Message-ID: <4DC2E927.3040508@iup.uni-heidelberg.de>
Date: Thu, 05 May 2011 20:15:03 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: QRSS30 QRPp beacon approx 137.770kHz - reports appreciated
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Hello Roger,

You may put the circuit in a waterproof plastic bag and put in the the=20
center of a water filled backet. Then it is sourrounded by a high=20
thermal capacity and should drift much slower :-) Shouldn't be a problem=
=20
for a QRP device...

73, Stefan/DK7FC

Am 05.05.2011 18:21, schrieb Roger Lapthorn:
> Hi Stefan (et al)
>
> Using the readout I have (nearest 10Hz on my FT817 and IC703) it is=20
> very close to 137.770kHz by zero beating the signal. It would be=20
> helpful to get a semi-local with accurate frequency calibration to=20
> confirm the exact frequency. I may try measuring the offset from one=20
> of the strong commercial signals and see if I can get a closer figure=20
> although I am going away for a week so this will have to wait until I=20
> get back.
>
> QRSS60 would be too wobbly with the crystal/divider arrangement I=20
> currently have. Even QRSS30 was marginal (wobbly) with G3WCB and=20
> PA3CPM. At the moment the beacon board is just sitting on the desk in=20
> the open air and I suspect the crystal frequency moves a few Hz=20
> (before division) as I wave my arms typing this. There is also=20
> temperature drift as the PA keys on. All can be much improved.
>
> F1AFJ is not in the best direction for the loop antenna, but I am an=20
> optimist.
>
> 73s
> Roger G3XBM
>
>
> 2011/5/5 Stefan Sch=E4fer <Stefan.Schaefer@iup.uni-heidelberg.de=20
> <mailto:Stefan.Schaefer@iup.uni-heidelberg.de>>
>
>     Hello Roger,
>
>     What means close? Is it above 770 so i am looking for you :-)
>     Maybe the first RX stations can confirm the actual frequency, if
>     unknown so far.
>
>     73, GL, Stefan
>
>     PS: QRSS60 would be more useful for all the grabbers. I see a goog
>     chance that you can appear at F1AFJ!
>
>
>     Am 05.05.2011 15:27, schrieb Roger Lapthorn:
>>     My QRSS30 50uW beacon *XBM* (space then G3XBM at 10wpm) is now
>>     active on its new frequency close to 137.770kHz until 2300z this
>>     evening. As always, reports and screen shots would be very much
>>     appreciated.
>>
>>     If trying to copy it, very best of luck.
>>
>>     73s
>>     Roger G3XBM
>>
>>     --=20
>>     http://g3xbm-qrp.blogspot.com/
>>     http://www.g3xbm.co.uk
>>     http://www.youtube.com/user/g3xbm
>>     https://sites.google.com/site/sub9khz/
>>
>
>
>
> --=20
> http://g3xbm-qrp.blogspot.com/
> http://www.g3xbm.co.uk
> http://www.youtube.com/user/g3xbm
> https://sites.google.com/site/sub9khz/
>

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Hello Roger,<br>
<br>
You may put the circuit in a waterproof plastic bag and put in the the
center of a water filled backet. Then it is sourrounded by a high
thermal capacity and should drift much slower :-) Shouldn't be a
problem for a QRP device...<br>
<br>
73, Stefan/DK7FC<br>
<br>
Am 05.05.2011 18:21, schrieb Roger Lapthorn:
<blockquote   cite="mid:BANLkTi=0_XUGtp-RG5ZNA6aBh7Hr4NW4zw@mail.gmail.com"   type="cite">Hi Stefan (et al)<br>
  <br>
Using the readout I have (nearest 10Hz on my FT817 and IC703) it is
very close to 137.770kHz by zero beating the signal. It would be
helpful to get a semi-local with accurate frequency calibration to
confirm the exact frequency. I may try measuring the offset from one of
the strong commercial signals and see if I can get a closer figure
although I am going away for a week so this will have to wait until I
get back.<br>
  <br>
QRSS60 would be too wobbly with the crystal/divider arrangement I
currently have. Even QRSS30 was marginal (wobbly) with G3WCB and
PA3CPM. At the moment the beacon board is just sitting on the desk in
the open air and I suspect the crystal frequency moves a few Hz (before
division) as I wave my arms typing this. There is also temperature
drift as the PA keys on. All can be much improved.<br>
  <br>
F1AFJ is not in the best direction for the loop antenna, but I am an
optimist.<br>
  <br>
73s<br>
Roger G3XBM<br>
  <br>
  <br>
  <div class="gmail_quote">2011/5/5 Stefan Sch&auml;fer <span dir="ltr">&lt;<a   moz-do-not-send="true"   href="mailto:Stefan.Schaefer@iup.uni-heidelberg.de" target="_blank">Stefan.Schaefer@iup.uni-heidelberg.de</a>&gt;</span><br>
  <blockquote class="gmail_quote"   style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
    <div bgcolor="#ffffff" text="#000000">
Hello Roger,<br>
    <br>
What means close? Is it above 770 so i am looking for you :-) Maybe the
first RX stations can confirm the actual frequency, if unknown so far.<br>
    <br>
73, GL, Stefan<br>
    <br>
PS: QRSS60 would be more useful for all the grabbers. I see a goog
chance that you can appear at F1AFJ!<br>
    <br>
    <br>
Am 05.05.2011 15:27, schrieb Roger Lapthorn:
    <div>
    <div>
    <blockquote type="cite">My QRSS30 50uW beacon <b>XBM</b> (space
then G3XBM at
10wpm) is now active on its new frequency close to 137.770kHz until
2300z this evening. As always, reports and screen shots would be very
much appreciated. <br>
      <br>
If trying to copy it, very best of luck.<br>
      <br>
73s<br>
Roger G3XBM<br>
      <br>
-- <br>
      <a moz-do-not-send="true" href="http://g3xbm-qrp.blogspot.com/"   target="_blank">http://g3xbm-qrp.blogspot.com/</a><br>
      <a moz-do-not-send="true" href="http://www.g3xbm.co.uk"   target="_blank">http://www.g3xbm.co.uk</a><br>
      <a moz-do-not-send="true" href="http://www.youtube.com/user/g3xbm"   target="_blank">http://www.youtube.com/user/g3xbm</a><br>
      <a moz-do-not-send="true"   href="https://sites.google.com/site/sub9khz/" target="_blank">https://sites.google.com/site/sub9khz/</a><br>
      <br>
    </blockquote>
    </div>
    </div>
    </div>
  </blockquote>
  </div>
  <br>
  <br clear="all">
  <br>
-- <br>
  <a moz-do-not-send="true" href="http://g3xbm-qrp.blogspot.com/"   target="_blank">http://g3xbm-qrp.blogspot.com/</a><br>
  <a moz-do-not-send="true" href="http://www.g3xbm.co.uk"   target="_blank">http://www.g3xbm.co.uk</a><br>
  <a moz-do-not-send="true" href="http://www.youtube.com/user/g3xbm"   target="_blank">http://www.youtube.com/user/g3xbm</a><br>
  <a moz-do-not-send="true"   href="https://sites.google.com/site/sub9khz/" target="_blank">https://sites.google.com/site/sub9khz/</a><br>
  <br>
</blockquote>
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