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(Indiegogo)   Subby is trying to build a low-cost weather data and emergency broadcast receiver for geeks and not-so-well-funded emergency response groups. Help?   (indiegogo.com) divider line 11
    More: Interesting, EMWIN, Microsoft Windows, wide receiver, weather  
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267 clicks; posted to FarkUs » on 10 Dec 2012 at 9:37 PM (1 year ago)   |  Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»



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2012-12-10 08:53:45 PM
There's an app for that....
 
2012-12-10 09:16:16 PM
http://crank-radio-review.toptenreviews.com/

Why are the friggin' commercial demodulators so expensive? That's really the only component I can't seem to find on the cheap anywhere.
 
2012-12-10 10:38:37 PM
Can't you still get an almost complete DSP FM receiver on a chip that needs just a few external components?
 
2012-12-10 11:09:48 PM

KarmicDisaster: Can't you still get an almost complete DSP FM receiver on a chip that needs just a few external components?


Subby here.

What I'm proposing is not another NOAA weather radio. There's tons of those on the market everyday and, in fact, there are single chip receivers that can directly receive the 160Mhz radio signal and decode the S.A.M.E data.

The problem with those systems is that all they do is alert you when the feces is about to hit the air circulator.

What I have in mind is a system that listens to the EMWIN broadcast transmitted from the GOES satellites at 1691Mhz. It is not dependent on terrestrial internet, or even NOAA weather radio broadcasts. This is a system that still operates even if the local NOAA towers have been blown over or have lost power. It is a system that will, hopefully, be either fixed mounted or stored somewhere safe and then set up if the need arises.

See also: http://www.nws.noaa.gov/emwin/index.htm
 
2012-12-10 11:23:42 PM
I have an EZTV dongle with the Elonics chipset for about $25 on ebay. picks up everything from 64-2200Mhz. it'll be perfect for your project. if you search a bit you'll see people are even grabbing SSTV images of GOES imagery realtime. one of these plus a DIY discone antenna should do what you want. RTL-SDR is the term you should be searching on.

OsmoCom
subreddit
gnuradio
 
2012-12-10 11:53:51 PM
When I was a child, we had these things called television sets. Sometimes they would show the weather.
 
2012-12-11 12:01:59 AM

papercut: I have an EZTV dongle with the Elonics chipset for about $25 on ebay. picks up everything from 64-2200Mhz. it'll be perfect for your project. if you search a bit you'll see people are even grabbing SSTV images of GOES imagery realtime. one of these plus a DIY discone antenna should do what you want. RTL-SDR is the term you should be searching on.

OsmoCom
subreddit
gnuradio


The wife bought me an EZTV dongle for Christmas. I'm going to try it out as well.
 
2012-12-11 02:29:31 AM
From my reading, the eztv dongles are kind of deaf and have some serious frequency stability and phase noise issues. Not good when you're trying to latch on to a narrowband signal.

The MAX2121 tuner chip I want to use is pretty solid in those regards.

Oh, and you won't pick up these signals with a discone antenna. They come from geosync birds. It's the TIROS-N birds at 137mhz you can grab with a discone.
 
2012-12-11 10:07:58 AM
That has to be the lowest goal indiegogo campaign ever. However, this:

"If my design is successful, 3 $100 contributors will receive a fully operational receiver, no matter what the final cost is."

seems to imply that if your design isn't successful, those three contributors get bupkis.

Care to clarify?
 
2012-12-11 10:27:03 AM
Would a handheld unit with lcd display be adequate? We really need at least some rough design specs.
 
2012-12-12 04:02:03 PM
upload.wikimedia.org

If you need to communicate with someone regarding a weather emergency, throw the rock at him.
 
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