Does anyone know where I can buy a cost effective 5.3Ghz Full band pass
filter?
Further Food for thought:
One of the biggest differences that we have noticed, using OEM gear (MB's
with mpci Radios), compared to our first generation Trango network, is how
much more interference we get at APs.
I believe this is because Trango had quality filter designs embedded into
their solutions, allthough I'm not an electrical engineer to confirm that.
With the OEM gear, I frequently get a good 20db lower signal strength at an
AP than I do from the CPE side. (with same gain antennas and same TX power
levels) We usually go through the motions of swapping Cards, PS, and MBs as
well as fine alignments, to double check. This had also been seen more
frequently where we had tried Omni installs, and more susceptable to
interference. Sometimes we could solve it with narrower beam antennas, but
in many cases that was just not good enough. In most cases we where easilly
able to find and use external 2.4G and 900Mhz Filters, which would
immediately gain us a good 15db or so, and solve the link problems. So two
thumbs up for external filters. Truthfully, in the last two months we've
needed more filters, than the within the complete last 7 years we've been in
this industry. I attribute this to our larger use of 4 port OEM systems. In
today's case, we had 5.8Ghz interference that we thought was self
interference from our large number of adjacent sectors, so decided to try
5.3Ghz. We used a Trango built-in spectrum scanner to confirm there was no
noise at 5.3Ghz. However, when using an OEM 5.3Ghz radio w/ external AP
20deg panel antenna, we had a 20db loss of signal on the AP side, making the
link unusable (-64 at CPE,.-85 at AP). We believe its out-of-band
interference or over powering from the near by colocated high power paging
antennas at the same horizontal plane. This brought to my attention that we
did not have a solution for a "5.3Ghz bandpass filter". And it is needed.
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
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