Agreed. The overall cost is not that high compared to the time
lost picking at it.
I'd rather test and troubleshoot at the bench.
- Jerry
*From:*[email protected]
<mailto:[email protected]>
[mailto:[email protected]] *On Behalf Of *Josh Luthman
*Sent:* Monday, February 14, 2011 10:14 AM
*To:* WISPA General List
*Subject:* Re: [WISPA] Strange RF disconnect problem
If it were me, I would check that LMR and all that other
garbage. Use the ARC 23dbi panel/enclosures. You'll lose 10dbi
(less because of LMR400, connectors, pigtails, N connectors) but
you'll have less to worry about when ice gets on the antenna (IME
last week - none).
Everything is enclosed and pretty and the mounting is easier then
the grids and those stupid U bolts.
Every time I've tried to swap a radio, or a board, or an antenna,
or lmr400...it was a waste of time and money. Scrap the entire
thing and do everything in one clean swoop.
Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
Suite 1337
Troy, OH 45373
On Mon, Feb 14, 2011 at 1:10 PM, Data Technology <[email protected]
<mailto:[email protected]>> wrote:
After posting I recalculated what the signal strength should be
and it
turns out to be mid 50's.
So I guess there is defiantly wrong in the rf system some where.
On 2/14/2011 12:00 PM, Data Technology wrote:
> Sorry for the long post but I need some suggestions here guys.
>
> Customer has a 7.3 mile 5ghz link.
> MT 433AH on one end and MT 411AH on the other.
> Version 4.16 on both units.
> Both units have MT R52Hn cards.
> 28 db grids on both ends with 6-10ft lmr400 jumper.
>
> Signal strength is -65 to -65 on one end and -66 to -67 on the
other.
> CCQ is 98 to 100%
>
> Configured as bridge wds on one end and station wds on the other.
>
>
> This customer is a school and when they came back from
Christmas break
> the link was down.
> This is in a rural area and no other 5 ghz systems show up in a
scan so
> it is a 50/50 shot at the one that is bad.
> We changed the card in one unit and that was not it so we
changed the
> card in the other unit and the link came back up.
> It was not working 100% and would go down and up but the signal
looked
> ok. It was at -70 at the time.
> The only way I could get it to stay up was to change to a 5meg
bandwidth.
>
> The link finally stabilized with the 5 meg channel.
> This would have to do until we could go back and check cables and
> connections.
>
> Well it has worked ok for the most part since then but we have
noticed
> that when it rains
> the link starts dropping out again even though the signal stays
good
> when it is connected.
>
> Sounds like water in a connection so I went yesterday to check some
> connections and they look good.
> Had electrical tape, mastic, and electrical tape. I actually
cut open
> one just to inspect and was dry.
> I know it only takes one connection to cause a problem but visual
> inspection of all connections looked ok.
> Next trip we will have new cables and new antenna.
>
> After I finished messing around with the first unit the link
started
> going down and up.
> The strange thing about this is that when it is up the signal
is a solid.
> About every 60 seconds the link would drop out and come right
back up.
> It did this for about an hour and finally stabilized. Sounds like
> interference.
>
> Here are a few lines from both logfiles.
>
> 05:28:53 wireless,info 00:0C:42:62:E4:82@wlan1: disconnected,
extensive
> data loss
> 05:29:00 wireless,info 00:0C:42:62:E4:82@wlan1: connected,
wants WDS
> 05:30:01 wireless,info 00:0C:42:62:E4:82@wlan1: disconnected,
extensive
> data loss
> 05:30:10 wireless,info 00:0C:42:62:E4:82@wlan1: connected,
wants WDS
> 05:31:10 wireless,info 00:0C:42:62:E4:82@wlan1: disconnected,
extensive
> data loss
> 05:31:19 wireless,info 00:0C:42:62:E4:82@wlan1: connected,
wants WDS
> 05:32:20 wireless,info 00:0C:42:62:E4:82@wlan1: disconnected,
extensive
> data loss
> 05:32:28 wireless,info 00:0C:42:62:E4:82@wlan1: connected,
wants WDS
> 05:33:29 wireless,info 00:0C:42:62:E4:82@wlan1: disconnected,
extensive
> data loss
> 05:33:37 wireless,info 00:0C:42:62:E4:82@wlan1: connected,
wants WDS
>
>
> feb/13 16:14:51 wireless,info 00:0C:42:62:E0:A6@wlan1: lost
connection,
> not polled for too long
> feb/13 16:14:58 wireless,info 00:0C:42:62:E0:A6@wlan1 established
> connection on 5200, SSID Hillview
> feb/13 16:16:01 wireless,info 00:0C:42:62:E0:A6@wlan1: lost
connection,
> not polled for too long
> feb/13 16:16:08 wireless,info 00:0C:42:62:E0:A6@wlan1 established
> connection on 5200, SSID Hillview
> feb/13 16:17:10 wireless,info 00:0C:42:62:E0:A6@wlan1: lost
connection,
> not polled for too long
> feb/13 16:17:17 wireless,info 00:0C:42:62:E0:A6@wlan1 established
> connection on 5200, SSID Hillview
> feb/13 16:18:19 wireless,info 00:0C:42:62:E0:A6@wlan1: lost
connection,
> not polled for too long
> feb/13 16:18:26 wireless,info 00:0C:42:62:E0:A6@wlan1 established
> connection on 5200, SSID Hillview
> feb/13 16:19:28 wireless,info 00:0C:42:62:E0:A6@wlan1: lost
connection,
> not polled for too long
> feb/13 16:19:35 wireless,info 00:0C:42:62:E0:A6@wlan1 established
> connection on 5200, SSID Hillview
>
>
> My Conclustions are possibly 2 problems.
>
> 1. Water somewhere ?
> I will have to check each connection and or replace
jumper cable
> and possibly antenna.
> Has anyone seen the grid element go bad and leak?
>
> 2. Interference ?
> Maybe need spectrum analyzer to check things out.
> What is the timing of a radar signal sweep?
>
> Also, one tower has a lot of slack in the guy wires and it was
moving a
> lot more than I liked in the wind yesterday.
> I think that might be a problem but I don't think it would
cause it to
> drop every 60 seconds.
>
>
> If you made it this far, thank for reading.
>
> LaRoy McCann
> Data Technology
> Trumann, AR
>
>
>
>
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