Radio Tuning

[Roy Ingham]

Hi All

Where or What is the formula to calculate Radio Frequencies?

Variable Capacitor (I assuming) as the tuning dial, then what
give you the range of Freq to tune into. Yes I'm wanting to
start my first electronics project and would like to build a
simple yet effective radio, driven on a 9V battery.

Also Automatic tuners or scanners found on modern car radios
do, these detect the strongest Voltage / ? to determine that
the current frequency is a good channel to lock into. You
know you press the button and the radio runs through the
stations, and stops at some point. Missing some stations.
What makes it stop a detection in strong voltage or what ??

Thanks in advance
B

 

[Tom Biasi]

"Roy Ingham" <brif8@hotmail.com> wrote in message
news:9n3le.68816$IO.29349@tornado.tampabay.rr.com...

Hi All

Where or What is the formula to calculate Radio Frequencies?

Variable Capacitor (I assuming) as the tuning dial, then what
give you the range of Freq to tune into. Yes I'm wanting to
start my first electronics project and would like to build a
simple yet effective radio, driven on a 9V battery.

Also Automatic tuners or scanners found on modern car radios
do, these detect the strongest Voltage / ? to determine that
the current frequency is a good channel to lock into. You
know you press the button and the radio runs through the
stations, and stops at some point. Missing some stations.
What makes it stop a detection in strong voltage or what ??

Thanks in advance
B
A capacitor and an inductor form a resonant circuit.

There are other ways to tune. The example that you give is digital tuning.
Look here first and do some research.
http://web.ukonline.co.uk/b.gardner/Theradio.html

Good Luck,
Tom