Re: GROUNDWAVE and SKYWAVE distances and DIAL position...
http://500kc.com/downloads/rn04-5.pdf
check that out. Nice chart showing ground wave propagation.
Apparently, the closer you get to the ideal frequency of 500 khz,
the better the ground wave.
article/proposal relates to a new ham band at 500khz, but lot's
of interesting & useful info..
fmnostatic
> you wrote:
>
> > Florida State University has a TIS on 530 with 10 watts
> that
> > goes out for several miles. Must be legal, as its been on
> > for over a decade..
>
> Tom responds:
>
> For that low on the dial it would go several miles.
>
> Indeed, I posted the following question on the DX board with
> no response. I would appreciate any feedback:
>
> "As you go up the AM dial for the same amount of power the
> groundwave gradually decreases while the skywave increases.
>
> Is there an approximation of a formulae that calculates
> these relationships, while eliminating other variables such
> as ground conductivity, terrain, etc.?
>
> I see that stations in the X band of 1600-1710 kHz are
> limited to 10kW daytime and 1kW nightime.
>
> Is this limitation perhaps a result of the enhanced skywave
> and potential mightime interference in northern latitudes in
> winter on the X band, resulting in a 1kW nightime maximum?"
>