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In article <RrmNh.17364$Jl.16487@newsread3.news.pas.earthlink.net>,
cavelamb himself <cavelamb@earthlink.net> wrote:
> RST Engineering wrote:
> > Assuming a 1 microvolt (pretty numb these days) receiver at the other end
> > and quarter wave vertical whips at both ends, a 5 watt transmitter has a
> > THEORETICAL range of about 3000 miles. Doubling the power increases the
> > range by (sqrt(2)) or a THEORETICAL range of about 4300 miles for the 10
> > watter.
> >
> > Now since most of us will operate somewhere below the oxygen limited 12000
> > MSL altitude, and presuming you are over the ocean, your range will be
> > horizon ("line of sight") limited by the old familiar equation that horizon
> > (in miles) is equal to 1.4 times (sqrt (altitude in feet)) or something on
> > the order of 150 miles. You may get a BIT of refraction, but not enough to
> > make a difference in the basic equation.
> >
> > The real answer is that 5 or 10 watts really doesn't make a difference in
> > quiet spectrum range. It only helps "punch through" when there is a lot of
> > interfering garbage on the frequency.
> >
> > Jim
> >
>
> 1.4 Jim??
>
> Thought it was 1.17.
Square root of 2 = 1.414
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Re: theoretical radio range....
