Tom, I have had some issues in the 149/151MHz range at 48Vdc and have had a spectrum analyzer sniffing the board and the POE to check for other "out of band" emissions and have never seen an instance with MT at that high of a frequency. The problems were on the older RB532 and it is well documented on how to fix the problem. 99% of the noise that we saw was actually being transmitted at the POE (transferred via cat5?) at the base of the tower and it was resolved by changing to 18Vdc POE. It was bad enough that we shut down two Sheriffs Depts. Base stations and a HAM operator - - each on their own towers where we were co-located. (ouch)
The issue was resolved and changes to the MB were immediate. Mac > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of Tom DeReggi > Sent: Wednesday, October 24, 2007 2:34 AM > To: WISPA General List > Subject: [WISPA] RB532 Harmful Noise at 899 also > > In the past several have mentioned the RB532that spews harmful noise > (out of > band, I think around 400mhz?) when 48volt PS was used. > Just had an insodent today, (with a test unit that was installed in the > field still). It was spewing out interference at 899Mhz noise > interfering > with Nextel. > Confirmed with Spectrum Analyzer it was comming from mainboard. The > noise > was present even when the 5.8Ghz mpci card was disabled. Switching to > 18V > helped a little, but it was still causing significant interference. > This > RBunit is about 1.5 years. Just giving a heads up, for other MT users. > > Does anyone know if this problem was fixed on any of the other newer > models? > > Tom DeReggi > RapidDSL & Wireless, Inc > IntAirNet- Fixed Wireless Broadband > > ----------------------------------------------------------------------- > --------- > > ** Join us at the WISPA Reception at 6:30 PM on October the 16th 2007 > at ISPCON ** > ** ISPCON Fall 2007 - October 16-18 - San Jose, CA www.ispcon.com ** > ** THE INTERNET INDUSTRY EVENT ** > ** FREE Exhibits and Events Pass available until August 31 ** > ** Use Customer Code WSEMF7 when you register online at > http://www.ispcon.com/register.php ** > > ----------------------------------------------------------------------- > --------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > ----------------------------------------------------------------------- > --------- > > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ -------------------------------------------------------------------------------- ** Join us at the WISPA Reception at 6:30 PM on October the 16th 2007 at ISPCON ** ** ISPCON Fall 2007 - October 16-18 - San Jose, CA www.ispcon.com ** ** THE INTERNET INDUSTRY EVENT ** ** FREE Exhibits and Events Pass available until August 31 ** ** Use Customer Code WSEMF7 when you register online at http://www.ispcon.com/register.php ** -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
