FM Radio Project - autoscan question

Projects General Guidance
1

Greetings All, I am looking at building a FM radio that will scan, in sequence, across the entire FM band without stopping, and I want to be able to hear all noises to include an white noise (so think of a continuous sweep from the lowest frequency to the highest). I have yet to find any code that will do it in sequence without stopping. I'd also want to ty and do it in the reverse (from highest frequesncy to lowest). Anyone know if this is possible or have any ideas on coding to accomplish this? Thanks in advance!

2

You could look at software Defined Radios as a starting point. It sounds like it should be possible but probably not with an Arduino.

3

There exist a number of FM radio receiver chips/breakout boards which can be controlled via SPI or I2C interfaces.

For example: SparkFun FM Tuner Evaluation Board - Si4703 - WRL-12938 - SparkFun Electronics

As noted by "ardly" software defined radio (SDR) is another way to go, but generally requires significantly more than microcontroller class back end processing. https://www.rtl-sdr.com/about-rtl-sdr/

4

MrMark:
There exist a number of FM radio receiver chips/breakout boards which can be controlled via SPI or I2C interfaces.

For example: SparkFun FM Tuner Evaluation Board - Si4703 - WRL-12938 - SparkFun Electronics

That is neat, live an learn.

5

drbell76:
Greetings All, I am looking at building a FM radio that will scan, in sequence, across the entire FM band without stopping, and I want to be able to hear all noises to include an white noise (so think of a continuous sweep from the lowest frequency to the highest). I have yet to find any code that will do it in sequence without stopping. I'd also want to ty and do it in the reverse (from highest frequesncy to lowest). Anyone know if this is possible or have any ideas on coding to accomplish this? Thanks in advance!

Noise is AM, amplitude modulation, you will NOT hear that on an FM radio.

Paul

6

Noise is noise.
The output of a FM discriminator or quadrature detector produces noise with a triangular power spectrum.
Its normally not heard simply because FM receivers have a squelch which cuts off the noise from being heard, but its still there.

7

Hi,

Are you trying to make a "spirit box" or "ghost radio" ?

Tom..... :o