10-27-2006, 03:51 AM
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Join Date: Aug 2005
Location: Blenheim, New Zealand
2. 50 ohm coax, and at the very minimum I'd suggest using Times Microwave LMR400. Over 20m this would attenuate the signal by about 4dB. Even lower loss rigid cable would be better, for example Andrew HELIAX or an equivalent product. Study the specifications of any cable you consider and check its figure for loss at 2.4GHz; this will help in finding a suitable cable.
3. It all depends what you want to use it for; i.e. the distance and the size of the area you need to cover.
Assuming you use the LMR400 cable above, plus taking into account pigtail and connector loss, all a 7dBi antenna will do is somewhat make up for the possible 6-7dBi insertion loss, so you would probably end up with less signal than the AP with its OEM antenna directly connected.
This is why long cable runs should be avoided if possible, and why good quality cable needs to be used if long runs are necessary.
If it is possible, consider mounting the AP closer to the antenna and using a long Ethernet cable. You can even run DC power over the unused pairs Ethernet cable using suitable injectors.