[SOC] Unlicensed FM or AM brodcasting to my yard...

[Rob Matherly]

I'm wanting to whip something up to listen to stuff (mostly OTR shows)
that's played with my computer out in the yard and around the house on an
AM or FM radio.  I've been checking around on maximum allowable unlicensed
part 15 (whew) power levels to make sure I don't get busted for anything.
At FM it's 250uV@3m (according to one site that works out to 18.7nW to an
isotropic) and on AM it uses a formula of XuV per meter measured 30m from
the antenna, where X is figured up with the formula 24000/F(kHz) (the 30m
is extended to the edge of the campus of educational places).

Here's the point of all this:

1. How do I convert uV/meter to wattage

2. I have a big yard (about 3 acres)... if I was to go with FM part 15
would 18.7nW cover all that?  The cordless phone works fine all over the
yard, how much power do those put out?  I could compare the two I
suppose...

3. How the heck do I design something that only puts out 18.7nW? :^)))
Talk about QRPpppppppppppppppppp :^)

Btw, checked into stuff that you buy.  I don't want to spend 70 bucks on
something that just plugs into my soundcard :^)  Also checked into LPFM...
doesn't look like they'll be accepting new licenses anytime soon.  Plus I'm
not an organization... unless I create something called: "The Society For
Broadcasting of Old Time Radio and Whatever Else I Feel Like Listening To
Out In The Yard" :^)

I suppose I could get a mp3 player, but where's the fun in that? ;^)

72/73/oo
Rob, W�JRM
ARRL; FP Qrp -330; Live-Wire #442; IA QRP #143; SOC #497; QRPp-I #19

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