[Amps] ARF1505

[Dave Haupt]

27.12 MHz is one popular ISM frequency.

13.56 MHz is probably the most popular.  Tune any
receiver to 13.56 MHz and you'll always hear a
carrier, usually a bit wobbly and often with AC hum. 
Gigawatts of power are used at 13.56MHz as
lumber-drying kilns in the Pacific Northwest, and it
is the most-used frequency for plasma etch processing
in semiconductor fabrication.  There are thousands of
50kW 13.56 MHz generators sold every year into the
semiconductor industry.

The ISM frequencies, per FCC rule 18.301 are:

ISM Frequency Tolerance
6.78 MHz +/- 15.0 kHz
13.56 MHz +/- 7.0 kHz
27.12 MHz +/-163.0 kHz
40.68 MHz +/- 20.0 kHz
915 MHz +/- 13.0 MHz
2,450 MHZ +/-50 MHz
5,800 MHz +/-75.0 MHz
24,125 MHz +/- 125.0 MHz
61.25 GHz +/- 250.0 MHz
122.50 GHZ +/- 250.0 MHz
245.00 GHz +/-1.0 GHz

Generally, on an ISM frequency, you can generate as
much power as you want, and even radiate it, as long
as you are NOT using the energy for communicating. 
So, you could be doing radar, or you could be drying
lumber, searching for cancerous tumors, or other such
things, but you can not be sending information (voice,
data, CW, RTTY, etc).  No license required.

Note that 6.78, 13.56, 27.12, and 40.68 are all
harmonically related - this is intentional.  A "cheap
dirty" power generator on 13.56 is likely to generate
harmonics, therefore the harmonic frequencies are as
legally uncontrolled as the fundamental.

Perform a Google search on any of those frequencies
(e.g. "27.12 MHz") and you'll come up with lots of
links to experiments about using RF energy to weld
plastic, seal bags, cure cancer, and so on.

73,

Dave W8NF
Not at Dayton this year....


		
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