On 2008/01/24 10:11, Pau Amaro-Seoane wrote: > connected through a standard (typically: Reverse) SMA-connector. Next, > get a sufficiently long, low-loss cable and a parabolic antenna (some
Low-loss microwave transmission cable is expensive and thick, (0.2dB/m loss on 11mm cable which wouldn't fit an SMA connector so you'd need an adapter or pigtail, expect to pay at least 3eur/m; short runs you can use 5mm cable with 0.5dB/m loss at about half the price, which does fit SMA). If you can put the USB adapter outdoors with the antenna directly connected, that will keep loss to a minimum. If not, use as short as possible LMR200-type cable, and have the main length as a USB extension (if you need longer than USB allows, use another computer to connect to the wireless network running NAT, and connect to that by ethernet; soekris/pcengines board are useful for this). You might also want to think if you need some protection against lightning. At the very least unplug if an electrical storm is nearby... > 24 dBi gain, e.g.), mount the antenna at a point having preferably Maximum power you are allowed to radiate from the antenna in Europe under ETS300/328 is 20dBm (100mW), otherwise you need a license. With a 50mW (17dBi) radio like the ones you show, you're only legally allowed to use an antenna with 3dB gain unless you have software control to reduce transmit power (or use lossy cable etc). > A few images showing what type of USB WLAN "dongles" I am having in > mind are something like this no. 1 Images of the cases don't help much. If you can't get information about the type of MAC/radio used, see if you can get a copy of the Windows driver and you'll find the vendor and device id in the inf file, you can look this up in sys/dev/pci/pcidevs and see if there's a driver which claims the device.
