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HELLO I AM LOOKING FOR A ROTOR WITH Position-Feedback Potentiometer TO CONNECT TO A WIFI YAGI ANTENNA WHATS YOUR CHEAPEST ONE. Need something like this: http://www.rfwel.com/shop/?target=pr...roduct_id=1863
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We don’t gave any with position feedback. Sorry. -
WILL THIS ANTENNA http://www.rfwel.com/shop/?target=pr...&cat=77&page=1
PICK UP MORE SIGNALS THAN THIS http://www.innovativedevice.com/asp/InformationYagi.asp
HOW MANY MILES WILL THIS GO http://www.rfwel.com/shop/?target=pr...&cat=77&page=1Comment
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The first antenna has 18dBi but the 2nd has 24dBi so the 2nd one is more powerful and will pick up more signal. Recall dBi is a logarithmic scale so this is a big difference in gain. However, realize that too much gain is not necessarily better. The higher the gain the higher the transmit power which is good but also the more you amplify distant interferers. Also there are other equally important antenna parameters other than gain including beamdwidth, front-to-back ratio etc. Here is a 19dBi antenna that works very well: http://www.rfwel.com/shop/?target=pr...roduct_id=1302
You cannot predict how far an antenna will go simply from the gain. In fact anyone who claims a certain gain antenna operating at 2.4GHz will go a certain distance without any other disclaimers doesn’t really understand Radio Frequency (even with a clear RF line of sight between the two points which is different from an optical line of sight). True you can probably beam a signal that far but what is more important is whether the SNR will be usable so a lot of times the radio implements error correction coding & other fancy stuff to increase the SNR. Standard 802.11b/g was not designed for long ranges like 10miles and so even if you can get a signal there you will most likely get too much ACK timeouts and your datarate would be pathetic.
Let me know if this answers your question. In our experience if you are trying to do WiFi above above 1/3 mile 500m with slight obstruction or 1 km (0.6miles) with line of sight, you really cant do it with many standard wifi routers even with high gain antennas (if you need decent speed). Above 2-3miles you need special hardware.
Here is some more information on long-distance links: http://www.rfwel.com/bwa/long_range_wireless.phpComment
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