Another post about 40 MHz :o)
The ISM (Industrial, Scientific, Medical) band goes from 40.660 to 40.700 MHz and is intended for use by a range of very low power devices. I came across some information recently about a garage door remote control system which operates in the band.
40.66 MHz 40.7 MHz B 40.68 MHz Worldwide
HÖRMANN HSM4 40 MHZ
40.685 MHz
Hormann Garador HSM4 Garage Door Remote Control Keyfob Transmitter - 40.685MHz - Grey Buttons
It just goes to show that the band is not completely empty and radio amateurs should probably avoid using the ISM band especially in built up areas.
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