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  1. M

    Digital radar speedometer

    Laser radar block diagram and explaination:- http://profusion.ittc.ku.edu/publications/documents/Allen2002_RSL%20TR%2018680-2.pdf
  2. M

    Digital radar speedometer

    I think for that u must know the transmitted frequency ......Can it be known here? how's the variation of the frequency taken and passed to display speed(in which part of the crkt, as mixer is used for rf crkts) ?..... U said 74hc can be used here.....I again read the desciption of the crkt and...
  3. M

    hi any one if have RC helicopter ckt

    http://www.helifever.com/forums/rc-helicopter-fever/
  4. M

    Digital radar speedometer

    -------------------------------------------------------------------------------- How do radar guns work? Radar guns utilize the "Doppler principle" to determine speed. They transmit radio waves at microwave frequencies, and when these waves strike a moving object, they are reflected back to the...
  5. M

    Digital radar speedometer

    "Magic"....yeah I think you're right :-\
  6. M

    want mobile jammer circiut

    Can this one be added with yours,Ante? mobile_jammer.pdf MAX2360-MAX2364.pdf
  7. M

    Digital radar speedometer

    yeah,Acc to my knowledge,doppler shift occurs to the modulation frequency......But how is it useful......Just leave the crkt at electronics-lab and tell me that how he counting of the received signal with doppler shift can be useful?How can it be converted to speed?Just ideas not referencing the...
  8. M

    Digital radar speedometer

    and this one.... Thanx
  9. M

    Digital radar speedometer

    Yeah, Audioguru,it is hard to understand without the details of the project.....I don't know where to find about it.....Googling didn't help me...... Sorry!any idea about this :-[
  10. M

    Digital radar speedometer

    What's the purpose of this(see labeled block)? I m unable to find a good detail on ladars in google......Have u any? there are many about radars but none explaining the steps of ladar..... You say that there is no mixer in our ladar......then It is not using the doppler shift????? Since the...
  11. M

    Digital radar speedometer

  12. M

    Digital radar speedometer

    I thought the output of the mixer is going to low pass filter.....Then what else?
  13. M

    Digital radar speedometer

    The signal entering in the ramsey display schematic(low pass filter) is the doppler shift? which is, for 2.6 GHz case, 7.76Hz for each mi/hr.....So,the crkt may be designed for 7.6Hz..... Can we FM modulate the laser beam?how? at 2.6GHz? If we fm modulate it and after the signal is received...
  14. M

    Digital radar speedometer

    :o oh! I thought u were referencing photo diode....the mixer not present in our circuit(laser)???? How can that RF modulated frequency be determined in the ladar? By now what I've learnt is that the rf frequency should be known.....I can't see without that how one can proceed ...... RF...
  15. M

    Digital radar speedometer

    I went through a link in google....and it says that for 2.6GHz transmitted frequency the doppler shift for eachmi/hr is 7.74.......... How to calculate the transmitted frequency in this case of ladar? So,I think that was what I was trying to claculate ...... But the formula can't do...
  16. M

    Digital radar speedometer

    "An RF mixer circuit "(detector diode)" gives their sum and their difference as a beat tone." I think by detecter diode u mean to refering to the schematic .....r u talking about the photodiode? The received signal will have the transmitted frequency+ doppler shift and I think there difference...
  17. M

    Digital radar speedometer

    Audioguru what it wants to do? referring to the truth table?  How to calculate it's frequency?u posted the formula on first page but R1 is not present here......R2<<<<R1 here???? Thanx
  18. M

    Digital radar speedometer

    there r two oscillators (two inverter c-mos type) Isn't it? Any idea what's the second one doing?
  19. M

    Digital radar speedometer

    "Maybe the laser is "modulated with a tone" and the doppler shift changes the tone's frequency" did't get it.....Is it present in the electronics -lab project???
  20. M

    Digital radar speedometer

    (free running oscillator in the display circuit) Can u point me where? the laser diode is receiving only the reflected frequency???? Doesn't it get mix with the transmitted frequency in air? If we have two inputs with different frequncies,is there any way that we get their difference???? how...
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