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Transmit with 2 R52nm

Posted: Thu Dec 30, 2010 7:27 pm
by Fumi
I try to transmit simultaneuos with 2 R52NM and performance is low..

1.- Only transmit wlan1<--->wlan1 bandwidth test UDP:220Mbps
2.- Only transmit wlan2<--->wlan2 bandwidth test UDP:220Mbps

3.- Transmit simultaneous wlan1 and wlan2 ant bandwidth test is slow.. 120 Mbps for radio.


I try to down tx power to 5 and I have good separation with antennas and pigtails.. I don't know what is the problem...

Re: Transmit with 2 R52nm

Posted: Fri Dec 31, 2010 1:08 pm
by Fumi
I have make more test and I can say that 2 radios transmit simultaneous can be work in 5Ghz-onlyN. There is no problem with interference. I test with separate boards and it's work but when I put two radios in same board it fail... :(

Re: Transmit with 2 R52nm

Posted: Fri Dec 31, 2010 2:31 pm
by roc-noc.com
Have you measured the power draw when transmitting with both radios?

The RB52Hn takes a lot of power and transmitting will be the highest usage.

Just a guess but maybe you are running out of power.

Tom

Re: Transmit with 2 R52nm

Posted: Fri Dec 31, 2010 2:42 pm
by Fumi
I have POE Gigabit 40W I think power its not the problem

Re: Transmit with 2 R52nm

Posted: Sun Jan 02, 2011 5:31 am
by Belyivulk
I'd suggest check your LMR cables - and separate your antennas more. the N radios are super sensitive to noise (or so we've found) we've had more than one leaky cable cause us trouble!

Re: Transmit with 2 R52nm

Posted: Mon Jan 03, 2011 11:05 am
by Fumi
I try with same cables and same distance but with separate routerboards:

RB1 (1Radio)<-------------> RB2 (1Radio)
RB3 (1Radio)<-------------> RB4 (1Radio)

In this situation there is no problem, but the problem is when I use 1 RB with 2 radios.

Re: Transmit with 2 R52nm

Posted: Mon Jan 03, 2011 10:14 pm
by Belyivulk
I suppose thats because they are highpower and stacked, in an RB4xx series at least. Let me know if you ever get this to work :) It could explain why we have some poor performing links shared with high power N cards :)

Re: Transmit with 2 R52nm

Posted: Sun Jan 09, 2011 10:22 pm
by Fumi
I try to down tx power to minium value, then the consumption for each radio is lower.. But the problem persists.

There is a way to make double link simultaneous?

Thanks for all!