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Topic: FM Radio Shield (DIY). (Read 3031 times) previous topic - next topic

Magician

Oct 25, 2012, 06:36 pm Last Edit: Oct 25, 2012, 06:48 pm by Magician Reason: 1
Arduino Uno, proto-board,few resistors and cheap radio from local convenience store, thats all you need to build FM radio shield.

Capabilities:

- auto-scan full FM band;
- store/recall  20 radio stations to/from the list (EEPROM);
- print a list of radio stations;
- switching tuner up / down along the list;
- fine tunning;
- calibration of heterodyne VCO, using RF broadcasting data as high accuracy Signal Generator;
 (Least Squares based 2-nd degree polynom fitting, about +-0.1 MHz or 0.1% precision);
- debug Command Line Interface.

Check it out: http://coolarduino.wordpress.com/2012/10/21/diy-arduino-fm-radio-shield/


april

#1
Oct 31, 2012, 10:05 pm Last Edit: Oct 31, 2012, 10:22 pm by april Reason: 1
166 views and no posts . !
Well I think what you have is interesting. My interest is in your knowledge of how to scan radio frequencies . Do you know anything about how this might be made to work on other frequencies ,433Mhz , 200Mhz or 20Mhz for instance?
What particular parts would need to be changed and what other matters might be considered? (obviously the receiver, but could a simple receiver be made or bought )

It might have uses in scanning for bugs , and spectrum analysis.

You put in a lot of work to do this and I thank you for posting it.

Magician

I had close to 1.500 visitors on web page yesterday, after references were posted in news/blog sections : http://www.adafruit.com/blog/2012/10/30/diy-arduino-fm-radio-shield/ and
http://www.freetronics.com/blogs/news/6812702-diy-fm-radio-arduino-shield#.UJGc_7Rl9RS
(thanks).
Regarding no posts here, there are at least two reasons:
- topic quite "specific";
- well explained, so no questions  :)
As they say, incorrect statement, usually getting more attention /responses, than well formulated question.
Quote
Do you know anything about how this might be made to work on other frequencies ,433Mhz , 200Mhz or 20Mhz for instance?
IC TDA7088 works over 0.5 - 110 MHz, so it would be quite easy to cover this range. 200, 433 and up needs different chip, I'm sure there are many of similar functionality. Problem to get a BOB ( prototype boards ) which include IC with all peripheral hardware (R/L/C) below $2. May be channel selector from HD box, or an old VHS / TV receiver would be an option.

strykeroz


- well explained, so no questions  :)
FWIW I was a lurker, and that's the reason I didn't.  I did click 'notify' though in case there were any more updates or questions.  :)
As they say, incorrect statement, usually getting more attention /responses, than well formulated question.
I'd not heard that before, but it makes perfect sense !

Thanks for sharing,
Geoff
"There is no problem so bad you can't make it worse"
- retired astronaut Chris Hadfield

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