Hew,
Do you recall what the hardware mods were? I'm wondering if I can
clean up card with caps here and there. I looked at your sine wave
data. I low pass filtered it and got rid of most of that garbage. The
tone is at 1890 Hz as far as I can tell. How did you generate that
tone and what was the center frequency? Where did you inject the tone?
-Jim
Hew How Chee wrote:
Hi Jim,
The card I use last time is PV-TV304P+ (REV .2B) with FMRC (FM and
Remote Control) . The chipset used is CX23881. The card from newegg.com
is using CX23883. Can't tell it is compatible or not. The data I got is
8 bit unsigned. Didn't try out 10 bit since I was quite dissapointed by
the noise in the 8 bit digitized signal. Nevertheless, it is still
possbile to digitize the 10.7 MHz FM IF with hardware mods.
Note that the source code at
http://www.geocities.com/how_chee/cx23881.htm can't compile and run in
Linux kernel 2.6 and is not hooked up to GNURadio. It was developed
using Knoppix Live CD 3.4 running kernel 2.4.x.
Best regards,
Hew
Jim Perkins <address@hidden> wrote:
Hew,
Aren't you the guy how figured out how to get the ADC data from the
CX23881 card into the PC? I found your website http://www.geocities.com/how_chee/cx23881.htm
and looked at the data. I think I'm going to get one of these cards to
play with. What model number do you have? I can find PROLINK
PV-TV304P+FMRC for $30 at newegg.com. The Prolink website says it's 8
or 10 bits so I'm wondering if that is the right card.
-Jim
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