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From: "mal hamilton" <g3kevmal@talktalk.net>
To: <rsgb_lf_group@blacksheep.org>
References: <AANLkTilkWqKd70tp2flQkplDJp6URK9OWP_NNeUh3dz6@mail.gmail.com>
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Subject: LF: Re: 137.500 kHz ROS beacon
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Gary
If that was you last nite on  137.5 kcs you were strong enough for cw=
 or qrs3 no need to struggle with decodes from elswhere.
also I had a qso with G3XIZ this morning on 137.0 kcs and got 599, he=
 was 569.
Not sure what antenna u were using but it was putting out a fair signa=
l to this qth. Your radiators are probably acting as an antenna above=
 earth.

de mal/g3kev

  ----- Original Message -----=20
  From: Gary - G4WGT=20
  To: LF Group (RSGB)=20
  Sent: Sunday, June 20, 2010 12:07 PM
  Subject: LF: 137.500 kHz ROS beacon


    Hi LF,
  Having successfully bench & on-air tested a x2 harmonic amplifier me=
thod of driving my G0MRF Class D LF transmitter, I ran a beacon last=
 night (Saturday 19th) on 137.500 kHz.


  An extract from my previous e-mail description is shown at the end.


  Using the equipment & method described below, the ERP from my 12 met=
re vertical antenna was around 150mW. The mode was ROS MF-1, 100 Hz ba=
ndwidth.


  I received the following report from Michel, F5WK in JN18HP, a dista=
nce of 410 miles (661 kilometres) in daylight.


  >> Not even a faint trace on a QRSS3 spectrum but:

  >> RX1: 19:23 @ 5.9 Hz: 9 <STOP> -37 dB
  >> RX1: 19:28 @ 5.4 Hz: O4WGT <STOP> -34 dB
  >> RX1: 19:33 @ 5.4 Hz: G4WGT <STOP> -31 dB


  The x2 harmonic low level amplifier is a simple way of driving a Cla=
ss D type of transmitter which employs a divide by 2 drive chain. My=
 limitation with multi tone drive is that my DDS VFO will only produce=
 2 frequencies ie. the main frequency & a CW/Rx offset which has previ=
ously limited me to 2 tones as with RTTY & DFCW modes.


  Please bear in mind that it will not be suitable for modes like PSK=
 were tones are transmitted simultaneously.


  At the moment the 2 small PCB's are precariously lying on the desk,=
 when I have cased them I will publish the circuit & pictures.


  73


  Gary - G4WGT.
    ***********************************************
    After a few days experimenting & bench testing a method of driving=
 my
    G0MRF Class D Tx on the 137.000 kHz band from my linear transverte=
r I finally
    constructed a harmonic amplifier producing a 274.000 kHz signal fr=
om 137.000
    kHz input. An "on-air" trial was conducted resulting in a QSO with
    Graham G0NBD on 137.000 kHz using ROS data mode software.
    =20
    My thanks to Graham for his ideas & tests.
    =20
    The mode used was ROS MF-7. The equipment used for the QSO was as
    follows. Kenwood TS-440 to my LF-MF linear transverter producing=
 the
    137.000 kHz signal, followed by a tuned harmonic circuit & buffer
    amplifier whose output was 274.000 kHz therefore at x2 drive for=
 the Class
    D Tx. The x2 signal is then divided by the Tx driver chain in the
    normal way to provide 137.000 kHz to the PA.
    =20
    This method should also work well using WSPR & other similar modes=
.
    *********************************************

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3Diso-88=
59-1">
<META content=3D"MSHTML 6.00.2600.0" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Gary</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>If that was you last nite on&nbsp; 13=
7.5 kcs you=20
were strong enough for cw or qrs3&nbsp;no need to struggle with decode=
s from=20
elswhere.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>also I had a qso with G3XIZ this morn=
ing on 137.0=20
kcs and got 599, he was 569.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Not sure what antenna u were using&nb=
sp;but it was=20
putting out a fair signal to this qth. Your radiators are probably act=
ing as an=20
antenna above earth.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>de mal/g3kev</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<BLOCKQUOTE   style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-L=
EFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV     style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color:=
 black"><B>From:</B>=20
  <A title=3Dg4wgt@tiscali.co.uk href=3D"mailto:g4wgt@tiscali.co.uk">G=
ary -=20
  G4WGT</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A title=3Drsgb_lf_group@=
blacksheep.org     href=3D"mailto:rsgb_lf_group@blacksheep.org">LF Gro=
up (RSGB)</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Sunday, June 20, 2010=
 12:07=20
PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> LF: 137.500 kHz ROS=
 beacon</DIV>
  <DIV><BR></DIV><SPAN     style=3D"FONT-SIZE: 13px; FONT-FAMILY: aria=
l, sans-serif; BORDER-COLLAPSE: collapse">
  <UL>Hi LF,</UL>
  <DIV>Having successfully bench &amp; on-air tested a x2 harmonic amp=
lifier=20
  method of driving my G0MRF Class D LF transmitter, I ran a beacon la=
st night=20
  (Saturday 19th) on 137.500 kHz.</DIV>
  <DIV><BR></DIV>
  <DIV>An extract from my previous e-mail description is shown at the=
 end.</DIV>
  <DIV><BR></DIV>
  <DIV>Using the equipment &amp; method described below, the ERP from=
 my 12=20
  metre vertical antenna was around 150mW. The mode was ROS MF-1, 100=
 Hz=20
  bandwidth.</DIV>
  <DIV><BR></DIV>
  <DIV>I received the following report from Michel, F5WK in JN18HP, a=
 distance=20
  of 410 miles (661 kilometres) in daylight.</DIV>
  <DIV><BR></DIV>
  <DIV>&gt;&gt; Not even a faint trace on a QRSS3 spectrum but:<BR><BR=
>&gt;&gt;=20
  RX1: 19:23 @ 5.9 Hz: 9 &lt;STOP&gt; -37 dB<BR>&gt;&gt; RX1: 19:28 @=
 5.4 Hz:=20
  O4WGT &lt;STOP&gt; -34 dB<BR>&gt;&gt; RX1: 19:33 @ 5.4 Hz: G4WGT &lt=
;STOP&gt;=20
  -31 dB</DIV>
  <DIV><BR></DIV>
  <DIV>The x2 harmonic low level amplifier is a simple way of driving=
 a Class D=20
  type of transmitter which employs a divide by 2 drive chain. My limi=
tation=20
  with multi tone drive is that my DDS VFO will only produce 2 frequen=
cies ie.=20
  the main frequency &amp; a CW/Rx offset which has previously limited=
 me to 2=20
  tones as with RTTY &amp; DFCW modes.</DIV>
  <DIV><BR></DIV>
  <DIV>Please bear in mind that it will not be suitable for modes like=
 PSK were=20
  tones are transmitted simultaneously.</DIV>
  <DIV><BR></DIV>
  <DIV>At the moment the 2 small PCB's are precariously lying on the=
 desk, when=20
  I have cased them I will publish the circuit &amp; pictures.</DIV>
  <DIV><BR></DIV>
  <DIV>73</DIV>
  <DIV><BR></DIV>
  <DIV>Gary - G4WGT.</DIV>
  <UL>***********************************************</UL>
  <UL>After a few days experimenting &amp; bench testing a method of=
 driving=20
    my<BR>G0MRF Class D Tx on the 137.000 kHz band from my linear tran=
sverter I=20
    finally<BR>constructed a harmonic amplifier producing a 274.000 kH=
z signal=20
    from 137.000<BR>kHz input. An "on-air" trial was conducted resulti=
ng in a=20
    QSO with<BR>Graham G0NBD on 137.000 kHz using ROS data mode=20
    software.<BR>&nbsp;<BR>My thanks to Graham for his ideas &amp;=20
    tests.<BR>&nbsp;<BR>The mode used was ROS MF-7. The equipment used=
 for the=20
    QSO was as<BR>follows. Kenwood TS-440 to my LF-MF linear transvert=
er=20
    producing the<BR>137.000 kHz signal, followed by a tuned harmonic=
 circuit=20
    &amp; buffer<BR>amplifier whose output was 274.000 kHz therefore=
 at x2 drive=20
    for the Class<BR>D Tx. The x2 signal is then divided by the Tx dri=
ver chain=20
    in the<BR>normal way to provide 137.000 kHz to the PA.<BR>&nbsp;<B=
R>This=20
    method should also work well using WSPR &amp; other similar modes.=
</UL>
  <UL>*********************************************</UL></BLOCKQUOTE><=
/SPAN></BODY></HTML>

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