Hello Bryan,
ERP, EIRP, EMRP ... It's just a matter of what reference antenna you take
ERP is the power which would be required to be fed to an 1/2 WAVE
DIPOLE antenna
to achieve the same field strength at the same distance as is generated by
the antenna under discussion in the centre of its main lobe FEEDING 1
WATT INTO THE ANTENNA.
EIRP: as above but replace 1/2 WAVE DIPOLE by ISOTROPIC
EMRP: as above but replace 1/2 WAVE DIPOLE by VERTICAL MONOPOLE
73, Rik ON7YD
Quoting captbrian <[email protected]>:
Gentlemen,
I have long been fully familiar with 'isotropic antenna ' and 'Effective
Radiated Power.' ......indeed I hope no-one can get a transmitting licence
without such knowledge but.........
ERP is the power which would be required to be fed to an isotropic antenna
to achieve the same field strength at the same distance as is generated by
the antenna under discussion in the centre of its main lobe.
for example: an antenna with a gain of 10db fed with one watt of power has
an ERP of 10 watts.
However "Effective_ Isotropic_ Radiated Power" is ..........what ?
Bryan
----- Original Message -----
From: "John Andrews" <[email protected]>
To: <[email protected]>
Sent: 06 October 2006 11:33
Subject: Re: LF: Re: erp ierp VY1JA
Bryan,
As others have pointed out, the "I" is for isotropic, a theoretical
radiator that sends the same signal in all directions. A 3-D model of
the radiation pattern would be a sphere. The far field of a dipole has
no signal off the ends, and hence has gain in the favoured direction (at
right angles to the dipole). The 3-D model would be a donut (without
chocolate frosting).
John A.
captbrian wrote:
> What is I in IERP ?
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