[600MRG] EIRP

[Edward R Cole]

My NDB came with built-in RF ammeter - no problem here!
73, Ed - KL7UW

At 12:27 PM 1/27/2015, Jim Miller wrote:
>I wonder how this will all sort out? How many hams will buy or build an RF
>ammeter and go through all the calculations to stay within legal limits?
>
>73
>
>Jim ab3cv
>
>
>
>On Tue, Jan 27, 2015 at 1:55 PM, Eric NO3M <no3m at no3m.net> wrote:
>
> > An additional reference from FCC: https://apps.fcc.gov/eas/
> > comments/GetPublishedDocument.html?id=204&tn=255011
> >
> > WRC-2012 and most countries are defining 630M power limits in terms of
> > EIRP, and most likely, also the FCC when they get around to it. However,
> > many experimenters in the US refer to their power in terms of ERP.
> > Therefore, what is claimed as 5W ERP is 8.2W EIRP.
> >
> > ERP = EIRP / 1.64
> > EIRP = ERP * 1.64
> >
> > (per definition, ideal dipole [free-space?] has 2.15 dBi gain over
> > isotropic radiator, or 1.64 numerical gain).
> >
> > So, if you are running 5W ERP, cut it back to 3W ERP to get 5W EIRP.
> >
> > This all begs the question..... does anyone really know what power they're
> > running other than what's coming out of the final amplifier stage?!?  I'm
> > sure most of pretty darn close though.
> >
> > 73 Eric NO3M / WG2XJM
> >
> >
> > On 01/27/2015 01:24 PM, Rudy Severns wrote:
> >
> >> Ed raised a question on my calculation of EIRP to Pr, radiated power.
> >> According to Fritz's note on the standard definitions ERP is defined with
> >> a
> >> different reference from EIRP!  ERP is referenced to a "dipole" in free
> >> space while EIRP is referenced to an "isotropic" radiator.  I find that
> >> distinction bizarre but from Fritz's note that appears to be what the FCC
> >> has done.  Neil's (XSV) posting last week on this subject has not only the
> >> calculations but Fritz's original note.  If you think Fritz's
> >> interpretation
> >> is wrong now would be great time to sort it out.  A couple of weeks ago I
> >> misinterpreted it, using an elaborate explanation, and bought us an extra
> >> 3
> >> dB.  It was very disappointing to lose that.
> >>
> >>
> >> 73, Rudy
> >>
> >>
> >>
> >
> > _______________________________________________
> > 600MRG mailing list
> > 600MRG at w7ekb.com
> > http://w7ekb.com/mailman/listinfo/600mrg_w7ekb.com
> >
>_______________________________________________
>600MRG mailing list
>600MRG at w7ekb.com
>http://w7ekb.com/mailman/listinfo/600mrg_w7ekb.com

73, Ed - KL7UW
http://www.kl7uw.com
     "Kits made by KL7UW"
Dubus Mag business:
     dubususa at gmail.com