I have a genuine interest to know what's going on here. Why wasn't this an issue before and what effect does this have on a radio no longer transmitting as powerfully? I could see it going deaf, but it hears just fine.
I'm thinking about ditching the PC and mPCI - PCI adapter and going with 4x RB411AHs instead, providing some increased radio separation. Depending on how I do it, there may be sheet metal between each RB411AH as well. ---------- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com -------------------------------------------------- From: "Travis Johnson" <[EMAIL PROTECTED]> Sent: Wednesday, October 01, 2008 12:25 PM To: "WISPA General List" <[email protected]> Subject: Re: [WISPA] Bad radio? > 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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