Hello Giorgio,
This is very good news. I'm looking forward to your progress.
BTW many MF stations would be happy to have a CW sked on MF with IQ2MI,
if possible :-)
For MF i have built a DC receiver but it is still not optimised because
the band is still splitted. If i would optimise the filters then i would
have no chance to receive stations on 502 kHz or on 501.3 kHz :-) So
that, and the publication of the final schematic, has to wait a bit.
It depends on what is your goal: Simply having a receiver that does the
job or the goal to have a completely homemade receiver. If you only want
to receive then one of the new cheap SDR receivers will be an easy
solution. A frontend has to be added though. Others may have better
advice on that.
For 137 kHz i'm using this RX:
https://dl.dropbox.com/u/19882028/LF/DK7FC%20LF-p%20RX%20converter.jpg
G4WGT is using a modification of that circuit on his grabber. And there
is the kit of JA8SCD,http://icas.to/e/ The IDC-136 is used by TF3HZ and
YV7MAE for example.
For VLF you already have a receiver, your soundcard! Here you only need
to connect an antenna. I'm using this one
http://www.iup.uni-heidelberg.de/schaefer_vlf/8,97kHz%20active%20E%20field%20antenna%20by%20DK7FC.jpg
73, Stefan/DK7FC
Am 09.08.2012 17:45, schrieb IZ2JGB:
Hello group!
After The esperiment with The 500khz
IQ2MI beacon it's now time to build a suitable receiver / grabber.
I'll like to start with The 480 / 500 khz,
Then adding The 137 and maybe
The vlf ( 0 - 20 )
Any good / new ideas to start with ?
Thanks
IZ2JGB
Giorgio
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