433 is used a lot in the US, inside-outside thermometers for instance.
But there are rules for the field strength, length of transmission,
total transmission etc. that are much stricter than in the ISM bands.
With a typical antenna, 1 milliwatt is probably a close guess. I forget
the transmission time, but it's pretty small, maybe a few minutes per
hour and max per transmission of less than a minute. And no transmitting
at regular intervals. The thermometers get around that one by slightly
randomizing the interval between transmission.

Hope this helps. If you need particulars, when I am in my office I can
quote chapter and verse.

Friendly regards, Bob

On Sat, Sep 27, 2014, at 09:50 AM, meshka7 wrote:
> Got two RF modules off ebay. One for 433 MHz and another for 915. My
> intention was to experiment with RF and remote control.=20
>=20
> Looking into band allocations in the US, I found that these frequencies
> fall
> into the amateur bands. Wikipedia shows that 433 is for ISM but only
> within
> Region 1, so I guess I'm left only with 915.
>=20
> Am I correct here? What bands do people generally use for experimenting
> or
> making home made gadgets that use RF and that won't be sold commercially?
>=20
> Thanks!

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