Hello Rik,
you wrote:
Hello Wolf,
a very nice setup.
One question about the FM-link: is the dynamic range sufficient ?
To take full advantage of a 16 bit ADC (soundcard) the dynamic rang of the FM
linl should exceed 96dB.
The receiver's dynamic range certainly isn't adequate for a 16-bit ADC.
At the moment (with a kenwood TH-F7, certainly not "HiFi") it seems to
be somewhere between 60 and 70 dB. Difficult to measure because it's
frequency dependent (FM pre/de-emphasis). The gain (at the FM tx) was
adjusted until the sferics only caused occasional clipping, and the
background hiss from the UHF-RX just becomes audible.
Unfortunately the wireless lan doesn't work reliably enough at the
remote site; if it did, the 'streaming PC' would be at the RX site.
Cheers,
Wolf .
P.S: As expected, there was auroral chorus on VLF this morning. Sounds
like frogs, toads, and birds. Paul Nicholson's automatic detector caught
some of them, and saved a few seconds per event in a wave file. The
spectrograms can be seen as thumbnails, and wavefiles can be downloaded
from here (you may have to select 'earlier events', since most of the
events are normal whistlers ):
http://abelian.org/vlf/events.php?stream=vlf6
or, for comparison, Paul's own stream in Todmorden, UK:
http://abelian.org/vlf/events.php?stream=vlf1
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