Mac,
Pretty much the only thing I have seen, is MT not acknowledging the issue
exists publically.
The issue was resolved and changes to the MB were immediate.
Do you know where I can find proof of this?
If I could have found such info, I could have attributed it to my older rev
board, and I could have kept this topic offlist, and spared MT the bad rap.
But I can tell you, it was not good for my reputation when Nextel came
knocking on my door with a Spectrum Analyzer in hand.
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.
Exactly why I was concerned... that was the word on the street regarding the
old problem. However, my problem on 899Mhz was clear.
That could infer that maybe I have a newer rev board that had the 149M
problem fixed and created a new one at 899M?
resolved by changing to 18Vdc POE.
In our case, we initially had the MT 48V POE, then we moved jumper, and
tried a 18V w/ Halfmoon POE, and then tried with Pacwireless integrated 18V
POE.
The lowest emmissions were when using the 18V PacWireless, but the
interference was still significant at 899M in all situations.
Is there a Rev number on the boards that indicate which boards are FIXED
versus not fixed boards?
How can I guarantee that I procure a "fixed" board, apposed to distribution
old stock? Are all the 400Mhz boards fixed?
It would be good news, if this could be resolved with just a MB replacement.
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
----- Original Message -----
From: "Mac Dearman" <[EMAIL PROTECTED]>
To: "'WISPA General List'" <wireless@wispa.org>
Sent: Wednesday, October 24, 2007 2:18 PM
Subject: RE: [WISPA] RB532 Harmful Noise at 899 also
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
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