Hi Joe,
Am 01.05.2017 16:03, schrieb [email protected]:
Hi Stefan,
Amazing work on ULF. This is very inspring for for someone lamenting
over yet another fried VLF helix.
Thank you :-)
It is easy to lock to NAA and maybe generate a carrier on 8277 Hz?
Yes it is easy. But i would recommend to come on 8270 Hz. You could go
to 8269.9975 Hz regularly. A 'channel' distance of 2.5 mHz has
established since some time now. This frequency is covered by most
grabbers. You will not cause QRM at all. Even if you are strong enough
to be detected here, people would be happy instead of angry.
73, Stefan
During the detection of the far field for the first time on 18 April,
the Alpha stations could be seen in the 11 kHz window. Incidently I
was using the DK7FC VLF probe.
73
Joe
On Mon, 24 Apr 2017, DK7FC wrote:
Hi Joe,
You could generate a separate (maybe locked to NAA) spectrogram from
a local probe to check if everything worked fine from the transmitter
site. I always found my feedback signal from the local tree grabber
most useful, i'm even feeling blind if it is not available :-)
73, Stefan
Am 24.04.2017 15:52, schrieb [email protected]:
I really enjoyed that, Paul. Thank-you.
The ice is finally melting and it may be possible to raise
the aerial this evening. I will advise when the VLF TX is QRV again.
73 to all
Joe VO1NA
On Sun, 23 Apr 2017, Paul Nicholson wrote:
Is that recorded with antenna direct into soundcard
(metaphorically speaking ) ?
Yes. There's no frequency shift, just amplification of
the audio frequencies present on the E-field probe.
Not even that much amplification, on the order of x50 voltage
gain before the soundcard (which needs 4 volts for full scale).
The only post processing is hum notching, 5 pole high pass
at 300 Hz and 3 pole low pass at 10kHz.
--
Paul Nicholson
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