Hi,
You could try tapping the IF out of an old radio (which uses FETs) . But
you will need a mixer and band pass filters to bring the signal down to
a range which your soundcard can handle.
Regards,
Ram
Get a softrock 40. I/Q sampler based on the quadrature sampling
detector
(fully balanced. Virtual ground, thus not Tayloe). High performance,
good
sensitivity. Yields I/Q in stereo audio for baseband processing. If
you
already have a USRP, get the LFRX.
Frank B. and I wrote the SDR core for the software in the GUI shown
in
the second link (PowerSDR).
Bob McGwier
ARRL SDR Working Group Chair
Member: ARRL, AMSAT, AMSAT-DL, TAPR, Packrats,
NJQRP, QRP ARCI, QCWA, FRC.
“Trample the slow … Hurdle the dead”
From: discuss-gnuradio-bounces+rwmcgwier=removed_email_address@domain.invalid
[mailto:discuss-gnuradio-bounces+rwmcgwier=removed_email_address@domain.invalid] On Behalf
Of
sriram s
Sent: Tuesday, September 02, 2008 12:33 AM
To: [email protected]
Cc: gnu radio
Subject: [Discuss-gnuradio] Re: gnu radio with a soundcard
Hi,
You could try tapping the IF out of an old radio (which uses FETs) . But
you
will need a mixer and band pass filters to bring the signal down to a
range
which your soundcard can handle.
Regards,
Ram
On Sat, Aug 30, 2008 at 11:25 PM, Mathew George <[email protected]
http://us.mc592.mail.yahoo.com/mc/[email protected]
wrote:
Hi all,
Can someone explain how we may build a FM/SW receiver using A/D D/A
converter in a sound card and minimal additional hardware? Somewhere I
have
read that this is possible, in principle, but could not yet gather info
suitable for a novice.Thanks for the help.
Cheers,
Mathew
Movies, sports & news! Get your daily entertainment fix, only on
http://live.com live.com Try
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Discuss-gnuradio mailing list
[email protected]
http://us.mc592.mail.yahoo.com/mc/[email protected]
Hi all,
Thanks for the responses, so far.
Yesterday I came across the elektor project on SDR via USB and
soundcard, at -
http://www.elektor.com/magazines/2007/may/software-defined-radio.91527.lynkx
. All the details including the necessary software is freely
downloadable, from the Elektor website.
This seems to be fully functional in 150 kHz - 30 MHz band, and needs a
supported sound card, for its operation. Pre-assembled boards costs
about 110 euros (tested units from Elektor), where as one can consider
building the unit on his own tor educe the costs. Pre-fabricated PCBs
for this project is available for 28 euros or so per piece.
Can someone comment, whether it is possible to make the unit working
with GNU radio? If the answer is yes, how to proceed? What would be the
first steps?
Thanking you,
Mathew George
From: [email protected]
To: [email protected]; [email protected]
CC: [email protected]
Subject: RE: [Discuss-gnuradio] Re: gnu radio with a soundcard
Date: Tue, 2 Sep 2008 00:45:05 -0400
Get a softrock 40. I/Q sampler based on the quadrature
sampling detector (fully balanced. Virtual ground, thus not Tayloe).
High
performance, good sensitivity. Yields I/Q in stereo audio for baseband
processing. If you already have a USRP, get the LFRX.
Frank B. and I wrote the SDR core for the software in the
GUI shown in the second link (PowerSDR).
Bob McGwier
ARRL SDR Working Group Chair
Member: ARRL, AMSAT, AMSAT-DL, TAPR, Packrats,
NJQRP, QRP ARCI, QCWA, FRC.
“Trample the slow … Hurdle the dead"
From:
discuss-gnuradio-bounces+rwmcgwier=removed_email_address@domain.invalid
[mailto:discuss-gnuradio-bounces+rwmcgwier=removed_email_address@domain.invalid] On Behalf
Of sriram
s
Sent: Tuesday, September 02, 2008 12:33 AM
Cc: gnu radio
Subject: [Discuss-gnuradio] Re: gnu radio with a soundcard
Hi,
You could try tapping the IF out of an old radio (which uses FETs) .
But you
will need a mixer and band pass filters to bring the signal down to a
range which your soundcard can handle.
Regards,
Ram
On Sat, Aug 30, 2008 at 11:25 PM, Mathew George
[email protected]wrote:
Hi all,
Can someone explain how we may build a FM/SW receiver using A/D D/A
converter in a sound card and minimal additional hardware? Somewhere
I
have
read that this is possible, in principle, but could not yet gather
info
suitable for a novice.
Thanks for the help.
Cheers,
Mathew
Movies, sports & news! Get your daily entertainment fix, only on
live.com
Try
Discuss-gnuradio mailing list
On Thu, Sep 18, 2008 at 07:39:40AM +0000, Mathew George wrote:
This seems to be fully functional in 150 kHz - 30 MHz band, and needs a
supported sound card, for its operation. Pre-assembled boards costs about 110
euros (tested units from Elektor), where as one can consider building the unit
on his own tor educe the costs. Pre-fabricated PCBs for this project is
available for 28 euros or so per piece.Can someone comment, whether it is possible to make the unit working with GNU
radio? If the answer is yes, how to proceed? What would be the first steps?
Hi Mathew,
I haven’t tried it myself, but this board (and similar ones) has been
used a lot
together with the Dream DRM receiver (http://drm.sourceforge.net/).
There are two types of these receivers (you’ll have to check the details
yourself): the standard type works just like an HF AM receiver and
downconverts any signal up to 30MHz into the audible band (center
frequency around 6-12 kHz). You simply plug the output signal into the
line-in connector of your sound card and (in GNU Radio) use the
audio.source-block to start the DSP chain. Other receivers actually
downconvert to complex baseband and put the I and Q paths on the L and R
inputs, which just means you take the same source and connect it to a
real-to-complex GR block, but I haven’t seen this work myself.
Sound cards have some quirks when (ab-)using them for this kind
of stuff (highpasses for DC-filtering, for example). Chances are very
high
you will need a new soundcard anyway.
The main consideration is the limited bandwidth: even high-end
soundcards have ADCs running at no more than 96kHz, and due to some
audio-specific processing you won’t be able to use the full bandwidth
(it’s best to put the lower frequency not too close to 0Hz), so you’ll
be limited to HF bands (AM broadcasting, DRM, HAM Radio etc.).
The HF-receiver-to-soundcard is not uncommon among HAM folk and used for
packet radio, PSK31 and likewise. You will find tons of
documentation for this on the nets, and the Dream website is a good
place to start (receiving OFDM is a lot more demanding concerning the
hardware than PSK31, so if you can listen to DRM your receiver is OK).
Your receiver setup will be limited to small bandwidths and low
frequencies, though.
Regards,
mb