Narrow-band-fm-receiver


Posted on Aug 4, 2012

The local oscillator is crystal-controlled and the i-f swing is hardly compressed. The deviation of the transmitted carrier frequency, because of modulation, must therefore be limited to prevent severe distortion of the demodulated audio signal. The component values result in an i-f of 4.5 kHz and an i-f bandwidth of 5kHz. If the i-f is multiplied ll`f N, the values of capacitors Cl7 and Cl8 in the all-pass filters, and the values of illter capacitors C7, CS, ClO, Cll, and Cl2 must be multiplied by 1/N.


Narrow-band-fm-receiver
Click here to download the full size of the above Circuit.

For improved i-f selectivity to achieve greater adjacent channel attenuation, second-order networks can be used in place of ClO and Cll.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Dynamic to electret microphone circuit
6V to 12V Converter
38KHz or 40KHz signal generator
Line signal to phono adaptor circuit
Rain alarm-door bell
Radio Circuits
Oscillators
Ridiculously Simple AVR AM Radio Transmitter
High performance amplifier CD Walkman -TDA1308



Top