<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.2800.1458" name=GENERATOR></HEAD>
<BODY>
<DIV><SPAN class=509112008-03112004><FONT face=Arial
size=2> </FONT>
<P><FONT face=Arial size=2>Rowan</FONT></P>
<P><FONT face=Arial size=2>Just a quick tip when you are passively repeating RF
by "bouncing" or reflecting, is that the polarisation of the wave
changes</FONT></P>
<P><FONT face=Arial size=2>Polarisation isn't talked about much in the
literature and the cross polar<SPAN class=509112008-03112004> </SPAN>loss
between say vertical and horizontal is approx. 26dB which is enough
to</FONT></P>
<P><FONT face=Arial size=2>blow away your experiment if you are not aware of it
- that's all</FONT></P>
<P><FONT face=Arial size=2>Vertcal bounced becomes Horizontal, Right Circular
becomes Left Circular etc</FONT></P>
<P><FONT face=Arial size=2>Satellite Communicators are the most aware of with
this as the source could have<SPAN class=509112008-03112004> </SPAN>any attitude
of course, and the Pro's arrays usually combine polarity switching</FONT></P>
<P><FONT face=Arial size=2>I learnt when installing GHz links, as a check to
confirm incident path when<SPAN class=509112008-03112004> </SPAN>received levels
were down from expected</FONT></P>
<P> </P>
<P><FONT face=Arial size=2>Ooops time to shut up ! - good luck with your bounce
!</FONT></P></SPAN></DIV>
<DIV> </DIV></BODY></HTML>