analog&RFmodels
Senior Member

i have a drone w gps - very small antenna. outdoors lock 3-4+ sat usually takes 1-2 minits. indoors (tile roof) often takes 5-6 minits and as jonr says, once it has aquired, i can carry it inside no problem

a friend of mine used to produce and sell those 30-40 years ago. as i remember he used a pin diode optical sensor to detect a fast rising or falling edge as the bullet went over the traps. rising light from...