[WISPA] 10MHz, 5MHz ch save the day - was - Frustrating connectivity issues.

Thu Nov 5 08:04:47 CST 2009

I have been putting up a few horizontal sectors with 10 MHz channels 
too.  That 3 dB increase in signal to noise has made a world of difference.

I even put one up high, running a 5 MHz channel, and call it my 
"trouble sector."  I have a handful of customers I used knife edge 
diffraction as a propagation medium from day one.  It works 95% of 
the time at 20 MHz channels, with fades to -83 -84 dBm.  This time of 
year is the 5% they begin to fade.  My theory is that as the crops 
dry (corn, beans) they are no longer lined up in neat little rows but 
become more randomized and change the dynamics of the signal.

I moved 3 of them to my "trouble sector" and they are working 
great;   I know from experience this is the bottom of the barrel, and 
they will get steadily better as leaves drop and crops are 
combined.  I'm also convinced horizontal polarization works better 
with knife edge diffraction than vertical.

My trouble sector is even on a fully deployed tower with 3) 120 
degree sectors at 2.4, all vertical.  Trouble sector is 20 feet below 
the main ones, horizontal, using a subset of the same channel of the 
one directly behind it.  That 5 MHz sector gives me a 6 dB increase in s/n.

Steve, how did you change all the customers over to 10 MHz?  I guess 
I could do that in the middle of the night and open a bunch of 
windows and change them, then begin saving one after the other.  Let 
us know your trick.

Just adds to my belief that this wireless stuff is 80% engineering, 
15% black magic, and since I don't believe in luck, 5% good fortune or Karma.

Mike

At 07:03 AM 11/5/2009, you wrote:
>Mark I have seen this exact same thing.  But I bet if you take the 
>radio down the road 1/2 mile it will go away and never cause a 
>problem.  When I had the same issue I ended up putting a Mikrotik 
>client in place with the same XR2 board and firmware as the 
>tower.  That way I had the ability to do Mtik to Mtik testing and it 
>came down to a multipath or RF issue.  I went from hearing from the 
>customer every 4 days to ever month.  Then 2 months ago I switched 
>that sector to 10Mhz G and have not heard a word from that customer 
>since.  I like no phone calls.  10mhz channels have been saving my life.
>
>Steve Barnes
>Manager
>PCS-WIN
>RC-WiFi Wireless Internet Service
>
>Character cannot be developed in ease and quiet. Only through 
>experience of trial and suffering can the soul be strengthened, 
>vision cleared, ambition inspired, and success achieved.
>- Helen Keller
>
>
>-----Original Message-----
>From: wireless-bounces at wispa.org [mailto:wireless-bounces at wispa.org] 
>On Behalf Of Mark McElvy
>Sent: Wednesday, November 04, 2009 8:23 PM
>To: WISPA General List
>Subject: Re: [WISPA] [Mikrotik] Frustrating connectivity issues.
>
>CPQ in router mode and doing the PPPoE, no router behind CPQ.
>
>Mark McElvy
>
>
>-----Original Message-----
>From: wireless-bounces at wispa.org [mailto:wireless-bounces at wispa.org] On
>Behalf Of Eric Rogers
>Sent: Wednesday, November 04, 2009 6:02 PM
>To: WISPA General List
>Subject: Re: [WISPA] [Mikrotik] Frustrating connectivity issues.
>
>Further, are you using a router (Linksys/D-Link/Netgear/Other) with
>PPPoE, or the computer with PPPoE, or even DHCP?
>
>Eric
>
>
>-----Original Message-----
>From: wireless-bounces at wispa.org [mailto:wireless-bounces at wispa.org] On
>Behalf Of Josh Luthman
>Sent: Wednesday, November 04, 2009 6:33 PM
>To: Mikrotik discussions
>Cc: WISPA General List
>Subject: Re: [WISPA] [Mikrotik] Frustrating connectivity issues.
>
> >The whole time the RDP session will stay connected and functional.
>
>Are you sure it's functional?  I expect it probably isn't usable while
>the
>pings stop just like browsing isn't capable.
>
>What are you pinging from/to?
>
>Do you have the Tranzeo fix applied to your CPEs as you're using a
>Mikrotik
>AP?  Is the Tranzeo rebooting per their interpretation of the RFC?  Is
>the
>wireless registration staying up according to the AP?
>
>Josh Luthman
>Office: 937-552-2340
>Direct: 937-552-2343
>1100 Wayne St
>Suite 1337
>Troy, OH 45373
>
>"When you have eliminated the impossible, that which remains, however
>improbable, must be the truth."
>--- Sir Arthur Conan Doyle
>
>
>On Wed, Nov 4, 2009 at 6:27 PM, Mark McElvy <MMcElvy at accubak.com> wrote:
>
> > Recently I posted an issue with a new customer that had a great signal
> > but poor throughput. A lot of people sais multipath. Well now I have
> > more data and another customer seeing the same thing.
> >
> >
> >
> > 1.       If you get connected to an RDP session it stays connected.
> >
> > 2.       If you do a constant ping, you get responses for a while, you
> > won't get responses for a while.
> >
> > 3.       While the pings respond, you can web browse fast.
> >
> > 4.       While the pings don't respond, you get page cannot be
> > displayed.
> >
> > 5.       The whole time the RDP session will stay connected and
> > functional.
> >
> > 6.       Customer says the online game they play will take several
> > attempts to connect but once connected it works great.
> >
> >
> >
> > Someone else suggested power but tried different power supplies with
> > same result. These are Tranzeo CPQ's as clients and MT
>AP/RB532/XR-2/120
> > 16db HPol.
> >
> >
> >
> >
> >
> >
> >
> > Mark McElvy
> > AccuBak Data Systems, Inc.
> >
> >
> >
> >
> >
> > -------------- next part --------------
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> > Mikrotik at mail.butchevans.com
> > http://www.butchevans.com/mailman/listinfo/mikrotik
> >
> > Visit http://blog.butchevans.com/ for tutorials related to Mikrotik
> > RouterOS
> >
>
>
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