Hi Brian, hi group,
it looks like I've had a 1-way contact to your SpecLab recorder last night
:-). I had transmitted my callsign twice on 135922.2 using 30s dots between
21:50 and 23:43 UT. Lucky enough, the opening of our path occured in that
period. My signal can first be detected in your TA-plot during a noise dip
around 22:05, and rising up to some 8dB SNR around 22:27. Now I understand
what the funny specialties Wolf implemented in SpecLab are good for...
Besides functioning as a "parrot" for testing our TXs, these spectrograms
contain a wealth of information. For example, the 350mW IMP visible at 135.36
originates only 160 km northwest of me, but fades in more than half an hour
later. And who or what are the carriers on 136.50 (fading) and
135.75(constant)? The strange noise bands above 137.1 seem to be a local
problem, as the noise between 20:15 and 05:05 (street lights?). The long dash
before 02:00 on 137.84 is something I have regularly seen here, its a
DBF39-Luxembourg-IMP with some AM-broadcast audio-tone.
Sometime early in the last century, amateurs invented an ingeneous
realtime-propagation-check method (called a QSO). Brian, I'm looking forward
to do just that...
73 de Markus, DF6NM
Dear All,
Following the launch of two very powerful facilities in SpecLab namely:
scheduled waterfall capture and scheduled export of Xcel compatible text
files
it is possible to automate a PC data logger to look at the band and to plot
the peak amplitude of various signals in various bandwidths, the frequency
of each of those peak amplitudes and the noise floor. I have implemented
such a trial scheme to look at DCF39, CFH, 136KHz, the TA slot and SXV.
The intention is that my web pages should be updated around 0700utc
each morning. There is also a bonus, since Laurie G3AQC puts a very good
signal into this location there is a slot at 135915 to 135927Hz which is
automatically plotted, so if you want to try out your transmitter feel
free,
the period between points plotted is 90s so any transmission must exceed
this several times to be useful.
The URL for SpecLab is:http://www.qsl.net/dl4yhf/spectra1.html
My sincere thanks to Wolf DL4YHF for all his help and patience.
73, Brian
73 Brian CT1DRP IN51QD 41 09 58N 08 39 11W
http://homepage.esoterica.pt/~brian
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