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Date: Tue, 15 Mar 2011 23:09:59 +0000
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Subject: Re: LF: VLF reception - easily mistaken!
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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
> -- 
> g3xbm-qrp.blogspot.com/ <http://g3xbm-qrp.blogspot.com/>
> www.g3xbm.co.uk <http://www.g3xbm.co.uk>
> www.youtube.com/user/g3xbm <http://www.youtube.com/user/g3xbm>
> G3XBM   GQRP 1678    ISWL G11088


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    Roger<br>
    <br>
    Very true, I thought you were going to outline what I saw between
    aprox. 14.30 and 15.30&nbsp; UTC on 8.970039kHz today, a short line which
    caused me to check announced frequencies of operation at that time
    and frequency.<br>
    <br>
    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&nbsp; 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.<br>
    <br>
    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.<br>
    <br>
    73 Eddie G3ZJO<br>
    <br>
    On 15/03/2011 22:13, Roger Lapthorn wrote:
    <blockquote        cite="mid:AANLkTin_33F-mJQyrhbBqdSyY0HNFEizst=3iSWywUM_@mail.gmail.com"        type="cite">A word of caution to those of us looking for <i>very</i>
      weak signals around 8-9kHz.....<br>
      <br>
      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.<br>
      <br>
      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). <br>
      <br>
      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 <i>cannot</i> be
      him. It must instead be some artefact of SL or something else.<br>
      <br>
      So, <b>Mal is right</b> (did I just say that? :-) ) that we have
      to be <i>very </i>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.<br>
      <br>
      Sadly I don't think I did see Ossi today after all, but I shall
      keep looking.<br clear="all">
      <br>
      73s<br>
      Roger G3XBM<br>
      -- <br>
      <a moz-do-not-send="true" href="http://g3xbm-qrp.blogspot.com/"          target="_blank">g3xbm-qrp.blogspot.com/</a><br>
      <a moz-do-not-send="true" href="http://www.g3xbm.co.uk"          target="_blank">www.g3xbm.co.uk</a><br>
      <a moz-do-not-send="true" href="http://www.youtube.com/user/g3xbm"          target="_blank">www.youtube.com/user/g3xbm</a><br>
      G3XBM&nbsp;&nbsp; GQRP 1678&nbsp;&nbsp;&nbsp; ISWL G11088<br>
    </blockquote>
    <br>
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