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

ATMEL 89C Series Flash Programmer
Touch Switch
Diode feedback comparator
Coffee bits and bikes: Mini85
Nixie low voltage PSU
audio peak level indicator by op amp
Schematic Diagram Electronic FM Telephone Transmitter Circuit
Wireless mains voltage tester
Automatic street light circuit
Catching the Falling Drop
Neutralizing Amplifier
Double astable multivibrator circuit diagram
Light control principle circuit rooster crows
Corridor counter delay circuit for controlling lights



Top