help on DIY radar project???

[DAmp]

Thanks. I Submitted my work and got a good grade. I couldn't do more with other projects and final exams. I want to try this out. I was thinking of buying some diodes and all the parts needed to start the process at least for the laser detector as i doubt i would be able to construct an effective radar detector with my knowledge thus far. I have almost 24hr access to circuit labs so i should have everything i need to test it out in a lab and then put it all together on a car for testing.

One thing that puzzles me and i haven't been able to look into is how the photo-transistors pick up the light. I think its a BJT so the light gets magnified by a gain of Beta i believe and thats 50-300.

So the light causes a less than milli-Ampere current and gets magnified for the circuit to pick it up. I haven't figured out how i tune up the transistors so that they only pick up the laser wavelength, unless they pick up everything and filter after. This would mean, i'm assuming that the sun light would cause another small current for which we would have to compensate during the day, and de-compensate at night.

Hope this is making sense.

[thx1138]

Thanks. I Submitted my work and got a good grade...................Hope this is making sense.

Sorry none of this thread makes any sense......Sounds like you are mixing radar and laser detection with really poor electronics knowledge. I'm all for DIY efforts, but you need to start with a better base knowledge and figure out what you are trying to build as well as why its important.

[DAmp]

Well yeah that is the whole point i'm no expert. I am learning and this was meant to be something that would push the student to learn. If i have poor electronics knowledge then so be it, i will learn. The project was meant to be a laser jammer and also a radar but i did not anticipate the radar to be much more complicated. The design is of a simple radar and if you read the thread you would see it is actually a very old way of implementing radar detection. I dropped doing anything with the radar detection and was trying to build a simple brute force jammer that would perhaps be able to pick up laser so it wouldn't have to be on constantly. I'm not trying to make a commercial grade product just an experiment to see how this works and if it does work.
If i was already a professional and knew everything about this i would not be here. Thank you however for the comment.

[alpinestars_2002795]

Yes I have been looking for the same thing myself. I also have multisim. I have multisim pro 13 and am looking for a decent Radar simplex emitter circuit. I have already passed ELE-120 ELE 130 and am in ELE 165 AC circuits. So I am perhaps a little behind the following. Though my question is very simplex. If i merely purchased a gunn diode at the proper Freq etc. And juiced the Gunn diode with the proper I or Current and V Voltage drop would the Gunn diode emit an small but detectable microwave presence? Would it be nothing at all. Is there far more to this? Must i put in the mixer, and Duplexor, Modulator ic's etc.? Or would this work like a simple Rectifier diode in a AC circuit. Could I just place a Diode in series with VCC to Ground to form a single path and if electrolized would this create a microwave field at that resonant frequency or is there far more depth to this? Do I need an OP Amp to boost the output gain? Or would a simple nominal 5VDC be enough? Thank you in advance. BTW I do have a scope in Multisim 13 pro Though It does only go up to 100MHz. Thus this isn't of much help in that respect. Perhaps the Freq counter would be of better help, then define period based on 1/f=t between phases leading zero going positive edge...?


Alpine-