plase tell me best best setup for long range links whit SR5 cards…
Aslo how to setup power on SR5?
MAN! that’s a trick quistion.
Start with the biggest solid dish you can afford(29db or higher). Then set the power on the SR5 card to default, make sure you have good LOS and fin turn the dish to get every extra db you can get.
Also make sure you have a short cable run of LMR600(no more then 3 feet)and get a good pigtail that can handle up to 6ghz.
Set one unit as station and the other as ap-bridge so you can get them pointed, then you can add wds or what ever you need. KISS on setups.
I have a bunch of 5.8 link in New Orleans that range from 1 to 6 miles and they are all running great even with the dirty RF noise in this city.
Then, if you’re going for range instead of speed, lock the speed of each end of the link to 24Mbit, which gets you the 400mw the card can produce. If you let the speed go higher than 24Mbit, the card starts reducing the power output.
How long is the link?
I would sugesst to set the freq on SR5 5800 in turbo mode. We have tested it and mesured it and it works best on thouse freq. It transmits full 400mW.
Can anybody definitively say what’s up with the power level vs. frequency vs. rate with these cards? Elsewhere on this board I’ve read that the SR5 reduces power when run below the 5.8 band. Here on this thread there’s a hint of that:
“I would sugesst to set the freq on SR5 5800 in turbo mode. We have tested it and mesured it and it works best on thouse freq. It transmits full 400mW.”
but at the same time someone else says:
“…lock the speed of each end of the link to 24Mbit, which gets you the 400mw the card can produce. If you let the speed go higher than 24Mbit, the card starts reducing the power output.”
The power limit on the lower band makes sense, so does the reduction in output power vs. speed, but the first quote does not seem consistent with the second.
Anybody at Mikrotik care to offer a definitive answer?
Do a web search for SR5 cards and look at the specs. As the speed of the link is increased above 24Mbit, the power output of the card is reduced. 24Mbit is the highest rated speed that still produces 400mw output. By the time you get to 54Mbit, the output drops to 100mw.
Then do a search for the 802.11a channel allocations for your area. In the US, that chart usually shows you that on certain frequencies you’re required to reduce the output to stay legal and are only allowed certain uses, like indoors only, or point to point.
We have tested link on 3km with sr5 cards locked on 48MBit/s it gets troughputh of 53 MBit/s HD. And the signal stays the same on every datarate.
Yeah, good idea (doi!) , and for the sake of completeness, from Ubiquiti datasheet:
Radio Output Power (at connector)
400mW (26dBm) 1-24 Mbps
251mW (24dBm) 36 Mbps
159mW (22dbm) 48 Mbps
126mW (21dBm) 54 Mbps
Sensitivity @FER=0.08
6 Mbps -94 dBm
9 Mbps -93 dBm
12 Mbps -91 dBm
18 Mbps -90 dBm
24 Mbps -86 dBm
36 Mbps -83 dBm
48 Mbps -77 dBm
54 Mbps -74 dBm
Does it work to have fixed power at all rates?
can anyone assist me with how to lock the speed of each end of the link to 24Mbit…i will love ur step by step config.
you have Data-Rates setting and there you define rates that you would like to use