[Elecraft] K3: DRM listening?
David Pratt
david at g4dmp.fsnet.co.uk
Fri Dec 11 17:12:29 EST 2009
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 this was by converting the 455kHz i.f. to 12kHz.
David G3DMP
In a recent message, Lyle Johnson <kk7p at wavecable.com> writes
>
>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 still requires modifications to the K3.
>
>Some DRM decoders are free, others require a licensing fee.
>
>WinDRM is different, being a mode designed for Amateur radio use,
>primarily for digital voice but also for file transfer.
--
David G4DMP
Leeds, England, UK
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