Subject: AW: VLF: RX stations in Canada and US?
Hi
Joe,
I don't know that RX but what i recommend is using the soundcard
of your PC
(or an external) as the RX, just as Paul Nicholson and Jim and
Wolf and
Markus and Renato and...... did it. You do not need an extra RX.
An extra
usual RX is just a source of frequency instabilities (offset and
temperature
drift). You have to have a very stable frequency, say 8970,00
Hz +- 0,01 Hz.
This can be reached by using your soundcard and e.g.
DL4YHFs Spectrum
Lab(V2.75 b08 or higher versions) and compensating the
frequency drift by
locking to a military reference MSK signal that is
available almost all over
the world.
Then, in a first step you can
watch the ALPHAs on 11904,762 Hz and watch
your accuracy. It should be an
absolutely horizontal line!
Theoretically, this could be tried this
evening :-)
Best 73 and good luck
:-)
Stefan/DK7FC
________________________________
Von:
[email protected]
im Auftrag von
[email protected]Gesendet:
So 06.06.2010 20:38
An:
[email protected]Betreff:
Re: VLF: RX stations in Canada and US?
Hi Bill,
Group.
Just returned from a one week trip inland (Ottawa). Yes,
I'm near St
John's and have acquired an ITT mackay 3031A which might be
satisfactory
for VLF RX. Any comments on the suitability of this RX would
be
appreciated.
73 & TNX
Joe VO1NA
On Sun, 6 Jun
2010, Bill de Carle wrote:
> At 07:45 AM 6/6/2010, Stefan/DK7FC
wrote:
> [..]
>> What about the canadian stations? These are
in the shortest distance to
EU
>> and will become a very
important factor in some months when the QRN
levels
>> decrease.
Are there already stations who permantently monitor
the
dreamers
>> band (not the whole VLF) with a suitable RX
system? Means, not only
copying
>> the ALPHAs by ear but having
a SLOW QRSS/DFCW window where DFCW-600 or
>> DFCW-6000 can be
displayed. Here, it makes no sense to monitor the ALPHAs
>> and
8,97 kHz in e.g. 4 Hz FFT bandwith, what we need is 4 mHz! So,
that
one
>> DFCW element takes 10 minutes. Another important
step is to have a STABLE
>> soundcard sample rate. This is well
performed in the latest SpecLab
>> version. Alternatively a GPS
synchronisation or so is necessray!
> [..]
>> What do
the canadians or US stns think about that? Any REAL
interest?
>
> I have the necessary frequency stability/accuracy
either already in place
or
> easily arranged and I'm certainly
interested, but unfortunately I live
inland
> about 1000 miles from
the East coast of Canada (the best Rx location would
be
> somewhere
around St. Johns Newfoundland). Nevertheless, I'll see if I
can
> receive the Alpha signals for a start. I've been
monitoring your
experiments
> and you guys have me all excited
about this VLF stuff!
>
> 73,
> Bill
VE2IQ
>
>
>
