Re: [IRCA] Part 15: an explanation (and loopholes?)

["Paul B. Walker, Jr." <walkerbroadcasting@xxxxxxxxx>]

On AM, with Part 15 it is 100MW Transmitter output that counts, not being
measured 30 meters from the antenna, there would be absolutely no signal 30
meters from the antenna.

Now, for Part 15 FM.. it is measured by field strength.

AM=Limited by power output
FM=Limited by field strength 250mv/m




On 7/19/07, Joe Miller, AB8YP <ab8yp@xxxxxxxxx> wrote:
>
> Mr. Taylor,
>
> I agree with you. It's my understanding though that
> the 100 mw is measured at a distance of 30 meters from
> the antenna. Depending on the loss of signal strength,
> output power at the antenna can be compensated.
>
> On a side note, I know of a ham operator within
> 200-400 miles of me who took an old CB radio,
> converted it to transmit on ten meters, and uses it
> for a CW beacon with one watt of power. How far does
> the signal go? I heard it from my home....
>
> 73 de Joe (AB8YP)
>
>
> --- Charles A Taylor <MWDXer@xxxxxxx> wrote:
>
> > At 03:18 AM 7/19/2007 -0400, you wrote:
> > >If it's Part 15, it's limited to 100MW ERP from
> > each transmitter into a 3
> > >meter antenna.. otherwise it isn't legal.
> >
> >
> > Paul,
> >
> > What Part 15 says is that the D-C input into the
> > final shall not exceed
> > 100 mW*, not 100 mW ERP. Also, the total length of
> > the antenna, feedline
> > and ground connection shall not exceed 3 meters.
> >
> > * You mean mW=milliwatts. MW=megawatts!
> >
> > Effectively, that means the final is going to be
> > VERY close to the
> > antenna. Reading the "letter of the law," I see no
> > averse language
> > that prohibits a complete radial system. THAT would
> > make a BIG
> > difference in a 100 mW's reach/coverage.
> >
> > Also, since the D-C input is fixed at 100 mW, I see
> > no averse
> > language that limits the R-F input to the final to
> > any level.
> > That means, for example, if one uses a grounded-grid
> > or grounded-base
> > final, if driver feeds 50 mW into the final it will
> > also appear in the
> > output for a total of 150 mW!
> >
> > It looks legal to me.
> >
> > Our barn has a galvanized roof and years ago I took
> > the time and trouble
> > to bond the sheets together.I also put up a 10-foot
> > mast atop the center
> > of the roof.
> > But I never carried through and put a 100-mW
> > transmitter up there. I
> > may go berzerk and put the mast back up and try a
> > small BC station or
> > beacon.
> >
> >
> > >Meaning, they can synch more then one transmitter
> > together as long as none
> > >of the individual transmitters exceed 100MW ERP
> > with a 3 meter antenna
> >
> > Got that right!
> >
> > Charles
> >
> >    Charles A Taylor, WD4INP
> >
> >   Greenville, North Carolina
> >
> >
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> >
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> >
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> >
> >
>
>
>
>
>
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-- 
Sincerely,
Paul B. Walker, Jr.
www.walkerbroadcasting.com
www.myspace.com/walkerbroadcasting
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