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Date: Sat, 05 Jan 2013 12:23:02 +0100
From: wolf_dl4yhf <dl4yhf@freenet.de>
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Subject: Re: LF: A good night on 472
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Hello Pete,

That's interesting - I am also continuously trying to improve the RX 
situation here (and at the club station DF0WD) with different levels of 
success. Tried various miniwhips (original; with other transistors; with 
parallel resonant filters at the frontend; etc) but never got it working 
as successfully as others. At the club, the wire antenna still performs 
best (with the antenna ground disconnected from mains ground during RX).
At home, an active loop antenna, operating into a low impedance 
amplifier, works best (even much better than a tuned resonant loop) 
because it's more immune to E-field pickup.
Noise levels on a 500 kHz wide spectrum are also lower on 472 kHz than 
on 500 kHz; possibly less gadgets here (like DC/DC converters designed 
to operate on ..guess what.. 500 kHz) :

http://www.datasheetcatalog.org/datasheet/vishay/71815.pdf


73,
   Wolf .

Am 05.01.2013 11:03, schrieb M0FMT:
> Hi Wolf and Graham
> It was so nice to hear the band literally full of CW. And thanks for 
> the info Wolf publishing your working conditions is very helpful. In 
> my case I am interested in the RX side as well. I am currently using  
> on RX a 2m 7/8th whip at 50ft+- connected straight into my TS690s 
> transceiver, have 500 / 250 filters fitted. Although signals are not 
> strong they are all good copy and both sides of each qso was readable. 
> The noise level was very low. If I use an open wire ant those signals 
> I can hear are very strong but the far stations are lost in noise. So 
> the noise I am getting is from the house  (mine and next door) low 
> down. The whip seems mostly out of range of the worst noise. That may 
> be of use to you Graham. However I know you are not the only one to 
> suffer from the Xmas decorations at the moment. Also 472/9 seems a 
> quieter part of MF than 501/4. The general noise floor on the SDR is 
> lower but I don't know why.

> 73 es GL Pete M0FMT IO91UX


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    <div class="moz-cite-prefix">Hello Pete,<br>
      <br>
      That's interesting - I am also continuously trying to improve the
      RX situation here (and at the club station DF0WD) with different
      levels of success. Tried various miniwhips (original; with other
      transistors; with parallel resonant filters at the frontend; etc)
      but never got it working as successfully as others. At the club,
      the wire antenna still performs best (with the antenna ground
      disconnected from mains ground during RX).<br>
      At home, an active loop antenna, operating into a low impedance
      amplifier, works best (even much better than a tuned resonant
      loop) because it's more immune to E-field pickup. <br>
      Noise levels on a 500 kHz wide spectrum are also lower on 472 kHz
      than on 500 kHz; possibly less gadgets here (like DC/DC converters
      designed to operate on ..guess what.. 500 kHz) :<br>
      <br>
      <a class="moz-txt-link-freetext" href="http://www.datasheetcatalog.org/datasheet/vishay/71815.pdf">http://www.datasheetcatalog.org/datasheet/vishay/71815.pdf</a><br>
      <br>
      <br>
      73,<br>
      &nbsp; Wolf .<br>
      <br>
      Am 05.01.2013 11:03, schrieb M0FMT:<br>
    </div>
    <blockquote
      cite="mid:1357380239.66281.YahooMailNeo@web133206.mail.ir2.yahoo.com"
      type="cite">
      <div style="color:#000; background-color:#fff; font-family:arial,
        helvetica, sans-serif;font-size:12pt">
        <div><span>Hi Wolf and Graham</span></div>
        <div><span></span>&nbsp;</div>
        <div><span>It was so nice to hear the band literally full of CW.
            And thanks for the info Wolf publishing your working
            conditions is very helpful. In my case I am interested in
            the RX side as well. I am currently using&nbsp; on RX a 2m 7/8<span
              id="misspell-0" class="mark">th</span> whip at 50ft+-
            connected straight into my TS690s <span id="misspell-1"><span>transceiver,
                have 500 / 250 filters fitted</span></span>. Although
            signals are not strong they are all good copy and both sides
            of each <span id="misspell-1" class="mark">qso</span> was
            readable. The noise level was very low. If I use an open
            wire ant those signals I can hear are very strong but the
            far stations are lost in noise. So the noise I am getting is
            from the house&nbsp; (mine and next door) low down. The whip
            seems mostly out of range of the worst noise. That may be of
            use to you Graham. However I know you are not the only one
            to suffer from the Xmas decorations at the moment. <span
              id="misspell-2">Also</span> 472/9 seems a quieter part of
            <span id="misspell-3" class="mark">MF</span> than 501/4. The
            general noise floor on the <span id="misspell-4"
              class="mark">SDR</span> is lower but I don't know why.</span><br>
        </div>
      </div>
    </blockquote>
    <br>
    <blockquote
      cite="mid:1357380239.66281.YahooMailNeo@web133206.mail.ir2.yahoo.com"
      type="cite">
      <div style="color:#000; background-color:#fff; font-family:arial,
        helvetica, sans-serif;font-size:12pt">
        <div>&nbsp;</div>
        <div>73 es <span id="misspell-5" class="mark">GL</span> Pete
          M0FMT IO91<span id="misspell-7" class="mark">UX</span><br>
        </div>
      </div>
    </blockquote>
    <br>
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