Hello Stefan,

Some people abroad can read German!

Your suggestion regarding Youtube video's is excellent.
My interest is VLF / MF reception and as such SpectrumLab has not 
been my choice as as far as I know it does not feature fast playback 
of IQ recordings. But maybe I am wrong.

Watching one of Leif, SM5BZ's Youtube video's, I found that Linrad 
has such a feature and I have been using it ever since.

I am making Linrad overnight recordings every night from 100 - 600 
kHz and this enables me to playback any channel in this range the 
next day. Playback takes less than 15 minutes and you can set 
reception parameters as you like, making a very flexible system. 
This approach fits in better with my interests than parking one or 
more receivers on a particular channel and using e.g. SpectrumLab or 
ARGO. 

Leif's video's are highly recommended and I have learned a lot from 
it. It takes time, but it is time better spent than running in 
circles trying to make complicated (to the inaugurated) software 
work!

73,
Roelof Bakker, pa0rdt