Antennas and dBi in Wireless Service Providers http://www.dslreports.com/forum/r14583772 en Sat, 28 Nov 2009 17:43:04 EDT Sat, 28 Nov 2009 17:43:04 EDT Re: Antennas and dBi http://www.dslreports.com/forum/remark,14584691 JasonWISP : Thanks John! That helps a lot.

I thought that might be it, but it wasn't clear when searching for it.

Best Regards,
Jason]]> http://www.dslreports.com/forum/remark,14584691 Sat, 15 Oct 2005 13:32:10 EDT Re: Antennas and dBi http://www.dslreports.com/forum/remark,14584656 John Galt :
said by JasonWISP See Profile :

Yes, I understand. This wouldn't be for a WISP. But, just in general.
Manufacturer's typically use "antenna ranges" which are facilities set up for testing antennas of a variety of types.

For example:

»www.edorss.com/pdf/Antenna_Test_···ties.pdf

Simply put, the antenna under test is measured against a reference antenna, and that antenna parameters are determined from that.

Using your Cantenna for an example, they put that on a rotating platform at a distance and apply a constant signal to the reference antenna. Then they rotate the platform slowly and record what the received signal levels are at your Cantenna. This yields the antenna plots that are usually available for every manufacturer's antennas. See some here (at the bottom of the page):

»www.hyperlinktech.com/web/hg2414hsp-090.php

That is basically how it is done...
--
A is A]]> http://www.dslreports.com/forum/remark,14584656 Sat, 15 Oct 2005 13:26:16 EDT Re: Antennas and dBi http://www.dslreports.com/forum/remark,14584144 JasonWISP : Yes, I understand. This wouldn't be for a WISP. But, just in general.

If it's off topic, please direct me to the right place. I'm sorry. :)

Best Regards,
Jason]]> http://www.dslreports.com/forum/remark,14584144 Sat, 15 Oct 2005 12:01:50 EDT Re: Antennas and dBi http://www.dslreports.com/forum/remark,14584139 Anav : If your going to be using homemade antennas for a WISP, your probably not going to get far.]]> http://www.dslreports.com/forum/remark,14584139 Sat, 15 Oct 2005 12:00:22 EDT Re: Antennas and dBi http://www.dslreports.com/forum/remark,14583878 JasonWISP : Ah. Well, for example, a home made antenna. Like a cAntenna, or something.

Any ideas?

Best Regards,
Jason]]> http://www.dslreports.com/forum/remark,14583878 Sat, 15 Oct 2005 11:07:54 EDT Re: Antennas and dBi http://www.dslreports.com/forum/remark,14583866 IntraLink : Calculating the physical dBi in an antenna is actually very involved and difficult.

All manufacturers should give you the gain in dBi with their specs on the antenna.]]> http://www.dslreports.com/forum/remark,14583866 Sat, 15 Oct 2005 11:06:23 EDT Antennas and dBi http://www.dslreports.com/forum/remark,14583772 JasonWISP : Hello WISPs!

I'm not a WISP yet, but I would like to understand something...

I've searched, searched, and searched and I had got headaches. So, I decided to post here. If I'm at the wrong place, please let me know.

I would like to know how you calculate the dBi in an antenna. Is there some formula to this?

Thanks!

Best Regards,
Jason]]> http://www.dslreports.com/forum/remark,14583772 Sat, 15 Oct 2005 10:47:51 EDT