+ Post New Thread
Page 1 of 2 12 LastLast
Results 1 to 20 of 28
  1. #1
    Full Member level 2
    Points: 2,588, Level: 11

    Join Date
    Nov 2003
    Posts
    125
    Helped
    2 / 2
    Points
    2,588
    Level
    11

    How to build a small radar?

    Any ideas/help/links?

    Thanks!

  2. #2
    Junior Member level 1
    Points: 1,859, Level: 10

    Join Date
    May 2003
    Posts
    18
    Helped
    0 / 0
    Points
    1,859
    Level
    10

    Re: How to build a small radar?

    will you specify more?
    i mean range,minimal distance,frequency and so on.



  3. #3
    Advanced Member level 5
    Points: 37,801, Level: 47
    flatulent's Avatar
    Join Date
    Jul 2002
    Location
    Middle Earth
    Posts
    4,632
    Helped
    477 / 477
    Points
    37,801
    Level
    47

    Re: How to build a small radar?

    There are also the laws to consider. You can only operate in unlicensed bands and the laws in some countries do not allow pulsed operation in these bands. You will be restricted to Doppler type systems either monostatic or bistatic.



    •   Alt1st January 2005, 21:27

      advertising

        
       

  4. #4
    Newbie level 4
    Points: 1,449, Level: 8

    Join Date
    Jan 2005
    Posts
    5
    Helped
    0 / 0
    Points
    1,449
    Level
    8

    Re: How to build a small radar?

    I am also looking into constructing a small radar, but for weather, similar to the usa weather radars.
    Being a licenced radio amateur, I may be able to use certain microwave freqs.....

    thanks
    eddy



  5. #5
    Full Member level 6
    Points: 5,417, Level: 17

    Join Date
    Feb 2002
    Location
    Italy
    Posts
    384
    Helped
    39 / 39
    Points
    5,417
    Level
    17

    Re: How to build a small radar?

    To build a wheather radar you need a lot of power and this is not allowed on many countries.
    Also the frequencies used are quite high and you need a lot of experience.
    Last take care not to interfere in the other transmissions because the laws are very strict in this field and overall if you disturb the military frequencies ( very common in X band ) you will be in trouble.

    Mandi



  6. #6
    Newbie level 4
    Points: 1,449, Level: 8

    Join Date
    Jan 2005
    Posts
    5
    Helped
    0 / 0
    Points
    1,449
    Level
    8

    Re: How to build a small radar?

    I can use frequencies as high as 24ghz....and beyond....
    The power level does need to be too high as its not for extremely long range......maybe 2 miles max.
    I want to look at the contents of storm cells as they pass overhead.....

    JOHN



  7. #7
    Full Member level 2
    Points: 2,449, Level: 11

    Join Date
    Apr 2004
    Posts
    122
    Helped
    2 / 2
    Points
    2,449
    Level
    11

    Re: How to build a small radar?

    I think that 2.4 GHz is a good band also for buying commercial
    moduls.
    It allows you to have "small" antenna for a bistatic solution
    that I think is much easier to build.

    Of course you should know the laws in your country before
    start using a radar



    •   Alt2nd January 2005, 11:02

      advertising

        
       

  8. #8
    Newbie level 4
    Points: 1,449, Level: 8

    Join Date
    Jan 2005
    Posts
    5
    Helped
    0 / 0
    Points
    1,449
    Level
    8

    Re: How to build a small radar?

    do you know of any commerial units and the url

    thanks



  9. #9
    Full Member level 3
    Points: 3,086, Level: 13
    batdin's Avatar
    Join Date
    Jun 2004
    Location
    Bulgaria
    Posts
    182
    Helped
    5 / 5
    Points
    3,086
    Level
    13

    Re: How to build a small radar?

    Pardon me,but how do you intend to make a 3D-scanning antenna?
    (weather radars are 3D-radars)
    For weather radars higher frequencies are preferable because the echo is stronger.
    The difference between reflection properties at 2GHz and 4GHz is 16 times!
    But it is not a JOKE to make a weather radar.Even a short-range one.
    If everything looks fine,there must be something very wrong here.



  10. #10
    Newbie level 3
    Points: 1,441, Level: 8

    Join Date
    Jan 2005
    Posts
    3
    Helped
    0 / 0
    Points
    1,441
    Level
    8

    Re: How to build a small radar?

    I worked on a tubed radar in the air force. You might be able to find them for sale online since they are currently obsolete. The nomenclature was "FPS-77".

    If you get one, be prepared to pay a heafty shipping fee and an equally heafty electric bill.



    •   Alt3rd January 2005, 21:43

      advertising

        
       

  11. #11
    Full Member level 3
    Points: 2,566, Level: 11
    puviarasu's Avatar
    Join Date
    Dec 2004
    Location
    India
    Posts
    155
    Helped
    14 / 14
    Points
    2,566
    Level
    11

    Re: How to build a small radar?

    Can it is possible to build radar which uses signals in range of RF ?



  12. #12
    Newbie level 3
    Points: 1,441, Level: 8

    Join Date
    Jan 2005
    Posts
    3
    Helped
    0 / 0
    Points
    1,441
    Level
    8

    Re: How to build a small radar?

    The one I worked on was rather crude. It was basically ping and listen at 5.5xxGhz using a large magnatron for the transmitter and a small klyston for the heterodyne circuit. If you can get a transmitter that can run at 100watts or more, it shouldn't be too hard if you are up to snuff on electromagnetic fields and radio theory.



  13. #13
    Full Member level 2
    Points: 2,588, Level: 11

    Join Date
    Nov 2003
    Posts
    125
    Helped
    2 / 2
    Points
    2,588
    Level
    11

    How to build a small radar?

    Thanks for answers.I just want to build a small working model with any range for demonstration purposes.Is it possible ?



  14. #14
    Full Member level 6
    Points: 5,417, Level: 17

    Join Date
    Feb 2002
    Location
    Italy
    Posts
    384
    Helped
    39 / 39
    Points
    5,417
    Level
    17

    Re: How to build a small radar?

    About the transmitter section, you can use the magnetron of a microwave oven, if you decide to use 2,4 GHz as working frequency.
    Output power is about 500 W.

    Take a lot of care about the high voltages used to fire the tube.

    Mandi



  15. #15
    Full Member level 2
    Points: 2,449, Level: 11

    Join Date
    Apr 2004
    Posts
    122
    Helped
    2 / 2
    Points
    2,449
    Level
    11

    Re: How to build a small radar?

    For a commercial solution you could visit ham related web sites,
    they have also stuff for 5GHz.

    I don't think you could build a 3D radar, but with a very simple equip.
    you could be able to measure echo delays and thus distance from rain or other
    (I would suggest to think to 10 GHz... you may find pieces of equipment from hams
    they home brew their stuff at that frequency).

    Just an idea.

    Ciao



  16. #16
    Advanced Member level 4
    Points: 10,008, Level: 23
    FoxyRick's Avatar
    Join Date
    Jan 2004
    Location
    England, UK
    Posts
    1,234
    Helped
    307 / 307
    Points
    10,008
    Level
    23

    Re: How to build a small radar?

    coolchip,

    You might be able to find an old radar intruder alarm sensor, these were quite common before good body heat sensors become popular. These have most of the needed electronics on the main unit with the transmit and receive horns. They are doppler (so detect movement towards/away from the radar, rather than giving a distance measurment) and give a signal proportional to the velocity. You might be able to redesign them for pulse mode, certainly you have all the main necessary bits already made.

    For a nice demonstration, I would imagine they are ideal. They come up on eBay every so often, one day I might get one myself. I used to play Paintball and always wanted a small, portable radar to detect incoming enemy.

    I can't find a complete one on eBay at the moment to show you, but someone is selling one of the horns removed from the complete module.

    http://cgi.ebay.co.uk/ws/eBayISAPI.d...878104877&rd=1

    Hope this gives you some ideas,
    FoxyRick.


    1 members found this post helpful.

  17. #17
    Junior Member level 1
    Points: 1,875, Level: 10

    Join Date
    Feb 2005
    Posts
    18
    Helped
    2 / 2
    Points
    1,875
    Level
    10

    Re: How to build a small radar?

    Hi

    Try this one, from Ham radio.

    Angelo.


    1 members found this post helpful.

  18. #18
    Full Member level 5
    Points: 2,921, Level: 12

    Join Date
    Jan 2005
    Posts
    255
    Helped
    19 / 19
    Points
    2,921
    Level
    12

    Re: How to build a small radar?

    Quote Originally Posted by angie-filt
    Hi

    Try this one, from Ham radio.

    .
    just only scan text not helpful no schematic


    1 members found this post helpful.

  19. #19
    Member level 1
    Points: 1,632, Level: 9

    Join Date
    May 2005
    Location
    Philippines
    Posts
    36
    Helped
    6 / 6
    Points
    1,632
    Level
    9

    How to build a small radar?

    does it work???


    1 members found this post helpful.

  20. #20
    Newbie level 1
    Points: 1,208, Level: 7

    Join Date
    Apr 2006
    Posts
    1
    Helped
    1 / 1
    Points
    1,208
    Level
    7

    How to build a small radar?

    Does anyone know how to build or find schematics on how to build a small dopplar radar system.

    Thankyou


    1 members found this post helpful.

+ Post New Thread
Please login
Page 1 of 2 12 LastLast