[NJARC] A $40 Software-Defined Radio - IEEE Spectrum

[Mike Feher]

I actually built my first SDR back in the very early 1970's. The first one
used IIR (infinite impulse response, recursive) digital filters and serial
arithmetic. The next iteration that went into production used FIR (finite
impulse response, non-recursive) filters. We used DDS (easy to use for I & Q
channels) for tuning and FFT for signature analysis of recovered submarine
signals. This was for the Navy's ASW fleet, at the time mostly installed in
the P3-C aircraft, and later aboard helos (LAMPS) and subs. Amazing what
they can do now. Certainly have come a long way. 73 - Mike 

Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960 

-----Original Message-----
From: njarc-bounces at mailman.qth.net [mailto:njarc-bounces at mailman.qth.net]
On Behalf Of Al Klase
Sent: Sunday, December 29, 2013 11:21 AM
To: njarc at mailman.qth.net
Subject: Re: [NJARC] A $40 Software-Defined Radio - IEEE Spectrum

Just remember
Reply = Poster
Reply All = Everyone

_________________________________________________________
Hi Joe,

Thanks for the link. The video is a good introduction to thia subject.

I've been messing around with these "dongles" for a while now. In fact the
last three I bought were 9 bucks a pieces, shipped, from China of course,
via E-bay. They actually work fairly well, especially when you consider that
there's virtually no money involved. You need to buy or build an
up-converter if you want to tune below the bottom limit of the dongles
frequency range which is something like 24 MHz.

There are a number of free software packages available. My current favorite
is SDR-Console Version 2. http://v2.sdr-radio.com/ Stuff like this even
decodes FM stereo. There's some potentially confusing software-geek things
that need to be done to get the proper drivers loaded so the PC can talk to
the radio, but it's not too time consuming.

I've had a lot of fun exploring software-defined radio. Talk to me if you
need help.

Best regards,
Al

On 12/29/2013 10:14 AM, TrainBee at aol.com wrote:
> Just remember
> Reply = Poster
> Reply All = Everyone
>
> _________________________________________________________
> This was sent to me from the Yahoo Heathkit users group.  The  
> technology here exceeds my current abilities, but I'm sure there are  
> members here who understand it.
>   
> Here is the link to copy and paste
>   
>                       
> http://spectrum.ieee.org/geek-life/hands-on/a-40-softwaredefined-radio
>   
>      I understand it will not tune below 25 mHz with a  modification.
>   
> Happy New Year to all.
>   
> Joe Devonshire
> ______________________________________________________________
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--
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

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