At 12:54 PM +0200 5/19/05, Michael Renzmann wrote:
>>I look for recommendation to make TxPwer lower than 0dBm.
>Setting of txpower is available in madwifi-bsd only. In addition this functionality isn't calibrated by now, so you won't get the results you're expecting at all.
>>Our regulatory set maximum EIRP power in 802.11a to 14dBm
>>EIRP. But we use the parabolic antenne with 26dB gain, then
>>we must set txpower to cca -10 dBm.
>That's a problem with your setup. If only 14dBm EIRP are allowed, you shouldn't make use of antennas that have a gain of 26dBi.
>You either should consider a split-antenna-setup, with using the 26dBi antenna for RX only and an antenna with lower gain for TX. Or make use of one lower-gain antenna and attach a device that electronically increases the RX-gain.
>>Unfortunately, the Madwifi doesn't go under 0dBm.
>Do you know any WLAN product that would allow this at all? I don't.
It's difficult when English is not your native language. I think what he is trying to say is that he wants to use a 26 dB gain antenna and that in his regulatory domain the max EIRP is only 14 dBm. Assuming 2 dB of cable loss, he needs to set TX power to -10 dBm to meet regulatory requirements. It's actually an interesting question. I've been spending so much time in the upper U-NIII I hadn't thought about very low power issues. I'm suspect he's right that most Atheros hardware designs can't do down that low, but Greg or someone should confirm that.
So I think the answer is that in that in his regulatory domain he either has to us an attenuator or lower gain antenna.
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Lawrence E. Bakst