Are directional antennae illegal for laptops that get 100 m range for bluetooth?

Question

100 meters is the max limit for bluetooth omnirange to prevent radio congestion. Wouldnt focusing it further in a certain direction make the signal 5 times as strong and thus illegal?

thanks

Answer 1

not illegal.

Limits are set so that manufacturers can design their products to work within certain use cases. Higher power might cause a product to interfere with other nearby products.

However, I know of cities in rural areas that have set up repeaters using directional antennas on standard wifi routers to get internet access in town. The same could be done with bluetooth. While this is not strictly illegal, the FCC could always come along and force you to shut down if your transmission was interfering with something else...

Answer 2

the limit for wi-fi is 1 watt (or +37 DBM)

(i think)

the reason for limiting beam strength is top prevent interference with satellite uplinks, which use the same channels.

in the new wi-fi standard (802.11 DRAFT-N) all radios agree to help each other out and they relay for each other.,

thw last mile is free.

Answer 3

the airways are free for all to receive transmissions, police scanners etc., if they want to jam or encrypt the signals that is their business, have you seen shows about people driving by picking up the frequencies of people's wireless security cameras? you better put a wired one!