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Message-ID: <57D31B165A1B4B97B69CC60A4D47DB55@gnat>
From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <522FF986.5010103@virginbroadband.com.au> <1378890643.59333.YahooMailNeo@web133205.mail.ir2.yahoo.com>
Date: Wed, 11 Sep 2013 10:55:14 +0100
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Subject: Re: LF: Radio signals
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Hi Edgar.......Or if the receiver is operating in a linear mode.....then =
straight addition, but probably only with SSB detection, an AM =
demodulater diode is non-linear :-))
If you add the signals coming from the same transmitter but over =
slightly different paths which alters the phase at the receiver, you get =
fading but this is only obvious is one or both path lengths changes.=20

Alan
G3NYK
  ----- Original Message -----=20
  From: M0FMT=20
  To: rsgb_lf_group@blacksheep.org=20
  Sent: Wednesday, September 11, 2013 10:10 AM
  Subject: Re: LF: Radio signals


  Hi=20

  Non linearity in the first RX stage? Caused by a fault in the stage or =
over driving of the stage.Or some very bad corrosion in the joints of =
the antenna leads. etc etc. Check your RX,  try fitting an attenuator in =
the antenna lead or shorten your antenna.

  Or for a more esoteric explanation =
http://en.wikipedia.org/wiki/Luxemburg%E2%80%93Gorky_effect

  73 es GL Pete M0FMT IO91UX


  From: edgar <edgarjtwining@virginbroadband.com.au>
  To: "600m@yahoogroups.com" <600m@yahoogroups.com>; =
"rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>=20
  Sent: Wednesday, 11 September 2013, 6:03
  Subject: LF: Radio signals


  Hi Group,

  What is the mechanism for the way radio signals combine in the air?

  For example

  1.There are two transmitters each sending out the same fixed frequency =

  sine wave signal.

  2. There are no other signals in space, and no background noise.

  3. There are no propagation factors modifying the signals.

  e.g. buildings, ionosphere layers.

  4. Both transmitters are the same distance from the receiver.

  5. Both signals have the same polarisation.

  How have the signals combined when they reach a receiving antenna at a =

  reasonable distance from both transmitters?

  It the process addition, multiplication or some other process?

  Regards, Edgar
  Moonah, Tasmania.


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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.23501">
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2 face=3DArial>Hi Edgar.......Or if the receiver is =
operating in a=20
linear mode.....then straight addition, but probably only with SSB =
detection, an=20
AM demodulater diode is non-linear :-))</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>If you add the signals coming from the =
same=20
transmitter but over slightly different paths which alters the phase at =
the=20
receiver, you get fading but this is only obvious is one or both path =
lengths=20
changes. </FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>Alan</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>G3NYK</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"=20
dir=3Dltr>
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black"><B>From:</B>=20
  <A title=3Dm0fmt@yahoo.co.uk =
href=3D"mailto:m0fmt@yahoo.co.uk">M0FMT</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Drsgb_lf_group@blacksheep.org=20
  =
href=3D"mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org=
</A>=20
  </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, September 11, =
2013 10:10=20
  AM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: LF: Radio =
signals</DIV>
  <DIV><FONT size=3D2 face=3DArial></FONT><BR></DIV>
  <DIV=20
  style=3D"BACKGROUND-COLOR: #fff; FONT-FAMILY: arial, helvetica, =
sans-serif; COLOR: #000; FONT-SIZE: 12pt">
  <DIV><SPAN>Hi </SPAN></DIV>
  <DIV><SPAN><FONT size=3D2></FONT></SPAN>&nbsp;</DIV>
  <DIV><SPAN>Non linearity in the first RX stage? Caused by a fault in =
the stage=20
  or over driving of the stage.Or some very bad corrosion in the joints =
of the=20
  antenna leads. etc etc. Check your RX,&nbsp; try fitting an attenuator =
in the=20
  antenna lead or shorten your antenna.</SPAN></DIV>
  <DIV><SPAN><FONT size=3D2></FONT></SPAN>&nbsp;</DIV>
  <DIV><SPAN>Or for <VAR id=3Dyui-ie-cursor></VAR>a more esoteric =
explanation <A=20
  =
href=3D"http://en.wikipedia.org/wiki/Luxemburg%E2%80%93Gorky_effect">http=
://en.wikipedia.org/wiki/Luxemburg%E2%80%93Gorky_effect</A></SPAN><BR></D=
IV>
  <DIV>73 es GL Pete M0FMT IO91UX</DIV><BR>
  <DIV style=3D"FONT-FAMILY: arial, helvetica, sans-serif; FONT-SIZE: =
12pt">
  <DIV=20
  style=3D"FONT-FAMILY: times new roman, new york, times, serif; =
FONT-SIZE: 12pt">
  <DIV dir=3Dltr>
  <DIV=20
  style=3D"BORDER-BOTTOM: rgb(204,204,204) 1px solid; BORDER-LEFT: =
rgb(204,204,204) 1px solid; PADDING-BOTTOM: 0px; LINE-HEIGHT: 0; MARGIN: =
5px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; HEIGHT: 0px; FONT-SIZE: =
0px; BORDER-TOP: rgb(204,204,204) 1px solid; BORDER-RIGHT: =
rgb(204,204,204) 1px solid; PADDING-TOP: 0px"=20
  class=3Dhr contentEditable=3Dfalse readonly=3D"true"></DIV><FONT =
size=3D2=20
  face=3DArial><B><SPAN style=3D"FONT-WEIGHT: bold">From:</SPAN></B> =
edgar=20
  &lt;edgarjtwining@virginbroadband.com.au&gt;<BR><B><SPAN=20
  style=3D"FONT-WEIGHT: bold">To:</SPAN></B> "600m@yahoogroups.com"=20
  &lt;600m@yahoogroups.com&gt;; "rsgb_lf_group@blacksheep.org"=20
  &lt;rsgb_lf_group@blacksheep.org&gt; <BR><B><SPAN=20
  style=3D"FONT-WEIGHT: bold">Sent:</SPAN></B> Wednesday, 11 September =
2013,=20
  6:03<BR><B><SPAN style=3D"FONT-WEIGHT: bold">Subject:</SPAN></B> LF: =
Radio=20
  signals<BR></FONT></DIV>
  <DIV class=3Dy_msg_container><BR>Hi Group,<BR><BR>What is the =
mechanism for the=20
  way radio signals combine in the air?<BR><BR>For =
example<BR><BR>1.There are=20
  two transmitters each sending out the same fixed frequency <BR>sine =
wave=20
  signal.<BR><BR>2. There are no other signals in space, and no =
background=20
  noise.<BR><BR>3. There are no propagation factors modifying the=20
  signals.<BR><BR>e.g. buildings, ionosphere layers.<BR><BR>4. Both =
transmitters=20
  are the same distance from the receiver.<BR><BR>5. Both signals have =
the same=20
  polarisation.<BR><BR>How have the signals combined when they reach a =
receiving=20
  antenna at a <BR>reasonable distance from both transmitters?<BR><BR>It =
the=20
  process addition, multiplication or some other =
process?<BR><BR>Regards,=20
  Edgar<BR>Moonah,=20
  =
Tasmania.<BR><BR><BR><BR><BR><BR><BR><BR><BR></DIV></DIV></DIV></DIV></BL=
OCKQUOTE></BODY></HTML>

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