Hi,
I have an RB333 with 2x 2.4Ghz PTP Links. 1 on CH1, the other on CH14.
Both antennas are 19db parabolic dishes, around 60 degree apart.
My problem is, when either of the 2.4Ghz links are under load (around 5 - 6mbit) the other starts to drop packets. I’m assuming this because they are interfering with each other, although on different channels.
What can i do to improve the situation?
Would running them on separate boards help, using different antennas etc?
Thanks.
Greenie.
greenie,
You could be right and it could be an interference issue, if that is the case, I would take a look into a bandpass filter. Hyperlink seems to make some farily good ones, we have used them before with much success. http://www.hyperlinktech.com/productfamily.aspx?id=352
The only problem is that they might not be able to solve your issue due to the interference could be inside the enclosure between the two cards on the RB333. Personally, I’m more likely to lean toward an issue revolving around the two radios together in the single RB333. It could be a power issue, interference or something we haven’t even considered. If you have another RB around, I would try putting it up and moving one of the radios into that RB before I spent money on a bandpass that might not solve the issue. If you still have problems with lost packets when running the radios seperately, it’s safe to say it isn’t internal interference or anything to do with the single board configuration and you have it narrowed down to interference that could be easily solved with a bandpass.
One note, if you end up going the bandpass route, a 4 pole would work in your situation too since you are so many channels apart. Depending if there are any other signals in the area though, the 8 pole might be money well spent. I am betting though that you will find the problems go away by seperating the radios as we have experienced this before on a repeater site we had and the issue was at 5 GHz so there was no chance of overlap. We had one radio at 5.3 and one at 5.8 and they had the same issues, Ubiquiti XR5’s, we didn’t nail down the exact cause but we speculated that either the one radio being TX right next to the other was destroying the sensitivity or that the RB had issues with current draw under heavy tx loads.
Thanks for the reply, i do have a spare board so i will try it and see how i go. It would be a shame if it fixes it, whats the point of having a board with 3 slots if i cant use them 
Let us know please, I also will be putting 2 2.4 cards in the same routerboard.. -Jordan
Never had a problem running 2 SR2’s…
I now have them running on two separate boards, problem appears to have gone away.
The RB333 also has a 5Ghz Radio as well as the 2x 2.4Ghz Radio’s, would it help if the 5Ghz card was between the two 2.4Ghz cards?
What else would cause this issue?
Thanks.
I’m still experiencing this issue on a couple of my links.
The wireless cards that appear to be interfering with each other on the same board are Senao NMP-8602.
After doing some research, people say the Senao cards are rubbish, has anyone else seen this kind of issue with the Senao NMP-8602?
Thanks.