DRM
 

Anyone tried listening to DRM broadcasts on shortwave? If so, what
sort of quality did you get, and what equipment did you use?

Just curious; the curious chap that I am. :-)

A schedule of DRM transmissions -
http://www.drm.org/livebroadcast/centrlivebroadcast.htm





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Check out the DRM section of my web site for some sample audio clips.

http://www.sillett.us

Bob Sillett, N3OEA



"Ian Smith" wrote in message
. ..
Anyone tried listening to DRM broadcasts on shortwave? If so, what
sort of quality did you get, and what equipment did you use?

Just curious; the curious chap that I am. :-)

A schedule of DRM transmissions -
http://www.drm.org/livebroadcast/centrlivebroadcast.htm





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"-=jd=-" wrote in message
...
On Sat 04 Sep 2004 06:40:25p, "Ian Smith"

wrote in message :

Anyone tried listening to DRM broadcasts on shortwave? If so, what
sort of quality did you get, and what equipment did you use?

Just curious; the curious chap that I am. :-)

A schedule of DRM transmissions -
http://www.drm.org/livebroadcast/centrlivebroadcast.htm




I was able to get an occasional 10 second (or so) stream decoded
with the
Dream software and an unmodified PCR1000. To me it was crystal
clear, well
modulated - I would have to say better than FM quality. In my case,
I had to
experiment with the software configuration and tune the stream USB a
bit.
IIRC, this was for the broadcast out of Bonaire by RNW.


-=jd=-
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(Remove YOUR HAT to reply directly)

Thanks for that, JD. I hope to acquire some sort of DRM setup
early next year.





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"spytromics" wrote in message
...
Check out the DRM section of my web site for some sample audio
clips.

http://www.sillett.us

Bob Sillett, N3OEA


Thanks Bob. I listened to some of your recordings; very
impressive. Looks like I'll be dabbling in DRM within a few months.
Apparently, there is an upgrade available for my AR7030, but the 2
spare filter sockets are used up in the process, meaning the one I
added would have to come out to make way for DRM, leaving only the 4
factory-fitted defaults available. Will need to think about it.
Good DX.

Ian Smith, Clydebank, Scotland.





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Ian Smith schrieb:

Apparently, there is an upgrade available for my AR7030, but the 2
spare filter sockets are used up in the process, meaning the one I
added would have to come out to make way for DRM, leaving only the 4
factory-fitted defaults available. Will need to think about it.

An extensive mod is not needed for the AR7030, since its "9.5 kHz"
position is wide enough. All that's needed is a downmixer with f_mix =
467 kHz to be attached to the receiver's 455 kHz IF output.

Stephan
--
Meine Andere Seite: http://stephan.win31.de/
PC#6: i440BX, 1xP3-500E, 512 MiB, 18+80 GB, R9k AGP 64 MiB, 110W
This is a SCSI-inside, Legacy-plus, TCPA-free computer :)

"Stephan Grossklass" wrote in message
...
Ian Smith schrieb:

Apparently, there is an upgrade available for my AR7030, but the 2
spare filter sockets are used up in the process, meaning the one I
added would have to come out to make way for DRM, leaving only the
4
factory-fitted defaults available. Will need to think about it.

An extensive mod is not needed for the AR7030, since its "9.5 kHz"
position is wide enough. All that's needed is a downmixer with f_mix
=
467 kHz to be attached to the receiver's 455 kHz IF output.

Stephan
--
Meine Andere Seite: http://stephan.win31.de/
PC#6: i440BX, 1xP3-500E, 512 MiB, 18+80 GB, R9k AGP 64 MiB, 110W
This is a SCSI-inside, Legacy-plus, TCPA-free computer :)

Interesting, Stephan. I wonder where to get more technical information
on this.





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Ian Smith schrieb:

"Stephan Grossklass" wrote in message

An extensive mod is not needed for the AR7030, since its "9.5 kHz"
position is wide enough. All that's needed is a downmixer with f_mix =
467 kHz to be attached to the receiver's 455 kHz IF output.

Interesting, Stephan. I wonder where to get more technical information
on this.

There are two documents available at
http://www.drmrx.org/receiver_mods.html which should get you a lot
further already. The Fraunhofer mod was quite a bit more complex, but
the document contains a nice mixer circuit (a more inexpensive version
of which is discussed in the second document). Here in .de a finished
mixer board as sold by Sat-Service Schneider
http://home.t-online.de/home/sat-service/sat/DRM/DRM.htm is quite
popular, mostly in the crystal version. Very small thing it seems (thus
popular for portable rx mods), and they've got a PDF with the circuit,
too. All you'd need in addition to that would be a small case with a 3.5
mm headphone jack and a cable (as short as possible) with a matching DIN
plug for the IF output jack.

Stephan
--
Meine Andere Seite: http://stephan.win31.de/
PC#6: i440BX, 1xP3-500E, 512 MiB, 18+80 GB, R9k AGP 64 MiB, 110W
This is a SCSI-inside, Legacy-plus, TCPA-free computer :)