RB112 + SR2 + 15db omni +48v POE .4a = bad pinging

RouterOS Wireless Networking
1

hello guys,


i really have serious problem here i need so i deas help tests,

here is my network

i have RB112 with 1 SR2 card transmitting @ 26db connected throw u.fl connector which is port -b

noise floor -102

and 15db hyperlink pro omni directional

the problems that i have:

1 i just can ues channel 1 or 11 ( another channels i can see it using my laptop but i cannot connect i uesd 3 diffrent laptops and CPE but no luck)

  1. problems with the channnel 1 or 11 the following

very bad ping

disconnctions

suddenly signal drop from -72 to -81



the area is very very remote no any singel AP no microwave links
i faced this problem with 2 diffrent mikrotik APs
any one have any idea about whats going on???

2

u.fl connector is port-a, not port-b.
Change it on winbox and try again.
I have a RB112 with a SR2, MMCX connector (port-b), 12m Aircom Plus coaxial cable, 1 x 12dBi omni antenna.
11 client (5 laptop and 6 Linksys WRT54G) from 60m to 3000m, ping every under 8/9ms, good bandwidth.

3

Unless there is a new revision of SR2 i haven’t seen, then the U.Fl connector on the SR2 is ant-a setting in RouterOS

4

sorry guys i mean mmcx connector but i type u.fl by mistake


guys do you think the antenna problem??

and whats the problem with the channels except 1 and 11??

5

Have you tryed to change the pigtail?
Have you check the coax between the pigtail and the antenna?

6

if you are so close the pinging less than 20 ms


dont u think its from antenna??

throw WDS interface 5 km from the access point its stable but directly from laptop its not good @ all

7

hello,


i change the antenna but nothing happend,

any suggestion for me to ues the u.fl connector is it better than mmcx??


i will die guys from this

any suggestion or votes to change the radio??


good signal = bad pinging 700-900 ms :frowning: :frowning: :frowning:

8

If you have good signal on ap and client, i don’t think it’s a card fault.
Are you SURE you have no interference on your site?

9

taloot -
I have had the same thing happen - change out your SR2 card… the multiplex switch has gone bad on the card…


Thom

10

for more info guys

the card was operating on the wrong antenna port for 3 weeks (sure it wasnt working but we was having another card in the box) is that could damag the card

11

taloot -
If he was operating on the wrong antenna port for three weeks it is quite possible that the card is permantly damaged. The fact there was another card in the box has no bearing on damaging the card.

The SR cards are pretty robust but nothing can take abuse forever without failing.

As I said in my first post - I have seen this before - the multiplex switch on the SR2 card has probably gone bad for whatever reason. Change the card, make sure the right antenna port gets selected and try it from there.


Thom

12

quote

13

ok thanks guys alot i will order the xr2 just to see the diffrence and let you updated guys

14

hello guys,

i change the SR2 and cables RB pigtail antenna POE
but

still the same any votes for the outdoor case?? for the grounding will help soo much

when i install the ap in the room and leep pingping it i got stable results but in OUD enviroment i good very very bad performance

i need your help guys please please

15

What type of coverage are you looking at? … 15dbi is alot of gain for an omni. you’d probably be better off using a 8 or 9 dbi instead, as the signal radiation wont spur off into the horizon as much.

16

You mentioned earlier or at least that is what I understood a remote WDS link was working OK but not on your laptop …

  • How close to the antenna is the laptop?

  • Whats the elevation AGL where the omni is located?

I am trying to see if you are under the blind area of the radiation pattern of the antenna.

Best

Jorge

17

the antenna is about 23 meter than the ground the area is totally flat

i can connect to the ap directly from the laptop for 9km away from the ap (which is very strong)


also i have MT to MT connection omni to omni over 13km link the signal is -78/-76 also there is problems with the pinging i got a lot of timeout

i tried 11b and 11g both of them have same problem but mybe the 11g is 20% better

even if i m 10 meter away from the omni i m getting same timeout as i m in 9km

do you think i should isolate the antenna and the AP from the tower?

Grounding is it will help??

i testing the ap in the lap the pinging was 1ms more than 300 pings not 2 ms its only 1ms

18

Taloot,

I have had the same issue.. Wild pings up to 1 sec. Also running SR2’s.. I tried everything, all channels etc, changed radio, pigtales etc… What worked for me was killing the WDS link on the omni and made a seperate radio/antenna for the wds part. After that i have no problems on that AP… You can use a R52 and a yagi or something and it will cost you less than $100 to fix it this way.. Just keep the channels apart.

This problem is only seen on SR2’s here. WDS AP’s have been everything from Linksys to MT…

Hope this will solve your problems..

Regards

/Henrik

19

[quote=“taloot”]the antenna is about 23 meter than the ground the area is totally flat

i can connect to the ap directly from the laptop for 9km away from the ap (which is very strong)]

Please read and understand the radiation pattern of your omi.- Omnis does not radiate in an “sphere” like pattern they do it more like a “donut” pattern, so if you are close to the omni you will be below it´s radiation pattern so you will have poor conectivity. Omni´s have a NARROW vertical (E-Plane) pattern and a horizontal pattern of a circle.

Please check http://www.hyperlinktech.com/web/pdf/hg2415u_pro.pdf

AND

http://www.firstmilewireless.com/prod_ant2ov15-dt.html

AND

http://69.93.195.178/~electr0/rfcalculations.html

Omnidirectional Antenna Beamwidth Analysis
Vertical 3 dB beamwidth : 3.500 degrees
Antenna height : 23.000 meters (75.459 feet)
Distance to the 3 dB lobe intersect point : 752.796 meters (2469.803 feet)

Hope this help…

Best Regards

Jorge Boardman
Calculated on Sat Mar 31 18:05:23 2007 GMT

20

hello guys the wds disabled but nothing happend not better not worest

any very very very expert guys have same case and he resolve it


the area is one of the most solti areas in the world it has full lakes of sult is this have anything to do ?


buti tried diffrent access points and it works gr8 and stable whyyy mikrotik have problems???