Joe,
Very roughly, Line of sight with no major reflections, X x power =3D
sqrt(XX) x range.

So 12.5 * power =3D sqrt(12.5) or about 3.5 x the range.

(And yes, there will be exceptions to this).

RP

On 28 July 2010 10:48, ivp <joecolquitt@clear.net.nz> wrote:
>> The maximum permitted power level is 25mW BTW. The transmitter
>> datasheet says its output is 3dBm typical at 3V, supply current 10mA
>
> I meant to add that 3dBm, according to
>
> http://www.referencedesigner.com/rfcal/cal_01.php
>
> is only 2mW, so there is quite some scope for more tx power, even
> though these modules do pretty well at the target range anyway
>
> Joe
>
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