Well I always thought there was a large loss depending on the extent to
which polarisation differed between emitter and recvr.?
This is from qsl.net: :-.......
Notes
Polarization Mismatch Loss (dB) = 20 * log10(cos D) Where D is the
misalignment angle between the two antennas.
Polarization Mismatch Between Two Linearly Polarized Waves as a Function of
Angular Orientation
Orientation Angle Polarization Mismatch (dB)
0.0 (aligned) 0.0
15.0 0.3
30.0 1.3
45.0 3.0
60.0 6.0
75.0 12.0
90.0 (orthogonal) infinite (real world varies 20-35 dB)
bryan
----- Original Message -----
From: "Rik Strobbe" <[email protected]>
To: <[email protected]>
Sent: 07 October 2006 16:33
Subject: Re: LF: Re: erp ierp VY1JA
> Hello Bryan,
>
> > thank you ........and is this comparison half-wave antenna vertical or
> > horizontal ? Are there limits about how far away is the 'notional
> > measuring' position .
>
> The reference antennas for ERP and EIRP are considered to be in free
> space, polarisation does not matter.
> The reference antenna for EMRP is considered to be over a perfect ground.
>
> 73, Rik
>
> >
>
>
> Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
>
>
>
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