I never put more than 2 radio cards in the same box, and then only if
they are at least 40MHz apart in the 5GHz band.
In the 2.4 GHz band, I simply don't put 2 radios in the same box.
Also, the XR's draw more power than the SR cards. Does your 4 card
adapter have enough headroom on the power side?
Travis Johnson wrote:
Didn't you just "upgrade" to the XR series cards? They put out a lot
more power, thus creating issues inside the box.
You could turn the power way down or even turn 1 or 2 cards off and see
if that fixes the issues.
Travis
Microserv
Mike Hammett wrote:
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
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