Hi Peter, Graham and Markus,
when Im really dreaming the Fade becomes zero. Pse see:
http://dj8wx-dl.de/opera5.jpg
the TX is still on the air. Pse try your best,
GL and hny
Uwe/dj8wx
Von: [email protected]
Gesendet: 31.12.2013 11:43
An: [email protected]
Betreff: Re: VLF: Uwe Opera-4H
Unfortunately no copy from Uwe, here in
JO42FD using the broadband VLF E-field receiver at DF0WD and 0.5
mHz FFT bin width..
Hny and cul,
Wolf.
Am 31.12.2013 10:18, schrieb PA1SDB, Peter:
Uwe,
This message (below) came in my mail
box at 08:42 UTC today (31-Dec-13)
73's Peter..
----- Original Message -----
Sent: Monday, December 30,
2013 2:46 PM
Subject: Re: Re: VLF: Uwe
Opera-4H
HI Peter,
I changed the TX QRG to 8912.5Hz
running SpecLab in Op-4H (ASK0) mode and made a first test
with positive result.
the RX was located in 3km distance - Opera v.1.5.0 ,
RX aerial a 10m wire connected to the soundcard.
TX output pwr about 1W. pse see:
http://dj8wx-dl.de/opera3.jpg
I think we should have a try as you are
my nearest station rxing VLF.
Now Im increasing the PA output pwr to
500Wrms.
GL
Uwe/dj8wx
Von: [email protected]
Gesendet: 29.12.2013 09:45
An: [email protected]
Betreff: Re: VLF: Uwe Opera-4H
Hello Uwe, Markus, VLF
Nothing was seen or
detected here from your transmission in OPERA mode either..
No recognizable trace
at all.
While
you're continuous unmodulated signal almost overloads my
soundcard input.
73's Peter - PA1SDB
----- Original Message -----
Sent:
Saturday, December 28, 2013 9:08 PM
Subject: Re:
VLF: Uwe Opera-4H
yes Markus, I have had the screen showing the SecLab
components in my focus whilst doing other jobs - for
hours.
Now the carrier only mode is on the
air.
Until next test
GL
Uwe/dj8wx
Von: [email protected]
Gesendet: 28.12.2013 19:07
An: [email protected]
Betreff: VLF: Uwe Opera-4H
Uwe,
sorry,
nothing was seen or detected here from your
transmission today. Not a trace. Der
erste Versuch ist meist nicht genuch (Didi
Drahtlos).
Yes
I noticed the good trace on Paul Nicholson's
spectrogram http://abelian.org/vlf/fbins.shtml#p=1388246400&b=080&s=sp.
Just
look at it the other way round: You did send a long
carrier, only with some short interruptions. But the
gaps were so short that the spectrum didn't notice
them ;-)
More
seriously: Compared to a continuous carrier, with 50%
duty cycle the carrier component is still there but 6
db down (half average voltage). In terms of power, on
average you are spending 50% of the power. 25% (-6 dB)
goes to the central carrier, and the other 25% into
the AM sidebands carrying the message.
What
I find strange is that the spectrogram trace seems to
have jumped 28 mHz low, once near the beginning and
again for an hour around 14:30. Are you sure that your
samplerate correction had been engaged without
interruption?
Best
73,
Markus
(DF6NM)
Sent: Saturday, December 28,
2013 3:05 PM
Subject: Re: Re: LF: Sending
Opera with SpecLab
OK., Markus,
but the Todmorden grabber shows the signs.its a surprise
for me. I didnt expect it samples such relative short
signs.
GL
Uwe/dj8wx
tks for the correction.
Von: [email protected]
Gesendet: 28.12.2013 12:47
An: [email protected]
Betreff: Re: LF: Sending Opera with SpecLab
Uwe,
good news!
I'm watching and searching ;-)
Background
noise seems to be a few dB higher than the last
couple of days, but we'll see what's possible
anyway. Unfortunately the OK2BVG grabber
website appears to be down at the moment.
Good
luck!
73,
Markus (DF6NM)
PS:
In my original mail, the Op-8 line in the speed
table erroneously contained an entry for Op-4.
This has been corrected beneath.
Sent: Saturday, December 28,
2013 12:14 PM
Subject: LF: Sending Opera
with SpecLab
Hi all,
the PA has been switched on. the next txt block will
start now.
GL
Uwe/dj8wx
Von: [email protected]
Gesendet: 27.12.2013 15:47
An: [email protected]
Betreff: Re: Re: LF: Sending Opera with SpecLab
Hi Markus, Wolf, Stefan, Peter es all,
tks for the advice, Markus
now SpecLab is beaconing in mode Op-4H on
8969.99Hz
the PA is off until it is dry outside.
I keep your proposal txing btwn 0700 and
1400MEZ in mind, Markus.
GL
Uwe/dj8wx/dj8CAT
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