On 16/03/2011 05:27, Gerhard Hickl wrote:
Eddie: My grabber is locked to GQD and should display the QRG very
accurately! So what you see is what you get!
Thanks Gerhard my reference is also using GQD. From your Grabber I am
unable to establish the Dash frequency of Lubo's transmission to the mHz
level. My line measured here was 8970.039Hz what do you measure his Dash
frequency as please.
It would be nice to sweep this one under the carpet, originally I was
not going to mention it.:-)
73 Eddie G3ZJO
Am Mittwoch, den 16.03.2011, 00:46 +0100 schrieb Markus Vester:
The OE3GHB grabber shows a long bright line on 8969.98 from 16:00 to
4:30. The sensitivity was not degraded, so perhaps only a local
oscillator test.
Or a nighttime carrier from OK2BVG? But it looks stronger than the
subsequent "KKK" which Lubos sent on 8970.02 / .04 from 6:00 to 15:45.
OE5ODL then shows a very bright "riser" from 6:15 to 14:15. This was
his own transmission, also visible at DK7FC.
So probably two different signals, both on 8969.98. Could it be that
Roger's screenshot has hints of both?
Best 73,
Markus (DF6NM)
From: Roger Lapthorn
Sent: Tuesday, March 15, 2011 11:13 PM
To: [email protected] ; Eddie ; [email protected]
Subject: LF: VLF reception - easily mistaken!
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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www.g3xbm.co.uk
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G3XBM GQRP 1678 ISWL G11088
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