Roger
Very true, I thought you were going to outline what I saw between
aprox. 14.30 and 15.30 UTC on 8.970039kHz today, a short line which
caused me to check announced frequencies of operation at that time
and frequency.
Unannounced as far as I can see we have OK2BVG repeating his K in
DFCW at this time, clearly visible on the OE3GHB Grabber. The period
time for one element of his K is just short of one hour the period
of my observation. One problem if OE3GHB timing is right Lubos was
sending a dit at that time I am seeing the dah frequency and there
is a 30 min time shift too. I therefore disregarded it.
Gerhard, it would be interesting to know the exact frequency you
received Lubos dashes on, I suppose my line could be part signal
part noise, this is the only place on the whole screen, apart from
Uwes signal, where pixels conspire to produce a visible straight
line 4 to 5 dB above the noise.
73 Eddie G3ZJO
On 15/03/2011 22:13, Roger Lapthorn wrote:
A word of caution to those of us looking for very
weak signals around 8-9kHz.....
DJ8WX was copied here overnight without any doubt and my grabber
was clearly able to see his close-down around 0700 today. The
frequency and the trace timing corresponded perfectly. Likewise
with G3XIZ and DK7FC/P some weeks ago.
This evening I was looking very carefully again at the Spectrum
Lab screen from the last 24 hours in 424uHz BW and readjusting
audio gain ranges, screen colour saturation and contrast. Out of
the noise appeared another very very faint line, not at 8.970022
but at 8.96998kHz. I've attached the screen shot here (I have
overlaid it with the time for clarity).
My immediate reaction was this must be Ossi OE5ODL. Then I checked
his grabber and saw he was not operational overnight last night!
So, what looked like a trace on his frequency cannot be
him. It must instead be some artefact of SL or something else.
So, Mal is right (did I just say that? :-) ) that we have
to be very careful when seeing traces at specific
frequencies: it may be an indication of a given station, but
without some modulation or turning on/off of the carrier a doubt
remains.
Sadly I don't think I did see Ossi today after all, but I shall
keep looking.
73s
Roger G3XBM
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G3XBM GQRP 1678 ISWL G11088
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