Now that I'm enjoying SWLing again, I'd like to try to decode Digital
Radio Mondiale. Has anyone succeeded in doing this without buying a
purpose-built DRM receiver?
--
73 -- Brian -- K1LI
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Hi,
Yes, I have been using the K3, LP-Pan, PowerSDR, Virtual Audio Cable and a
free decoder program called Dream. It was quite a while ago and the
experience wasn't that great. The slightest fade and the decoder would lose
the signal. Also, there are precious few DRM transmitters that can be
On Fri, 11 Dec 2009 12:25:40 -0800 (PST), ab2tc wrote:
As you can guess from
my description, it's also quite a few programs that all have to be set up
correctly, none of them being really simple.
Some of the programs you mention would appear to be un-necessary. If the DRM
decoder will work
I am not sure if the 13kHz FM filter is wide enough, but if it is, your
suggestion should work. I didn't have the FM filter at the time. I think
PowerSDR allows 15kHz for its DRM mode and it may have less group delay
distortion than the crystal filter. The decoder is finicky.
Knut - AB2TC
Jim
In general, DRM decoders expect a receiver IF of 12 kHz and a bandwidth
of up to 20 kHz. The K3 can provide neither without modification.
Some DRM modes are narrower and can be accommodated if the FM roofing
filter (nominal 13 kHz) is installed. But getting the IF output to the
DRM decoder
Some DRM modes are narrower and can be accommodated if the FM roofing
filter (nominal 13 kHz) is installed. But getting the IF output to the
DRM decoder still requires modifications to the K3.
DRM decoding with the K3 is easy with the SDR-IQ together with SpectraVue,
VAC and DReaM software.
Could the 8.215MHz output from the IF OUT jack be fed to a simple mixer
with a 8.203 or 8.227MHz crystal to provide a 12kHz i.f.?
I have used this method very successfully on the Sangean ATS-803A and
Lowe HF-225 receivers with both DReaM v.1.6.1cvs and DRM Software Radio
v2.0.38 programs. But
On Fri, 11 Dec 2009 13:07:31 -0800, Lyle Johnson wrote:
In general, DRM decoders expect a receiver IF of 12 kHz and a bandwidth
of up to 20 kHz. The K3 can provide neither without modification.
I'm confused. What 20 kHz bandwidth are we talking about? The output of the
detector? Are you
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