Message-ID: <4D066C01.6080205@freenet.de>
Date: Mon, 13 Dec 2010 19:54:57 +0100
From: wolf_dl4yhf <dl4yhf@freenet.de>
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Subject: Re: LF: G3XBM - very long carrier VLF transmission test Dec 15th
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Hello Roger,

Do you have an estimate about your transmitter's frequency stability 
(mHz per minute or similar) ?
This would help to guesstimate a half-way matched FFT bin width, or -if 
you prefer- QRSS speed index. Anyway, even for listeners/viewers in your 
neighbourhood, I'd suggest to use a setting for QRSS 120, or, if 
soft/hardware permits, even slower mode to sequeeze the last fraction of 
a dB out of the equivalent receiver bandwidth.

Unfortunately no good site for RX reception here, otherwise I'd like to 
test a new GPS-stabilized receiver. Maybe in a few weeks, using a remote 
VLF site with wideband FM link.

Good luck with the test,
   73,   Wolf DL4YHF .

Am 12.12.2010 23:51, schrieb Roger Lapthorn:
> This Wednesday, Dec 15th, I will run tests on *8.7608kHz* with very 
> long continuous TX periods of _several hours_ interspersed with gaps 
> of 0.5 to 1 hour. Transmissions will start at 0900GMT and finish at 
> 2300GMT. I will reveal the TX pattern after the test so the test is 
> done "blind".
>
> I'd be most grateful if suitably equipped stations could look for any 
> possible signs of the signal, even though I shall only be using the 
> 20m spaced earth electrodes and 5W as used for my local earthmode 
> tests. Those able to screw the bandwidths right down may just be able 
> to detect something, although I think it is unlikely at any great 
> distance.
>
> *15.12.10 *
> *0900-2300z *
> *8.7608kHz *
> *Carrier "on" periods of 30mins or more*
>
> Good luck to anyone having a go.
>
> 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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    Hello Roger,<br>
    <br>
    Do you have an estimate about your transmitter's frequency stability
    (mHz per minute or similar) ?<br>
    This would help to guesstimate a half-way matched FFT bin width, or
    -if you prefer- QRSS speed index. Anyway, even for listeners/viewers
    in your neighbourhood, I'd suggest to use a setting for QRSS 120,
    or, if soft/hardware permits, even slower mode to sequeeze the last
    fraction of a dB out of the equivalent receiver bandwidth.<br>
    <br>
    Unfortunately no good site for RX reception here, otherwise I'd like
    to test a new GPS-stabilized receiver. Maybe in a few weeks, using a
    remote VLF site with wideband FM link.<br>
    <br>
    Good luck with the test,<br>
    &nbsp; 73, &nbsp; Wolf DL4YHF .<br>
    <br>
    Am 12.12.2010 23:51, schrieb Roger Lapthorn:
    <blockquote        cite="mid:AANLkTimiygEmJQ5_2-heM2mhkit_GiDp38RVNEVqCUcN@mail.gmail.com"        type="cite">This Wednesday, Dec 15th, I will run tests on <b>8.7608kHz</b>
      with very long continuous TX periods of <u>several hours</u>
      interspersed with gaps of 0.5 to 1 hour. Transmissions will start
      at 0900GMT and finish at 2300GMT. I will reveal the TX pattern
      after the test so the test is done "blind".<br>
      <br>
      I'd be most grateful if suitably equipped stations could look for
      any possible signs of the signal, even though I shall only be
      using the 20m spaced earth electrodes and 5W as used for my local
      earthmode tests. Those able to screw the bandwidths right down may
      just be able to detect something, although I think it is unlikely
      at any great distance.<br>
      <br>
      <div style="margin-left: 40px;"><b>15.12.10&nbsp;&nbsp;&nbsp;&nbsp; </b><br>
        <b>0900-2300z&nbsp; </b><br>
        <b>8.7608kHz&nbsp;&nbsp;&nbsp; </b><br>
        <b>Carrier "on" periods of 30mins or more</b><br>
      </div>
      <br>
      Good luck to anyone having a go.<br>
      <br>
      73s<br>
      Roger G3XBM<br clear="all">
      <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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