very useful, I need to build
a "wall radar" in next 4 months, you have the only
useful info I found on the web.
Sincerely
PaulComment
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Hi Paul.
I am sorry for my reproof , but too many guys without nessesary skills ask me elementary things.
If you plan to build "wall radar", I will be glad to help you for project.
Best regards.Comment
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images
Hi Seeker,
Please post some pictures what your GPR shows on PC.
Best regards.Comment
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Hi Seeker
Can you please post some pictures of your GPR. What is real resolution and depth it could see.
Thanks in advanceComment
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gpr
Hi,Did you make this circuit.If you make it,please share the knowledge.
http://doks.katho.be/do/files/FiSe413e130e0a3c0e04010a3c8d81100079/Scriptie.pdf;jsessionid=35A84D68722D9791EAA05E3EA6 EBB5FB?recordId=SKAT413e130e0a3c0e04010a3c8d811000 78Comment
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Seeker_ spectrograph
Hi Guy,
Sorry I have been gone for so long. It looks as though there has been a lot of interest in GPR for uses of looking thru walls. And some really "off the wall" ideas. Like the magnetron, which would fry someone's hair. lol
Been working throughout this past year on an electric motor design into prototype. If you like, I can email you with details.
Also, if you recall my original project interest here, I was/am still trying to create a GPR scanner that would be gem sensitive. My latest thought on the matter is a modified spectrometer based on ground emitted rf from 60hz - 10Mhz. Or perhaps in the Thz range.
Do you have any experience/thoughts on that?Comment
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Seeker_ spectrograph
Hi Guy,
Sorry I have been gone for so long. It looks as though there has been a lot of interest in GPR for uses of looking thru walls. And some really "off the wall" ideas. Like the magnetron, which would fry someone's hair. lol
Been working throughout this past year on an electric motor design into prototype. If you like, I can email you with some details.
Also, if you recall my original project interest here, I was/am still trying to create a GPR scanner that would be gem sensitive. My latest thought on the matter is a modified spectrometer based on ground emitted rf from 60hz - 10Mhz.
Or perhaps in the Thz range. Which would go back to a conversation we started about Thz receivers some time back.
Do you have any experience/thoughts on these?
Happy New Year
GSComment
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Hi Gem Searcher,Originally posted by Gem Searcher View PostHi Guy,
Sorry I have been gone for so long. It looks as though there has been a lot of interest in GPR for uses of looking thru walls. And some really "off the wall" ideas. Like the magnetron, which would fry someone's hair. lol
Been working throughout this past year on an electric motor design into prototype. If you like, I can email you with some details.
Also, if you recall my original project interest here, I was/am still trying to create a GPR scanner that would be gem sensitive. My latest thought on the matter is a modified spectrometer based on ground emitted rf from 60hz - 10Mhz.
Or perhaps in the Thz range. Which would go back to a conversation we started about Thz receivers some time back.
Do you have any experience/thoughts on these?
Happy New Year
GS
it is nice to hear from you. What exact in motor design you do? Last month I made 3phase DC-AC convertor for redesign of automobile alternator in synchronous electric motor for electric car. It was very funny
I made some experiments with Peltier modules to increase sensitivity of sensors . It was very succesifuly. I think it can be used to produce THz sensor.
Happy New Year !Comment
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