[Lab] FM Broadcasting

Andrew Plumb andrew at plumb.org
Wed Aug 11 11:36:37 EDT 2010


A slightly more custom option which would allow for a proper antenna (which matters more than absolute power numbers) is this SparkFun break-out board:

FM Radio Module Breakout Board - NS73M: http://www.sparkfun.com/commerce/product_info.php?products_id=8482

It has SPI and I2C interfaces so you can control it however you like.

Andrew.

On 2010-08-11, at 11:27 AM, Ryan Stec wrote:

> Yes, I did mean Very Very Low Power FM Broadcasting. It's for a project where we will be programming lights for a sculpture and syncing sound to the lights. The sound will be broadcast over the transmitter so that people can tune in and connect them both. It is kind of proof of concept project so that I can try and get some public art applications in somewhere.
> 
> Andrew, do you mean like something used to broadcast a signal to your car stereo like a Belkin or something? I think they are a little too low power, really only a 10 feet max probably.
> 
> Decade makes pro products that do 80 milliwatts that could be used in warehouses, etc., and would be fully legal. 
> 
> The HLLY unit is 500milliWatts, and so doesn't really fit the CRTC standards but would be more fun to use for a variety of applications. My friend who recommended it runs it without the antenna attached to get a low power signal for about a 500m radius, and more like a few Km with the antenna on.
> 
> Yes, I will be at the Mod Lab tonight. Looking to get out of the heat of my non-AC apt ;)
> 
> cheers
> r
> 
> 
> On 2010-08-11, at 11:13 AM, Andrew Plumb wrote:
> 
>> Hey Ryan,
>> 
>> Did you mean very very low power FM broadcasting on standard radio FM frequencies?  That's what that box appears to do, not VLF which is used for things like submarine comms - http://en.wikipedia.org/wiki/Very_low_frequency
>> 
>> If it's standard FM frequencies, just find an off-shelf automotive transmitter to hack.  They're much cheaper and ubiquitous.
>> 
>> Aside: going to be at ModLab this evening?
>> 
>> Andrew.
>> 
>> On 2010-08-11, at 11:04 AM, Ryan Stec wrote:
>> 
>>> Hello,
>>> 
>>> Was wondering if anyone had any experience with Very Very Low Frequency FM Broadcasting. Am looking into getting a transmitter for a personal project and have had this recommended to me from HLLY:
>>> 
>>> http://www.hllyelectronics.com/html/fm_transmitter_1_96.html
>>> 
>>> I had looked at the Decode ones which is a bit more level equipment, but the MS-Decode 100 goes for near $600 vs $160 for the HLLY.
>>> 
>>> Thanks in advance.
>>> Ryan
>>> 
>>> 
>>> 
>>> 
>>> ---------------------------------------------------------------
>>> 
>>> Ryan Stec
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>> --
>> 
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> 
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