The noise is coming from the actual wireless cards being so close to each other. Not all of the signal is going out the cable... and with cards stacked within inches from each other, more noise bleeds over.
Travis Microserv Mike Hammett wrote: > So are you telling me that I can only run 2 or 3 radios in upper 5 GHz > without stepping on myself? > > I was pretty sure nothing was greater than -60 or so before I made these > tower changes, but silly me, I didn't bother to document what I saw. > > Some of those signals don't make any sense, either. Between North and East > and North and South are gigantic chunks of metal to where I doubt you could > even physically see a foot or two to the side of either sector. > > > ---------- > Mike Hammett > Intelligent Computing Solutions > http://www.ics-il.com > > > > > From: Travis Johnson > Sent: Wednesday, October 01, 2008 11:21 AM > To: WISPA General List > Subject: Re: [WISPA] Bad radio? > > > This really looks like you are causing yourself all kinds of interference. > Using the channels you listed: > > > North, ICS1 = 5785 > South, ICS2 = 5805 > East, ICS4 = 5765 > West, ICS3 = 5745 > I'm sure they are stepping on each other. The signal doesn't just drop > completely off on the edges. I assume 20mhz wide channels (because you didn't > specify), meaning North and South edges are right next to each other, but in > the same case, on the same card, I'm sure you are stepping on yourself. Same > with the East and West ones. > > So, on the North you are actually using 5775 to 5795. While on the South you > are 5795 to 5815. I can tell you right now that even having 10mhz between > channel edges isn't going to be enough... you will need 20-40mhz of spacing > between the edges of the band to keep from interfering with yourself. > > Travis > Microserv > > Mike Hammett wrote: > The TX is currently set to default in MT 2.9.51, whatever dB that turns out > to be. I was going to tune it once the system stabilized. > > Maybe 20' of LMR-400. > > No lightning arrestors. The other sectors on the tower sat there for years > without them and no damage, so when I upgraded and had the wrong pigtails to > use the existing arrestors, I removed them. > > No amps, just the XR5s... I'd never use an amp. > > Roughly 16 dBi gain for all 4 sectors pointed North, South, East, and West. > They all have roughly 5 degrees of downtilt. > > No PoE, the MT system is a PC with a 4 slot mPCI adapter. The only other > cat 5 is going to an Orthogon Gemini (and it's PoE). This is pointed east > and is on the opposite side of the grain leg from the troubled sector. > > Nothing else within 1 mile that uses upper 5 GHz. Well, there's CPE in > unknown bands, but they didn't affect the previous radio\antenna combo. > > All customers use 19 or 24 dBi RooTennas, depending on distance from tower. > I believe everyone is between -60 and -75. > > For some reason, some of these sectors are much louder than they were > previously, though I don't have any documentation as to who saw what before. > What do band-pass filters cost and where can I get them? Maybe I ought to > invest in some of those. > > North, ICS1 = 5785 > South, ICS2 = 5805 > East, ICS4 = 5765 > West, ICS3 = 5745 > > North = 1 > ======= > Flags: A - active, B - bss, P - privacy, R - routeros-network, N - nstreme > ADDRESS SSID > BAND FREQ SIG RADIO-NAME > AB R 00:15:6D:50:16:C6 ICS3 > 5ghz 5745 -49 00156D5016C6 > AB R 00:15:6D:50:17:09 ICS4 > 5ghz 5765 -37 00156D501709 > AB R 00:15:6D:64:0B:59 ICS2 > 5ghz 5805 -43 00156D640B59 > AB RN 00:0C:42:05:51:B7 Walter > 5ghz 5260 -71 000C420551B7 > > South = 2 > ======= > Flags: A - active, B - bss, P - privacy, R - routeros-network, N - nstreme > ADDRESS SSID > BAND FREQ SIG RADIO-NAME > AB R 00:15:6D:50:16:C6 ICS3 > 5ghz 5745 -51 00156D5016C6 > AB R 00:15:6D:50:17:09 ICS4 > 5ghz 5765 -38 00156D501709 > AB R 00:15:6D:64:0B:55 ICS1 > 5ghz 5785 -29 00156D640B55 > > East = 4 > ======= > Will run a scan during non-peak times. > > West = 3 > ======= > Will run a scan during non-peak times. > > Mikrotik reports a debatable noise floor reading, which is supposed to > represent all non-802.11 systems. It isn't worse than -99 on any sector. > > > > ---------- > Mike Hammett > Intelligent Computing Solutions > http://www.ics-il.com > > > > -------------------------------------------------- > From: "Marlon K. Schafer" <[EMAIL PROTECTED]> > Sent: Wednesday, October 01, 2008 9:59 AM > To: "WISPA General List" <[email protected]> > Subject: Re: [WISPA] Bad radio? > > First, read this: > http://www.enterprisenetworkingplanet.com/netsysm/article.php/3765946 > > It might sound strange but sometimes RSSI can be effected by interference. > It's important to run the calcs on what you're running. I have a nice > spread sheet if you need a calculator. I really really miss the YDI > online > one. Nice and simple. Not full of junk no one uses. Oh well. > > To offer more realistic help here we need to know a lot more info.... > > What TX power are the radios set for? > > How much coax? > > Lightning arrestors? > > Amps (db)? > > What antenna gain? > > If sectors, what coverage and how are they pointing? (example, customers > are 500' lower than the antenna and 1 to 20 miles away. Antenna is > downtilted 25*) > > How long are the cat 5 runs? > > Any other radio systems on that tower or near by (less than one mile)? > > If you do an ap scan from each AP (usually have to put them in client mode > but some will do so via ap mode) how many other systems do you see and > what > levels do you see them at? > > Do you have the ability to run a general spectrum scan? If so, what does > it > show? (NOTE: If you run this test make sure to run a second test with > all > of the other AP's that you control turned off.) > > I turn the power wayyyyyy down on almost all of my AP's these days. Most > are only putting out 15 to 20 dB. I use slightly larger customer antennas > to make up for the AP TX power losses. This has REALLY helped the speeds > and stability on my overall system. Believe it or not, I have customers > at > nearly 15 miles pulling 2 to 3 megs both ways via an 8 dB omni fed by a > radio turned down to 17dB. > > I now have several customers over 15 miles that pull from 13dB sectors fed > by 17dB ap's. Speeds are HIGHER than they were when I was running amped > systems at 4 watts. > > Happy hunting! > marlon > > ----- Original Message ----- > From: "Mike Hammett" <[EMAIL PROTECTED]> > To: "WISPA General List" <[email protected]> > Sent: Wednesday, October 01, 2008 6:48 AM > Subject: Re: [WISPA] Bad radio? > > > okay, now 3 days later the new south radio (originally north) is > misbehaving > in the same way (Tx/Rx signals are off by 10 where on the other sectors > they're roughly balanced). The signals going back to the tower are 8 - > 10 > db stronger than the received signals. An R52 (or possibly R52H) is > shooting back to the tower whereas an XR5 is shooting down to the CPE. > If > it were different radio specs, it'd be unbalanced the other way around. > > The SR5s that I have installed have been functioning just fine for years > and > are installed in the same fashion as the XR5s. Did UBNT make a bad batch > of > XR5s or am I doing something wrong? > > > ---------- > Mike Hammett > Intelligent Computing Solutions > http://www.ics-il.com > > > > -------------------------------------------------- > From: "Mike Hammett" <[EMAIL PROTECTED]> > Sent: Sunday, September 28, 2008 2:58 PM > To: "WISPA General List" <[email protected]> > Subject: Re: [WISPA] Bad radio? > > I changed the freq a bit and didn't see any significant change. I > climbed > and swapped the pigtails with North and changed all the settings so they > were fully swapped. Everyone on the south sector (which did have the > questionable radio) is now happy. Now the North sector is showing the > same > symptoms on my test CPE. It's a good thing everyone except two are on > East > and West until I get this sorted out. Time to contact Streakwave about > a > bad radio... > > > ---------- > Mike Hammett > Intelligent Computing Solutions > http://www.ics-il.com > > > > -------------------------------------------------- > From: "RickG" <[EMAIL PROTECTED]> > Sent: Sunday, September 28, 2008 1:05 PM > To: "WISPA General List" <[email protected]> > Subject: Re: [WISPA] Bad radio? > > It would be interesting to switch the freqs around and see what > happens. It's probably a bad radio or cable though. -RickG > > On Sun, Sep 28, 2008 at 1:06 PM, Mike Hammett > <[EMAIL PROTECTED]> > wrote: > Does this seem like the radio isn't loud enough? > > I setup the test CPE on the TV tower at my house and pointed it at the > tower. Radio Mobile reports the azimuth as 250 degrees, so well > within > the south sector's coverage and only at a distance of 230'. I am well > below the vertical beamwidth of the sectors, explaining the relatively > low signals, but ICS2 is horrible. > > 1 = North, 2 = South, 3 = West, 4 = East. > > It makes no sense that South is that much worse signal wise than the > others, especially considering that it should be on the South sector > anyway. 3 and 4 are SR5s while 1 and 2 are XR5s. I just replaced the > towers with the XR5s. > > > > [EMAIL PROTECTED] Test Platform] > /interface wireless scan wlan1 > Flags: A - active, B - bss, P - privacy, R - routeros-network, N - > nstreme > ADDRESS SSID BAND > FREQ > SIG NF SNR RADIO-NAME > AB R 00:15:6D:50:16:C6 ICS3 5ghz > 5745 -72 -99 27 00156D5016C6 > AB R 00:15:6D:50:17:09 ICS4 5ghz > 5765 -68 -99 31 00156D501709 > AB R 00:15:6D:64:0B:59 ICS1 5ghz > 5785 -77 -99 22 00156D640B59 > AB R 00:15:6D:64:0B:55 ICS2 5ghz > 5825 -85 -99 14 00156D640B55 > > > Here is a listing of the signals when connected: > > [EMAIL PROTECTED] Test Platform] > /interface wireless monitor wlan1 > status: connected-to-ess > band: 5ghz > frequency: 5785MHz > tx-rate: "6Mbps" > rx-rate: "6Mbps" > ssid: "ICS1" > bssid: 00:15:6D:64:0B:59 > radio-name: "00156D640B59" > signal-strength: -77dBm > tx-signal-strength: -74dBm > noise-floor: -107dBm > signal-to-noise: 30dB > tx-ccq: 58% > p-throughput: 5481 > overall-tx-ccq: 58% > authenticated-clients: 1 > current-ack-timeout: 28 > wds-link: no > nstreme: no > framing-mode: none > routeros-version: "2.9.51" > last-ip: 10.10.1.1 > 802.1x-port-enabled: yes > compression: no > current-tx-powers: > 6Mbps:24(24),9Mbps:24(24),12Mbps:24(24),18Mbps:24(24),24Mbps:24(24),36Mbps:22(22),48Mbps:20(20),54Mbps:19(19) > notify-external-fdb: no > > > [EMAIL PROTECTED] Test Platform] > /interface wireless monitor wlan1 > status: connected-to-ess > band: 5ghz > frequency: 5825MHz > tx-rate: "6Mbps" > rx-rate: "6Mbps" > ssid: "ICS2" > bssid: 00:15:6D:64:0B:55 > radio-name: "00156D640B55" > signal-strength: -86dBm > tx-signal-strength: -76dBm > noise-floor: -107dBm > signal-to-noise: 21dB > tx-ccq: 59% > p-throughput: 5535 > overall-tx-ccq: 58% > authenticated-clients: 1 > current-ack-timeout: 167 > wds-link: no > nstreme: no > framing-mode: none > routeros-version: "2.9.51" > 802.1x-port-enabled: yes > compression: no > current-tx-powers: > 6Mbps:24(24),9Mbps:24(24),12Mbps:24(24),18Mbps:24(24),24Mbps:24(24),36Mbps:22(22),48Mbps:20(20),54Mbps:19(19) > notify-external-fdb: no > -- [Q quit|D dump|C-z pause] > > > [EMAIL PROTECTED] Test Platform] > /interface wireless monitor wlan1 > status: connected-to-ess > band: 5ghz > frequency: 5745MHz > tx-rate: "6Mbps" > rx-rate: "6Mbps" > ssid: "ICS3" > bssid: 00:15:6D:50:16:C6 > radio-name: "00156D5016C6" > signal-strength: -74dBm > tx-signal-strength: -70dBm > noise-floor: -106dBm > signal-to-noise: 32dB > tx-ccq: 59% > p-throughput: 5518 > overall-tx-ccq: 59% > authenticated-clients: 1 > current-ack-timeout: 28 > wds-link: no > nstreme: no > framing-mode: none > routeros-version: "2.9.51" > last-ip: 10.10.3.5 > 802.1x-port-enabled: yes > compression: no > current-tx-powers: > 6Mbps:24(24),9Mbps:24(24),12Mbps:24(24),18Mbps:24(24),24Mbps:24(24),36Mbps:22(22),48Mbps:20(20),54Mbps:19(19) > notify-external-fdb: no > > [EMAIL PROTECTED] Test Platform] > /interface wireless monitor wlan1 > status: connected-to-ess > > -------------------------------------------------------------------------------- > WISPA Wants You! 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