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R52H - RB333 and TxPower settings
Posted: Fri Jan 11, 2008 1:44 pm
by alessio
Hi everyone,
I set a RB333 with a R52H miniPCI card inserted.
After initial settings all was working well, than I tried to optimize the Wireless LAN parameters to understand well what was happening changing them.
After I changed the Tx-power parameters from
"Tx-power Mode = card rates, TxPower=17dBm"
to
"Tx-power Mode = card rates, TxPower=30dBm"
the card initially worked, even if not so very well, but after more or less 2 minutes it seems to be died and touching it, it was really hot.
Now, If I try to switch on the Wireless LAN Interface I cannot see any wireless signal.
Is it a limitation about the Tx-Power?
Did I burn the miniPCI card?
Anyone experience?
Re: R52H - RB333 and TxPower settings
Posted: Fri Jan 11, 2008 3:29 pm
by Diganet
Hi everyone,
I set a RB333 with a R52H miniPCI card inserted.
After initial settings all was working well, than I tried to optimize the Wireless LAN parameters to understand well what was happening changing them.
After I changed the Tx-power parameters from
"Tx-power Mode = card rates, TxPower=17dBm"
to
"Tx-power Mode = card rates, TxPower=30dBm"
the card initially worked, even if not so very well, but after more or less 2 minutes it seems to be died and touching it, it was really hot.
Now, If I try to switch on the Wireless LAN Interface I cannot see any wireless signal.
Is it a limitation about the Tx-Power?
Did I burn the miniPCI card?
Anyone experience?
R52H only has 25dBm of TX power so you propably burned the card after being overloaded for a while.
Regards
Henrik
Re: R52H - RB333 and TxPower settings
Posted: Fri Jan 11, 2008 4:06 pm
by alessio
Thank you Henrik,
I believe to have understood really well (now) how to use this parameter.
Just the last doubt, the "burning" should not be happen if I set the antenna gain parameter (for example to 10dBi) , because of the TxPower trasmitted on the miniPCI should be the differences between TxPower and Antenna Gain.
Could you confirm it?
Regards,
Alessio
Re: R52H - RB333 and TxPower settings
Posted: Sun Jan 13, 2008 2:41 am
by Diganet
Thank you Henrik,
I believe to have understood really well (now) how to use this parameter.
Just the last doubt, the "burning" should not be happen if I set the antenna gain parameter (for example to 10dBi) , because of the TxPower trasmitted on the miniPCI should be the differences between TxPower and Antenna Gain.
Could you confirm it?
Regards,
Alessio
If you set the TX power mode to manual TX power then RouterOS doesn't care about antenna gains and TX with whatever value you set it to
/Henrik
Re: R52H - RB333 and TxPower settings
Posted: Sun Jan 13, 2008 5:50 am
by jwcn
Which is why you should leave the power setting at default
Re: R52H - RB333 and TxPower settings
Posted: Sun Jan 13, 2008 12:49 pm
by alessio
Thanks Henrik for your help.
Thanks jwcn for your tip, but I think that the default parameter values are correct, probably the best parameters in most of configurations, but they doesn't allow you to optimize your setup.
Fortunately, from an economic point of view it is not a so strong damage.
Regards,
Alessio
Re: R52H - RB333 and TxPower settings
Posted: Thu Mar 06, 2008 11:45 am
by uldis
here is a note from the manual:
The tx-power default setting is the maximum tx-power that the card can use. If you want to use larger tx-rates, you are able to set them, but do it at your own risk! Usually, you can use this parameter to reduce the tx-power.
In general tx-power controlling properties should be left at the default settings. Changing the default setting may help with some cards in some situations, but without testing, the most common result is degradation of range and throughput. Some of the problems that may occur are: (1) overheating of the power amplifier chip and the card which will cause lower efficiency and more data errors; (2) overdriving the amplifier which will cause more data errors; (3) excessive power usage for the card and this may overload the 3.3V power supply of the board that the card is located on resulting in voltage drop and reboot or excessive temperatures for the board.