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moly
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Ubiquiti UB5 - power regulation problem

Sun Dec 28, 2008 11:11 pm

Hi, I have new Ubiquiti UB5 minipci card and test it in network.
And have litle problem with power regulation, If I set 14dB or more, all is ok. On remote side i have -60dBm.
If I set 13dB or less, link is disconnected, and on remote side I see siganl -90dBm.
I try ROS 3.15 and 3.17 and 4 UB5 card, same problem.

Thanks for some solutin

Moly
 
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sergejs
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Re: Ubiquiti UB5 - power regulation problem

Tue Dec 30, 2008 3:46 pm

It should be because of the power offset (10db for example). When you set in routeros tx-power=15, in eeprom the value is 5. When you set the tx-power 14 or lower, in eeprom the value is 4 or lower and I think that the
eeprom value is too low and the tx-power isn't so linear at that level and output power goes very low. Contact the manufacturer to get the information about the offset.

There is no need to use high power wireless cards if you need to only up to
14db output power.
 
moly
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Re: Ubiquiti UB5 - power regulation problem

Fri Jan 02, 2009 7:41 pm

Thanx, I send question to Ubiquiti.
I don't need it for high output power, but for very good RX Sensitivity and standart size.
For longer distance I use DCMA-82, but this is bigger and in one routerbord is possible insert one, may be two. There`s not so space in miniPCI.
As soon as I receive answer, I post it here.

Thanx

Moly
 
moly
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Re: Ubiquiti UB5 - power regulation problem

Tue Jan 13, 2009 11:53 am

Hi, I receive some information on ubiqiti forum. Power offset may be same as the "R52H".
http://forum.ubnt.com/forum/viewtopic.php?t=5175
Good power control is important for copliance telecommunications condition, in my country is maximum EIRP 30dBm for 5,4GHz. We use hi gain antena an low power from radio card.

Thanx for help

Moly
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janisk
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Re: Ubiquiti UB5 - power regulation problem

Tue Jan 13, 2009 3:19 pm

R52H have non offset value for tx-power settings - what you set is what you get.
 
taylorc
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Re: Ubiquiti UB5 - power regulation problem

Mon Mar 16, 2009 4:46 am

There is no need to use high power wireless cards if you need to only up to
14db output power.
True... The problem is that you rarely know you only need 14dB of power or less until after equipment installation at a customer's site. It is preferable to err high and back the power off than err low and have to swap out a radio module in the field.

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