Tom,
Maybe this is a dumb question, but I assume you are using antennas rated
for 5.3ghz at the AP and CPE side? We have seen some antennas
(PacWireless dishes) that are rated for 5.8ghz work perfectly well at
5.3ghz... but then we have seen other antennas rated for 5.8ghz that
don't work very well at all below 5.700ghz.
Travis
Microserv
Tom DeReggi wrote:
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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** FREE Exhibits and Events Pass available until August 31 **
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