Diddy1
join:2003-07-19
Sidney, NE
| Ducting in micro-wave?
Has anyone encountered ducting of micro-wave frequencies? I have a client that will not stay linked on 2.4Ghz for nothing. Tried several different radio devices, of multiple manufacturers. However the neighboor, also on our same network, has little to no issues at all and is about 100' away from the problem CPE. Hidden node should not be a problem between these two clients as they are on different APs, but same spectrum? I cannot, however, connect the "problem" client to the same AP the "non-problem" client is connected to. Thoughts?
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if you fail to plan, you plan to fail |
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GNca George
GorillaNET
Premium
join:2008-07-12
Minden, ON
| Yes, we get serious problems with 5 gig at this time of year and also in the fall. Only on north/south links of more than 25 miles though. 45dB swings at times, worst around dawn!!
I've never seen it on 2.4 but that doesn't mean it can't happen. |
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smeghead
join:2009-02-11
| reply to Diddy1
I know when we are going to have problems when I drive 1hr into work.
Usually my radio station starts to fade at certain areas but some days it will fade way early or way late. You can tell what sort of atmospheric bouncing we are getting.. I guess you call it tropospheric ducting..
»www.dxinfocentre.com/tropo.html |
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AMD Phreak
Premium
join:2003-12-14 | reply to Diddy1
Interesting.
Have you tried changing the antenna elevation on the one in question? How clear is the path? |
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Inssomniak
Premium
join:2005-04-06
Cayuga, ON
| reply to Diddy1
said by Diddy1  :Has anyone encountered ducting of micro-wave frequencies? I have a client that will not stay linked on 2.4Ghz for nothing. Tried several different radio devices, of multiple manufacturers. However the neighboor, also on our same network, has little to no issues at all and is about 100' away from the problem CPE. Hidden node should not be a problem between these two clients as they are on different APs, but same spectrum? I cannot, however, connect the "problem" client to the same AP the "non-problem" client is connected to. Thoughts? I have 3 customers that were on 2.4ghz, they register with good signals, but dont work, at all. Only a few small packets pass. Yet across the street it works fine. Nothing shows up on a spectrum scan.
Had to move them all to 5ghz. |
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AMD Phreak
Premium
join:2003-12-14 | reply to Diddy1
Any resolution?
I suspect the issue is not ducting. |
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superdog
I Need A Drink
Premium,MVM
join:2001-07-13
Lebanon, PA
| said by AMD Phreak :Any resolution? I suspect the issue is not ducting. Agreed. From what I have read, They only way ducting affects your clients is when another source or frequency is carried into your area that normally isn't there, and that source is interfering with your radios on the same channel etc.
Again, From what I have read, ducting usually occurs during periods of heavy air pressure, humidity and temperature swings and is worse in areas with large amounts of water. On average, These situations also only happen in the early AM and late PM and do not continue to happen on an all day basis. Since you mentioned that you have tried many different types of radio OEM's, I can only assume (I hate that word, LOL) that you have tried to connect this client during different times of the day on several different days and this was not a deal where you tried 10 radios all in a row within a 1 hour period?
In the past, I have also ran into situations where no matter what I did, or how I did it, the client radio refused to work, even though another customer less than say 200ft away was connected and working perfectly? I have no idea why this "Black Hole" thing exists, but obviously it does, as it has happened to more than 1 of us here.
Have you tried to switch the polarity of the CPE? I once had a customer who would not connect to the tower on H polarity with anything usable (The AP was using an H polarity sector), but when I switched the CPE to vertical, it began to pass packets and function. By doing this, I could actually get a stable enough link to keep the customer online.
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»www.wavecrazy.net
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AMD Phreak
Premium
join:2003-12-14
| superdog you are catching on 
I would like to add to the post an idea. I had the prem tech out on a trbl earlier this week where the cust was having odd signal issues. Jitter was all spiked and then it was not, rsl was good. I had the tech try moving up the roof ten feet (cpe was at gutter level, he said the tower was completely visible) and still nothing. For grins i had him set up on the lawn. Wouldnt you know, everything got better! I am thinking it is either odd/even fresnel issues or some type of off-axis interference from an adjacent wisp. I had him change the mount location to along the side of the prem and we are golden.
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"No job is so important, and no service is so urgent that we cannot take the time to perform our work safely."
-- AT&T, Your World, Destroyed.
--Safety One Tower Rescue Certified
--LLigetfa:"Wimax is like teenage sex. Everyone talks about doing it." |
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