Again we have a single Allen Bradley Power supply that supplies 12VDC to 
individual POE inserters. What are others using for this configuration.

Steve Barnes
RCWiFi Wireless Internet Service


-----Original Message-----
From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf 
Of Marlon K. Schafer
Sent: Wednesday, April 29, 2009 11:22 AM
To: WISPA General List
Subject: Re: [WISPA] Noise by me on a tower

I've seen power supplies do things like this in the past.  Get someone on 
the tower to pull one at a time till you figure out which unit is the real 
cause of the trouble.

I'd also ask to see the SA readings, the wave form may be of help if you can 
post a pic of it.

marlon

----- Original Message ----- 
From: "Steve Barnes" <st...@pcswin.com>
To: "WISPA General List" <wireless@wispa.org>
Sent: Wednesday, April 29, 2009 8:01 AM
Subject: [WISPA] Noise by me on a tower


>I have an odd situation, I have 2-2.4 180* sectors MT RB411 and 5-5.8 
>StarOS War1 backhaul radios and a RB600 router at the top of a 265ft old 
>AT&T microwave tower. The top has a grounded NEMA metal box and POE powered 
>by an Allen Bradley converter. I have an AC and an Ethernet run to the base 
>where I have a APC UPS.
>
> The owner just leased space to another client 20 Feet away on same level 
> from me.  It is a local REMC doing meter reading on 221Mhz.  They were 
> having problems with receiving they brought in a spectrum analyzer and 
> there was a noise floor of -71 at 220Mhz.  The tower owner being an radio 
> guy not a wireless guy just killed power on the ups. (taking down all my 
> stuff and locking up 1 one of the radios for an hour GRRR)  When our 
> equipment was off the noise floor went to -108.  As soon as he powered me 
> back up the noise returned.  They actually said that there was noise from 
> around 150Mhz to 240Mhz.
>
> Everything is grounded and cased in metal except the LMR that goes to the 
> Antennas, the AC wire is in flex and the shielded Ethernet down the tower.
>
> Ideas? there might be a little noise off the oscillators of the War-1 
> boards but that's 175Mhz.  The Ethernet is 100Mhz, RB411 300Mhz and RB600 
> 266 MHz
>
> Steve Barnes
> RCWiFi Wireless Internet Service
>
>
>
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