topic Re: Correct distance between antennas for diversity in Wireless https://community.cisco.com/t5/wireless/correct-distance-between-antennas-for-diversity/m-p/1791227#M165459 <HTML><HEAD></HEAD><BODY><P> Thanks</P><P></P><P>I have a customer where the outdoor antannas are placed 1,5 m apart.</P><P>I think i will swtch off one antenna, later shorten the distance and enable diversity again.</P></BODY></HTML> Tue, 15 Nov 2011 06:47:52 GMT pbuch 2011-11-15T06:47:52Z Correct distance between antennas for diversity https://community.cisco.com/t5/wireless/correct-distance-between-antennas-for-diversity/m-p/1791224#M165456 <P>Hi</P><P></P><P>When using external antannas, what are the correct distance beteen them ?</P><P>I guess that it is a fraction of the wavelenght, but what is the formula.</P><P>On a normal 2,4ghz ap the distance is 13,5 cm.</P><P>Is it ok with the double distance ?</P><P>What is the optimal distance ?</P><P></P><P>/Per Buch</P> Sun, 04 Jul 2021 04:04:12 GMT https://community.cisco.com/t5/wireless/correct-distance-between-antennas-for-diversity/m-p/1791224#M165456 pbuch 2021-07-04T04:04:12Z Correct distance between antennas for diversity https://community.cisco.com/t5/wireless/correct-distance-between-antennas-for-diversity/m-p/1791225#M165457 <HTML><HEAD></HEAD><BODY><P>Here is a good post regarding your question:</P><P></P><P><A _jive_internal="true" href="https://community.cisco.com/message/3397345#3397345">https://supportforums.cisco.com/message/3397345#3397345</A></P></BODY></HTML> Mon, 14 Nov 2011 19:15:13 GMT https://community.cisco.com/t5/wireless/correct-distance-between-antennas-for-diversity/m-p/1791225#M165457 Scott Fella 2011-11-14T19:15:13Z Re: Correct distance between antennas for diversity https://community.cisco.com/t5/wireless/correct-distance-between-antennas-for-diversity/m-p/1791226#M165458 <HTML><HEAD></HEAD><BODY><P>Here is another guide that goes over multipath and diversity. They also mention here the distance for both bands and the max distance for external antennas. </P><P></P><P>http://www.cisco.com/en/US/tech/tk722/tk809/technologies_tech_note09186a008019f646.shtml</P><P></P><P>You should look at some of the newer single diversity antennas do you don't have to worry about antennas not being space correctly. </P><P></P><P>Sent from Cisco Technical Support iPhone App</P></BODY></HTML> Mon, 14 Nov 2011 20:56:42 GMT https://community.cisco.com/t5/wireless/correct-distance-between-antennas-for-diversity/m-p/1791226#M165458 Scott Fella 2011-11-14T20:56:42Z Re: Correct distance between antennas for diversity https://community.cisco.com/t5/wireless/correct-distance-between-antennas-for-diversity/m-p/1791227#M165459 <HTML><HEAD></HEAD><BODY><P> Thanks</P><P></P><P>I have a customer where the outdoor antannas are placed 1,5 m apart.</P><P>I think i will swtch off one antenna, later shorten the distance and enable diversity again.</P></BODY></HTML> Tue, 15 Nov 2011 06:47:52 GMT https://community.cisco.com/t5/wireless/correct-distance-between-antennas-for-diversity/m-p/1791227#M165459 pbuch 2011-11-15T06:47:52Z Re: Correct distance between antennas for diversity https://community.cisco.com/t5/wireless/correct-distance-between-antennas-for-diversity/m-p/1791228#M165460 <HTML><HEAD></HEAD><BODY><P>Yeah.. Your better off doing that and adjusting later. Make sure you specify the correct antenna port for tx and rx.</P><P></P><P>Sent from my iPhone</P></BODY></HTML> Tue, 15 Nov 2011 11:46:49 GMT https://community.cisco.com/t5/wireless/correct-distance-between-antennas-for-diversity/m-p/1791228#M165460 Scott Fella 2011-11-15T11:46:49Z Re: Correct distance between antennas for diversity https://community.cisco.com/t5/wireless/correct-distance-between-antennas-for-diversity/m-p/1791229#M165461 <HTML><HEAD></HEAD><BODY><P> It's 1310 bridges configured as ap ... with 2&nbsp; times&nbsp;&nbsp; 5,6db antennas.</P><P>Not much problem there, just diable one antenna.</P><P>They are mounted in the lightpoles ... 5 to 6 m from groundlevel.</P><P>I want to move them down to 3 - 3,5 m, the clients are pc'es in trucks.</P><P></P><P>Lots of things to correct, some of the indoor AP's are with two different antennas.</P><P>I will have to run through all the ap's, correct the installation errors and then convert to LAP</P><P></P><P></P><P>/Per</P></BODY></HTML> Tue, 15 Nov 2011 12:24:55 GMT https://community.cisco.com/t5/wireless/correct-distance-between-antennas-for-diversity/m-p/1791229#M165461 pbuch 2011-11-15T12:24:55Z Re: Correct distance between antennas for diversity https://community.cisco.com/t5/wireless/correct-distance-between-antennas-for-diversity/m-p/1791230#M165462 <HTML><HEAD></HEAD><BODY><P>Understood. I have seen installs where the 2.4ghz and 5ghz were mixed around also. Looks like you have a lot of work ahead of you.</P><P></P><P>Sent from my iPhone</P></BODY></HTML> Tue, 15 Nov 2011 12:28:19 GMT https://community.cisco.com/t5/wireless/correct-distance-between-antennas-for-diversity/m-p/1791230#M165462 Scott Fella 2011-11-15T12:28:19Z