Does anyone remember those Rocky Mountain Radar “Phazer” radar jammers? I think they still make them, which is pretty funny. Anyway… many many years ago I actually purchased one of these things which has since been sitting in a pile of crap in my personal junkyard (i.e. my house). I ran across it today while cleaning some stuff up & I figured I’d crack it open to A) see if there were any good parts inside and B) to try & see if the thing is just some blinking LED’s or if they actually made an attempt at getting the thing to actually work.
So that brings me to the question… I’ve cracked the thing open & if I post the schematic up here can anyone help give me a rough analysis of if the circuit actually does anything & also what some of the parts are???
M74HC74 - high speed CMOS DUAL D TYPE FLOP WITH PRESET AND CLEAR
74HC02N - Quad 2-Input NOR Gate
78L05 - Voltage Regulator
NPN2222A - Duh…
1 IR Detector
1 IR LED
Then there is also this big cone shaped metal thing which appears to be a waveguide horn antenna. Is there any way to determine the frequency this antenna is designed for by measuring it’s dimensions?
A friend explained to me a long time ago how they worked sort of.
It involved receiving the incoming signal, mixing it and sending an amplified version back that is mixed with some noise so that it prevents the radar showing a lock.
Without radar into it, the only thing output is the noise which is below the levels that are regulated.
I dont know if the loophole of using the radar as the exciter for the oscilator etc still works however, since I know they test things for RFI exposure to ensure they dont cause any intermodulation products to come out at a problematic level.