09-10-2013 02:15 AM - edited 07-04-2021 12:48 AM
Hello,
just a question, what happens if you install single band antennas onto dual band ap connectors, would it work?
greets
J.
09-10-2013 03:52 AM
It will work, but you will only be able to transmit from the radio that the antenna is made for. So if its a 2.4ghz antenna and you put that on a 3602 for example, then you need to disable the 802.11a radio and it will not work for that band.
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09-10-2013 05:17 AM
Hey Scott,
Good to know, thx
Greets
09-10-2013 06:42 AM
I think that's a bad idea. You should look at some physical parameters of the antenna and the AP itself. What kind of models do you use?
Check these links and read more about VSWR ( Voltage Standing Wave Ratio) , antenna Impedance:
09-10-2013 06:51 AM
I understand, so let me clarify why Insaid what I said.
It's not something everyone does, there have been post in the past where users have migrated from 1242's for example to 2600's or 3600's and still want to use the same AP's temporarily. Normally, you would want to purchase new antennas and that is the norm, but in very few cases, antennas need to be reused in which it will work, but not recommended.
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09-10-2013 07:01 AM
I agree that it should work and it can work, if all the antenna/ connector parameters matches.
But if it does not match, antenna can warm up, catch the fire and possibly burn the building.
09-10-2013 09:43 AM
That would be a dramatic outcome...
The test case would be a bridge link on two 2602e access points with AIR-ANT5170P-R antennas over 500m, the antenna connectors only connect to 2 of the 4 access point connectors.
The customer had already bought these items and wants to install these between 2 buildings over 400 meters.
It's not recommended, but I guess it should work
any other drawbacks?
thx in advance
J.
09-10-2013 09:51 AM
It is not only possible its actually one of the ways to use some of the antennas released for 1552-series. There are antennas that are released for the use with only single band while 1552E has a dual-band antenna feeder.
http://www.cisco.com/en/US/prod/collateral/wireless/ps5679/ps11451/data_sheet_c78-641373.html
http://www.cisco.com/en/US/docs/wireless/antenna/installation/guide/ant5114P.html
09-10-2013 10:00 AM
It will work. But you might expect higher reties and other crazy stuff. You are releasing a wave form from the radio that doesnt match the antenna element.
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09-10-2013 10:10 AM
George,
Why is that? Feeder is dual band and antenna is specified to work with one of the two bands. I don't see any issues using this setup from the RF point of view. ...leaving trivia about non-matching impedence-related issues aside.
09-10-2013 11:05 AM
Vlad my friend you are correct. I read this question as if there was a mis match between the radio freq and the antenna freq.
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09-10-2013 11:08 AM
But yes the antennas are tuned for the freq you plan to use ..
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09-10-2013 10:18 AM
Hi George,
interesting, so this means that the antenna elements are different for dual mode antenas as for single mode antennas and the radio waves comming from the access point are "tuned" towards the type of antenna (single or dual mode).
so in the case of an 1602e access point you can use the AIR-ANT2566P4W-R (dual band, 4 ports) antenna and skip one antenna cable.
but you can not use the AIR-ANT5140V-R (single band, 3 ports) antenna on that 1602e access point and disable the 2.4GHz band.
bottomline, dual mode ap connectors need dual mode antennas
09-10-2013 01:29 PM
You can use MIMO antenna that is single band with MIMO AP connectors that is dual-band provided that the antenna is for WiFi :-)
09-10-2013 02:02 PM
Hey Vlad,
So if I am correct, you can use a AIR-ANT5140V-R (single band, 3 ports) antenna on a 1602e access point and disable the 2.4GHz band.
or use this antenna on the 2602e and only enable the abc connectors.
on the 2602 you can select which antenna connectors you want to enable connector a (single antenna) , ab, abc or abcd, quite confusing if you can only use MIMO antennas i would say.
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