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Graham, Uwe
The RX PC was runing only OPERA last night,
unfortunately no decode here...
After that cycle dat was decoded this morning at 08h57
by DJ8WX I did add some mike gain.
I have to do something :-)
That PC that did crash yesterday is now transmitting
localy on a wire to check if it works localy.
But I did that already in the past with
positive -44dB decodes if I remember wel...
I'll stay tuned !
Peter PA1SDB
----- Original Message -----
Sent: Monday, December 30, 2013 6:02
PM
Subject: Re: Re: VLF: Uwe Opera-4H
Pete
Yes the more applications running , then there
can be a problem with decode ,or decode
at very low levels ,
There is something wrong with the TX sequence ,
as fade pattern shows the signal stopping before
the end of the time line
which will reduce the % chance of decode at low level
....... for your test using the Opera
system , Uwe could simply use the audio
drive from the software , if the SL code is
truncated ?
GL- !
G,
Sent: Monday, December 30, 2013 5:50 PM
Subject: Re: Re: VLF: Uwe Opera-4H
Somehow I did not got your mail Uwe,
Now I read this via Graham...
A Local test (2 PC's few meter appart) with OPERA 8
KHz did fail.
No decode's.
I think that VLF PC was to busy with 4 SL's running on
that PC to.
Just few minutes ago (17h45) I did configure
a OPERA only PC at 8 KHz.
Lets try to make that first DL - PA on 8KHz
:-)
73's Peter - PA1SDB
----- Original Message -----
Sent: Monday, December 30, 2013 3:01
PM
Subject: Re: Re: VLF: Uwe
Opera-4H
Uwe
Well that's the first past the
garden gate ! unless the drive is
3Kmt long hihi
Fade shows 32 % ? that's
only 2/3 of the tx time line
, was the Tx stopped ?
still at -2 dB s/n thats still ~ +48 dB
qro !
73-G,
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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