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

[Rob Matherly]

<---
The formula you cited does apply in that region of trhe spectrum, except
part of the rules provide for a special allowance if you operate between
510 and 1705 kHz.  See Sec. 15.219.  The rules allow operation in that part
of the spectrum with 100 mW total maximum input to the final amplifier
(excluding filament power), and antenna/transmission line/ground lead
combined length of 3 meters maximum.  And any emission outside that band
must be 20dB down from the unmodulated carrier.  I've been able to pick up
a rather poorly designed and installed Part 15 AM transmitter for more than
a quarter mile.
--->

Ah HA!  That's perfect for what I'm wanting to do... OTR shows sound better
on the AM band anyway :^)  Plus the 1/4 mile range is great, that will
allow me to take a little handheld radio up to the neighbor's pond when I
go fishing.  Of course you say that's a poorly designed and installed
transmitter... how far could I get with a good one??? :^)

What would you use for an antenna that's only 9 foot long at that
wavelength?  If you were to wind a massive coil, would the length of the
finished coil be what you measure or would you measure the length of the
wire that you used to wind the coil?

Maybe a massive pi network in the box with the transmitter, and then attach
a couple 4.5 foot lengths of wire to each side of the box?

(Yes, I know a meter isn't exactly 3 foot, I'm rounding :^))

<---
There is also Sec. 15.225, "Operation within the band 13.553-13.567 MHz."
This allows you to radiate 10,000 microvolts per meter at 30 meters.  This
means in any or all directions.  This obviously equals 100 microvolts per
meter at 300 meters.  It's not bad.  Of course, you'd require a short-wave
receiver, but I'll bet you have one or two of those lyinmg around.
--->

Yeah, but it doesn't go above 13 unfortunately...  Aren't there
experimenters there like there are in the 1750 band?  I've thought about
whipping up a little rig to operate there, but never have got around to it
:^))

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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