28 Feb
2010
28 Feb
'10
12:06 a.m.
On Saturday 27 February 2010, Tim E. Real wrote:
On February 27, 2010 07:50:07 pm Gordon JC Pearce
wrote:
Build it. In 1975, RCA was making an IC for the FM detector that claimed
<0.1% distortion and at least a 60db SNR for tv and fm radio rx use, the
type CA3089-E. They were about $3 the last time I bought a onsie. 14 pin
dip package. I would imagine that even better integrated circuits are
available today for that. That one needed a superhet front end that could
give it 400 microvolts to achieve that <0.1% THD, and delivered about 400
millivolts of audio.
--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
When God endowed human beings with brains, He did not intend to guarantee
them.
On Sun, 2010-02-28 at 01:41 +0100,
fons(a)kokkinizita.net wrote:
I read about this in Nuts And Volts magazine.
They describe in some detail how SDR works and neat DSP techniques
in general.
I searched the web but could only seem to find Windows related stuff.
Some more Linux stuff would be cool.
One still needs to build or buy a front-end first though, right?
Tim. On Sun, Feb 28, 2010 at 12:40:00AM +0000, Gordon
JC Pearce wrote:
Software-Defined Radio. Basically you downmix incoming RF to the audio
range with two mixers fed 90 degrees out of phase. You can then munge
this in various different ways to tune and demodulate various different
radio signals.
Gordon MM0YEQ
_______________________________________________
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Linux-audio-dev(a)lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-dev I wanted a very simple SDR with jack inputs and
outputs for a
demonstration I was doing. I had a look at the DSP guts of dttsp and
quisk, and sat down to code.
Forgive my ignorance, but what is an SDR ?