> Do you find this true for Trango 900 also? Yes. Definately. If a SU915/900 Trango can't survive your noise level, nothing else would do it better, period. Trangos have built in circuitry to dynamically compress out noise, which most other brands do not. This has sometimes shown to be as effective (if not more) than add-on higher dollar cavity filters. And Polling w/ARQ feature, made all the difference, in keeping customers over time. Thats before we consider the only 5-6db signal-to-noise required of DSSS.
I'm not saying Trango is the only game in town capable, considering all factors one is looking for. But combating others' noise, is what it does better. I'll add that part of the benefit of the Trango is its abilty to get that resilience to noise, at the lowest dollar amount, for more cases, than equivellent class gear. Meaning its default stock configuration accomplishes alot without add-ons, reducing cost. (no need for expensive Horiz antennas, Lossy COAX, or Cavity filters most of the time) With that said... That doesn't mean that the stock product is enough for all cases. Sometimes add-on Filters for specific case interference helps, or AP anrtennas with better Front to Back ratio for taller tower deployments, and Yagis for CPEs to narrow the beam width. With 900Mhz we get more CPE to adjacent sector/channel CPE interference, than 5.x bands, because of 900Mhz's properties to apss through objects, reducing effectiveness of Front to back ratios. We did some studies awhile back, comparing OFDM to DSSS in 900Mhz. We conclused that the OFDM properties typically allowing better handlign of multi-path to increase signal quality, had next to no improvement in foliage environments. Pol Diversity actually had a higher possitive impact, than OFDM did. But none of them helped gain RSSI more than the disadvantage of the increased Signal to Noise requirement. OFDM 900 is a preferred choice in low noise environments, where the additional speed is needed. Trango has a new MM OFDM 900Mhz series comming out soon. It looks like a promising radio by design. However, I can not comment on it yet, as I have not used it yet. It likely won't do as good in noise as the older DSSS versions. Tom DeReggi RapidDSL & Wireless, Inc IntAirNet- Fixed Wireless Broadband ----- Original Message ----- From: "John Valenti" <[EMAIL PROTECTED]> To: "WISPA General List" <wireless@wispa.org> Sent: Friday, June 13, 2008 10:54 PM Subject: Re: [WISPA] good multiradio wifi units for noise environments? > Tom, > > Do you find this true for Trango 900 also? > > I've not had good luck with those. Mine seem to quit working with the > first competition. > > I do like them for scanning for noise; and the software switchable > horizontal / vertical is nice. > > > On June 13, at 5:59 PM June 13, Tom DeReggi wrote: > >> I personally chose trango for my high noise environments, because >> of its >> unique abilty to avoid interference, with real time flexibility of >> polarities, and DSSS noise resilience. And also its ability to >> accurately >> scan for interference/noise. > > > > -------------------------------------------------------------------------------- > 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/ -------------------------------------------------------------------------------- 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/
