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FabFab10
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811 N Nstreme 20 km link

Tue May 22, 2012 7:30 pm

Hello everybody, i have setup a 20 km 5 Ghz mimo link using rb433AH + R52Hn + 60 cm 29 dbi solid dishes going from mountain top to mountain top.
LInk is perfect with good weather but when some heavy rain is around i lose connection.
I?m using Nstreme protocol with all HT- AMPDU enabled, supported MCS 0,14,15 and basic MCS 0.
Do you have any suggestion on how make this link more reliable, even if i have to lose some bandwith is not critical.


thanks in advance
 
rodolfo
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Re: 811 N Nstreme 20 km link

Tue May 22, 2012 9:33 pm

1. update to 5.16
2. rise the hardware-retry to 10 or 15
3. set data rate to 'advanced'
4. use A instead N
5. disable data rates over 24Mbit

try these settings one by one and discover which is for you (for shure 4 and 5)
rodolfo
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FabFab10
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Re: 811 N Nstreme 20 km link

Tue May 22, 2012 11:07 pm

Thanks rodolfo for answering.

1. update to 5.16
It is already version5.16

2. rise the hardware-retry to 10 or 15
It's already to 15

3. set data rate to 'advanced'
already done

4. use A instead N
this i dont understand why....

i've tried something else: disabling chain 1 and leaving only chain 0 the signal became stable and i got CCQ 100%, then i enabled MCS 6 and MCS 7 and could have 100% CCQ at those rates as well.

To undersand better, by diabling chain 1 i'm using a single polarity right now??

thanks in advance
 
ddd
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Re: 811 N Nstreme 20 km link

Wed May 23, 2012 3:30 am

Whats your signal levels?
 
FabFab10
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Re: 811 N Nstreme 20 km link

Wed May 23, 2012 10:20 am

Right now with bad weather around -68 or -69, it was -62 / -63 with good weather
 
rodolfo
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Re: 811 N Nstreme 20 km link

Wed May 23, 2012 10:37 am

yes, disabling one channel you use only one polarity.

in wireless interface wlan1:
- in Wireless Band set 5Ghz-A instead of 5Ghz N.
- In data rates
- set Rate=configured
- in 'supported Rates A-G' select only: 6,9,12,18,24
rodolfo
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FabFab10
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Re: 811 N Nstreme 20 km link

Wed May 23, 2012 11:19 am

Ok so it's just one polarity.
Does it make sense to enable tx on chain 0 and rx on chain 1 and on the other unit vice versa or is better to leave everything on chain 0?

thanks
 
ddd
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Re: 811 N Nstreme 20 km link

Thu May 24, 2012 1:31 am

Try using NV2 as the wireless protocol.

Also do a spectrum scan during good and bad weather to see if there is interference on or near your channel. Are there other radio devices near yours?
/interface wireless spectral-history wlan1 range=5ghz
 
FabFab10
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Re: 811 N Nstreme 20 km link

Thu May 24, 2012 11:17 am

Ok i will try, but does it make any sense to use 802.11N with one chain with tx on chain 0 and rx on chain 1 and vice versa?
or should i leave it both on the same chain?

thanks
 
taduikis
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Re: 811 N Nstreme 20 km link

Thu May 24, 2012 11:42 am

You are right. I see no sense to use only one chain in dual polarity setup. It's like airplane flying with only one engine. I'm sure something can be done to make it work in full setup.
 
whitenoise
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Re: 811 N Nstreme 20 km link

Fri May 25, 2012 10:47 am

90 cm for 20km

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