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Forums » Industry Forums » Wireless Service Providers » Antennas and dBi
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Weird cordless phone interference »
« Tranzeo PTP radios good?  
JasonWISP

join:2004-06-29

Antennas and dBi

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
permalink · 2005-10-15 10:47:51 · Reply to this

IntraLink
Premium,MVM
join:2002-08-14
Utah Valley

Re: Antennas and dBi

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.
permalink · 2005-10-15 11:06:23 · Reply to this
JasonWISP

join:2004-06-29

Re: Antennas and dBi

Ah. Well, for example, a home made antenna. Like a cAntenna, or something.

Any ideas?

Best Regards,
Jason
permalink · 2005-10-15 11:07:54 · Reply to this

Anav
Sarcastic Llama? Naw, Just Acerbic
Premium
join:2001-07-16
Dartmouth, NS		 If your going to be using homemade antennas for a WISP, your probably not going to get far.
permalink · 2005-10-15 12:00:22 · Reply to this
JasonWISP

join:2004-06-29

Re: Antennas and dBi

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
permalink · 2005-10-15 12:01:50 · Reply to this

John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp
·CenturyLink

Re: Antennas and dBi

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
permalink · 2005-10-15 13:26:16 · Print · Reply to this
JasonWISP

join:2004-06-29

Re: Antennas and dBi

Thanks John! That helps a lot.

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

Best Regards,
Jason
permalink · 2005-10-15 13:32:10 · Reply to this
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