Re: [Tech Ops] 900 mhz Floor Destroyed in Wireless Service Providers http://www.dslreports.com/forum/r20732306 en Wed, 11 Nov 2009 05:24:27 EDT Wed, 11 Nov 2009 05:24:27 EDT Re: [Tech Ops] 900 mhz Floor Destroyed http://www.dslreports.com/forum/remark,20774301 fowlerrudi : "if you go to the Wireless Tab of Winbox. You will see the "Band" drop down box. From here you can select 2ghz g (20Mhz0, 2ghz-10Mhz, and 2ghz-5Mhz."

Thanks a lot. I got it, had to change on both radios, for some reason I thought they'd sync. My spectrum is cleaning up!]]> http://www.dslreports.com/forum/remark,20774301 Fri, 11 Jul 2008 09:53:23 EDT Re: [Tech Ops] 900 mhz Floor Destroyed http://www.dslreports.com/forum/remark,20751255 Gerard780 : Mikrotik only displays 900mhz when using the SR9's.

-Gerard]]> http://www.dslreports.com/forum/remark,20751255 Sun, 06 Jul 2008 23:23:02 EDT Re: [Tech Ops] 900 mhz Floor Destroyed http://www.dslreports.com/forum/remark,20751207 NZFxonet : What OS version are you running? I thought the newest versions displayed 900mhz correctly without the conversions.

Mike]]> http://www.dslreports.com/forum/remark,20751207 Sun, 06 Jul 2008 23:10:13 EDT Re: [Tech Ops] 900 mhz Floor Destroyed http://www.dslreports.com/forum/remark,20745550 mtroup : Under the wireless tab look at "Band:" you should be able to select 2GHz-10MHz or 2GHz-5MHz]]> http://www.dslreports.com/forum/remark,20745550 Sat, 05 Jul 2008 14:01:01 EDT Re: [Tech Ops] 900 mhz Floor Destroyed http://www.dslreports.com/forum/remark,20735639 fowlerrudi : Physical separation won't help because when I sniff from 300 feet away from the tower (on the ground) with a subscriber unit, the noise is still there.]]> http://www.dslreports.com/forum/remark,20735639 Thu, 03 Jul 2008 07:15:07 EDT Re: [Tech Ops] 900 mhz Floor Destroyed http://www.dslreports.com/forum/remark,20733131 LLigetfa :
said by fowlerrudi See Profile :

Aren't narrow bandpass filters expensive?
Yes they are. You could try for greater physical separation and maybe erect some shielding to reduce sidelobes.
--
Strange as it seems, no amount of learning can cure stupidity, and formal education positively fortifies it. -- Stephen Vizinczey]]> http://www.dslreports.com/forum/remark,20733131 Wed, 02 Jul 2008 17:37:37 EDT Re: [Tech Ops] 900 mhz Floor Destroyed http://www.dslreports.com/forum/remark,20732511 viperm : AHhh probably so ]]> http://www.dslreports.com/forum/remark,20732511 Wed, 02 Jul 2008 15:41:02 EDT Re: [Tech Ops] 900 mhz Floor Destroyed http://www.dslreports.com/forum/remark,20732508 fowlerrudi : Mine are showing as 2432mhz, etc. It downconverts to 900mhz I am told.]]> http://www.dslreports.com/forum/remark,20732508 Wed, 02 Jul 2008 15:40:35 EDT Re: [Tech Ops] 900 mhz Floor Destroyed http://www.dslreports.com/forum/remark,20732487 viperm : It should be under the wireless tab in winbox under band it should show you 900 Mhz 5, 10, 15 20 mhz if the radios support it..
--
ComTrain Certified Tower Climber. American Tower Certified approved contractor. Wireless consultants.]]> http://www.dslreports.com/forum/remark,20732487 Wed, 02 Jul 2008 15:37:43 EDT Re: [Tech Ops] 900 mhz Floor Destroyed http://www.dslreports.com/forum/remark,20732433 fowlerrudi : I've got to figure out how to change the channel spacing first, I am new to these radios. The polarization is different from the other radios.]]> http://www.dslreports.com/forum/remark,20732433 Wed, 02 Jul 2008 15:25:36 EDT Re: [Tech Ops] 900 mhz Floor Destroyed http://www.dslreports.com/forum/remark,20732425 dongato17 : Are both of these radios using 20MHz of spectrum? If possible, you can try to change to 2x 10MHz channels and also run on different polarizations. This would give you polarization isolation as well as adjacent channel filtering to separate the links and could be enough to get the job done.

-Hal]]> http://www.dslreports.com/forum/remark,20732425 Wed, 02 Jul 2008 15:24:00 EDT Re: [Tech Ops] 900 mhz Floor Destroyed http://www.dslreports.com/forum/remark,20732378 fowlerrudi : Good point mountain top, I shall try this. Aren't narrow bandpass filters expensive?]]> http://www.dslreports.com/forum/remark,20732378 Wed, 02 Jul 2008 15:16:06 EDT Re: [Tech Ops] 900 mhz Floor Destroyed http://www.dslreports.com/forum/remark,20732306 anon : Reducing the power is supposed to reduce the noise you receive from distant interference. You might reduce your signal but you might reduce your noise even more improving the quality of the link by increasing the SNR (Signal to Noise Ratio).]]> http://www.dslreports.com/forum/remark,20732306 Wed, 02 Jul 2008 15:04:51 EDT Re: [Tech Ops] 900 mhz Floor Destroyed http://www.dslreports.com/forum/remark,20732246 LLigetfa : You could deploy narrow bandpass filters on one or both.]]> http://www.dslreports.com/forum/remark,20732246 Wed, 02 Jul 2008 14:54:09 EDT Re: [Tech Ops] 900 mhz Floor Destroyed http://www.dslreports.com/forum/remark,20732045 fowlerrudi : Not sure, I believe XR9 Mikrotiks. I can reduce power, but then my signal strength will diminish correct?]]> http://www.dslreports.com/forum/remark,20732045 Wed, 02 Jul 2008 14:23:38 EDT Re: [Tech Ops] 900 mhz Floor Destroyed http://www.dslreports.com/forum/remark,20732037 viperm : What radio cards you using? can you reduce power?]]> http://www.dslreports.com/forum/remark,20732037 Wed, 02 Jul 2008 14:22:30 EDT Re: [Tech Ops] 900 mhz Floor Destroyed http://www.dslreports.com/forum/remark,20732000 fowlerrudi : I've tried 5.2GHz, can't do it without LOS though. This is all NLOS.]]> http://www.dslreports.com/forum/remark,20732000 Wed, 02 Jul 2008 14:16:43 EDT Re: [Tech Ops] 900 mhz Floor Destroyed http://www.dslreports.com/forum/remark,20731987 lutful : Even the best antenna designs provide only 20dB of separation between orthogonal polarizations. So if you are flooding an H-pol site with -50dBm level V-pol waves, it will see -70dBm noise floor. :(

Maybe you can use 5Ghz or even 2.4Ghz backhaul? :) ]]> http://www.dslreports.com/forum/remark,20731987 Wed, 02 Jul 2008 14:14:48 EDT [Tech Ops] 900 mhz Floor Destroyed http://www.dslreports.com/forum/remark,20731270 fowlerrudi : Hello, I just put up a Mikrotik 900 mhz backhaul. I am using WaveIP gear (900mhz HVOL w/omni) to service my customers. As soon as I put up my 900 mhz backhaul (VPOL) 12.5dbi panel on the tower and to the other point 2.5kms away, my noise floor, when scanning through the WaveIP gear went through the roof. I've changed the channels (frequency) on the Mikrotik stuff, it improves, but not like as if it isn't there, it is still bad. How can I adjust channel spacing? How can I fix this problem? Thanks!]]> http://www.dslreports.com/forum/remark,20731270 Wed, 02 Jul 2008 12:10:06 EDT