RadioOS Bis is a software for wireless, point-to-point data transmission using dual 802.11a radio. It may be used with dedicated hardware platforms, eg. RouterBOARD RB433.
RadioOS Bis uses Frequency-Division Duplex (FDD) which divides communication into two radio interfaces operating on different frequencies. One of the radios is used exclusively for transmission, while the other one is used only for reception. Necessity of having a carrier multiple access control mechanism is eliminated. Thus, it is possible to achieve real, effective transmission speeds close to so-called raw radio bitrate speeds.
RadioOS supports IEEE 802.11a radio modules based on Atheros chipsets. In particular, it can work with:
AR5414 - eg. Ubiquiti XR5, UB5
AR5213 - eg. Wistron CM9, Ubiquiti SR5
For proper usage, either two single-polarized antennas are required or one dual-polarized antenna may be used. In first case two antennas need to be separated from each other as far as possible (at least 2 meters). For a dual-polarized antenna, it must have at least 40dB of port-to-port separation. It is recommended to use quality products of renown vendors, like MTI, Mars, Jirous, Cyberbajt (DishEter Duo 23 and DishEter Duo 28).
Take special care about antenna alignment.