raymonda58 wrote:
> At the following URL: http://www.rfspace.com/demo.html you can find 7
> .wav files recorded off the air that may be listened to with SDRadio
> or other SDR receivers. These files contain IQ baseband signals
> signals.
>
> 6 of the files are about 15 second clips of various bands and modes
> (10 meters, EME, AO-40, SSB echos, 6 meter contest, etc. One of them
> is about 135 MBytes (zipped) and contains obout 5 minutes worth of 20
> meters (150 kHz BW starting at 14.225 MHz). They were recorded from
> the SDR-14 receiver marketed by RFSpace Inc. at a 66.667 MHz sampling
> rate, mixed down to baseband and interfaced to a PC via a USB link.
> The SDRadio can listen to about 24 kHz of the 150 kHz recorded
> bandwidth.
>
>
> -Ray WB6TPU
Why only 24 kHz ? With the latest version, released a couple of months
ago, you can choose
96 kHz as sampling rate (of course, if your sound card supports it), for
a band coverage from
-48 to +48 kHz, total 96 kHz. Of course also the recording must have
been done at 96 kHz,
and this probably is the reason why...
I was last Sunday at the 14th Italian EME Conference were I presented
some concepts of the
software defined radio technology, and I brought with me a CD where I
had recorded half an hour
of the segment 7000 - 7096 of the 40m band, at 96 kHz sampling rate,
with both I and Q components.
That allowed me to show how easy is to interactively tune the wanted SSB
or CW stations, and to
adjust dynamically the filter shape and width to your needs. I would
like to place that CD online, but
it is more than 650 MB, so...
73 Alberto I2PHD
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/soft_radio/
<*> To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
