|
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
|
