Yup, I ordered the 912. With the 917, the interference on 928 would
have still bothered me.
Brian
Jack Unger wrote:
Ubit has two - one centered on 912 and one centered on 917. Be sure to
order the appropriate one.
Brian Rohrbacher wrote:
I just called for the info, but I need something now and might order
the ubnt one if I get someone to ship it today. So, as long as my
center is 912-917 I'd be fine with the ubnt one? I think that will do.
Brian
Jack Unger wrote:
Brian,
Bandpass filters come in different band "widths". Some are full-band
filters that pass 902-928 MHz and some are single-channel filters
that are narrower and pass only one channel. The bandwidth of the
two Ubiquity filters are a little narrow to use across the entire
band but if you are using 912 or 917 as center frequencies, they
should work well. If you're using a lower center frequency, you'll
need a filter that has a bit wider bandwidth but which still
attenuates the paging frequencies a lot. The availability of good
whole-band bandpass filters seems to have deteriorated a bit in the
last year. There are more filters available but they seem to have
poorer characteristics and sometimes higher prices. I just looked at
RFLinx and Hyperlinktech and I am not happy with their current
offerings. I did discover a notch filter that is tuned to attenuate
the paging frequencies while passing the 902-928 frequencies. I
don't know the pricing but if it's priced reasonably then it looks
like your best bet. Here's the link:
http://www.microwavefilter.com/2ghzRelocation.htm#ism
It's the filter at the bottom of the page. If you call them to get a
spec sheet and to check pricing, please share that info.
Thanks,
jack
Brian Rohrbacher wrote:
Thanks, Jack. Would installing this one
http://www.ubnt.com/cf.php4 be the correct move? Or is something
else preferred.
Brian
Jack Unger wrote:
Brian,
A -36 dBm signal probably won't destroy your receiver or
permanently desensitize it however your best bet is to get
confirmation from a Motorola rep. The signals you see at 928-930
MHz are from one or more paging transmitters. These paging signals
could easily desensitize your AP receivers temporarily and cause a
temporary inability to hear incoming SM signals.
Since you appear to be using antennas that are external to your
APs, you can insert a bandpass filter between each AP and its
antenna. This will attenuate the paging signals and allow the APs
to receive SM's from further away. If the paging transmitters ARE
the cause of your apparent AP receiver sensitivity deterioration,
then the bandpass filters should be helpful in reducing the
frequency of occurance of the problem.
jack
Brian Rohrbacher wrote:
How would that help? One sector is still pointing at the
interference.......Wouldn't that sector still make the radio
fail, if the -36 signal is what is doing it?
My question from the original post. Will that strong signal
desensitize the radio into failure? If not, then I need to
figure out what kills my radios. Why do they work fine for a
month and then die? I replace just the radio and they are fine
for a while.
Brian
Marlon K. Schafer (509) 982-2181 wrote:
If you are that close to a source of interference you need to
ditch the omnis and sectorize our tower.
laters,
Marlon
(509) 982-2181 Equipment sales
(408) 907-6910 (Vonage) Consulting services
42846865 (icq) And I run my
own wisp!
[EMAIL PROTECTED]
www.odessaoffice.com/wireless
www.odessaoffice.com/marlon/cam
----- Original Message ----- From: "Brian Rohrbacher"
<[EMAIL PROTECTED]>
To: "Conversations over a new WISP Trade Organization"
<[email protected]>
Sent: Tuesday, February 20, 2007 7:05 AM
Subject: [WISPA] failing Canopy 900
I keep losing canopy 900 APs. I used the spectrum analyzer
yesterday and saw -36 signal on channels 928, 929, and 930.
Will that strong signal desensitize the radio into failure?
because for some reason SMs that used to be -65 are -80 (on
both sides of the like) and 17 out of 33 associations have
dropped off the AP. I've been fighting this for a year. I've
installed my own grounding, a lighting dissipater, 6 new APs, 2
new omnis, and 3 new cables. I think I have ruled out anything
that could be killing this AP except if something RF is killing
it. Any input will help.
Brian
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