Hello Roelof, Stefan, and the group,
I have a Perseus, but don't use it for VLF due to the input filters, so
cannot comment on its performance there.
What I did use for "portable" operation (before discovering the 96 kHz
soundcard in my Ideapad S10 netbook) was an SDR-IQ (which has a much
lower lower cutoff frequency than Perseus), or an E-MU 0202.
No visible difference comparing all these in the "upper" VLF spectrum,
though. It's much more important to have an very 'linear' input preamp
at the antenna, or -if that's not sufficient- a preselector. Living less
than 100 km away from DHO38, their signal dominates even the local
'transmitters' on 15.626 kHz ;-)
See http://www.qsl.net/dl4yhf/vlf_rdf/latest_vlf_spectra.htm for some
examples. Most of these spectrograms (especially the 'RDF' ones) were
made with the E-MU. The E-field & H-field comparisons were made with the
SDR-IQ.
Cheers,
Wolf .
Roelof Bakker schrieb:
Hello Stefan,
The external soundcard is a EMU 0202 USB.
To be honest, I have not looked in depth on its performance as VLF
receiver, as I own a PERSEUS SDR and have no need for it.
I believe that Wolfgang, DL4YHF also uses one for his remote VLF
reception station.
Maybe he can comment on the performance.
73,
Roelof
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