Quote:
Originally Posted by zakari
hi franco
you are right i have made some handmade fm transmitter circuit but saturates the sensor intrance signal and unstable the transmitter frequency
i use below pll fm t module adjusted distance transmitter and receiver circuit to avoid the saturation signal
i transfer pp key of module on the box to adjust the frequency of transmitter
best regard
zakari
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Thank you for the information, I also invite other members to experiment. The fact that two equal frequencies arrive at the mixer (TR2 base) makes it much more sensitive. With the 20Mhz oscillator my idea was just this, that is to tune L1C / 10 on a harmonic of the oscillator. But even in this case the signal is too strong and unstable.