MikroTik

Posted: **Wed Aug 20, 2008 8:45 am**

Just trying to turn the transmit rates on a wireless card I'm using with a high gain antenna.
unsure as to which value is the actuall transmit power

I have a 16dBi antenna with 1m of LMR400 and a Ubiquiti SR2 card so I belive I should be transmitting at a max of 100mW (20dBm)
Is the Tx Power value here the actual transmit power or is the one that's displayed in brackets (currently only 10dBm as it shows in the pic) the correct one?

Posted: **Wed Aug 20, 2008 1:55 pm**

Have a look at this.
http://www.ubnt.com/downloads/ubi_mtik_power.pdf

-Louis

Posted: **Fri Aug 29, 2008 7:27 pm**

Thanks, that explains all I need to know.

Study Overview and Background
One of the popular topics of discussion concerning Ubiquiti's hi-performance radio card offerings
has to do with the driver reported transmit power levels and how they correspond to the actual
output power of the card. Because of fixed power limitations in versions of the Atheros Linux
MADWIFI driver, Ubiquiti has implemented power "offsets" as a work-around for OEM customers
using driver versions with the power limitations to achieve maximum output power. Mikrotik is the
only known 3rd party software to take into account Ubiquiti's power offset in their user interface for
some, but not all, of Ubiquiti's radio cards.

To sumarise what I gleaned from that, the Ubiquiti cards are set to give a higher output than what they say due to the madwifi driver not supporting the high power output (26dBm) so mikrotik has made corrections for these specific cards, meaning when I put in a value, like the case above of 20dBm, the mikrotik sends the command to the SR2/SR5/SR9 as "10dBm" and the card ACTUALLY outputs 20dBm as it is set to do.

As of 8/2007
Radio | Max Programmed Power | Max Actual Power | Power Offset | Mikrotik Correction for Offset
SR2      16dBm                  26dBm              10dB           YES
SR4      19dBm                  26dBm              7dB            NO
SR5      19dBm                  26dBm              7dB           YES
SR9      16dBm                  28dBm              12dB          YES
XR2      18dBm                  28dBm              10dB          NO
XR3      15dBm                  25dBm              10dB          NO
XR5      18dBm                  28dBm              10dB          NO
XR9      17dBm                  27dBm              10dB          NO

Posted: **Tue Sep 30, 2008 10:26 pm**

I have a routerboard crossroads and I want to make sure I'm not overdriving it. The tx-power mode is set to default so I should be good right?

Posted: **Wed Oct 01, 2008 12:40 pm**

You can lower the TX-power if you want - set the crossroads tx-power mode to card-rates and the tx-power to 26.
Or you can leave it default - that also will work stable.

Posted: **Wed Oct 06, 2010 9:55 pm**

Does Mikrotik radios such as R52H or R5H have any offset or the Manual TX power that it set it the real TX power that I get?

Thank you.

MikroTik

tx power rates, which is the real one?

tx power rates, which is the real one?

Re: tx power rates, which is the real one?

Re: tx power rates, which is the real one?

Re: tx power rates, which is the real one?

Re: tx power rates, which is the real one?

Re: tx power rates, which is the real one?