Conduit is a terrible way to ground anything. I remember many years ago
fighting a problem for over a year. System ran great in the summer, not
worth a nickel in the winter. Finally determine a voltage difference
between 2 units sitting 5 feet from each other. Had an electrician do
some investigation. The 120V circuit was 2 wire, using the conduit as
ground. Well, it was in the summer when there was enough humidity to
get a good connection. Not so in the dryness of winter. We put a
ground rod just outside the building and the system ran great for years.
So...
Run a wire (large guage if possible) up the inside of that conduit.
When you get to the top, measure the voltage between the wire and the
box with a DVM that can do millivolts. I am guessing you will get a
reading and it won't be stable. Bond that wire to the equipment in the
box and wave goodbye to at least some of your problems.
You may think this crazy, but if the above helps, but doesn't solve
everything, isolate the box from the tower. Yes, isolate them. Make
the wire do all the work. Even with the wire, you can get ground loop
currents.
Marlon K. Schafer (509) 982-2181 wrote:
we're in a metal conduit that we're in, it ties my box at the bottom
of the tower to the box on the top. I've looked at voltage and
grounding issues as closely as I can. My thought has always been a
grounding issue too.
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: "Blake Bowers" <[EMAIL PROTECTED]>
To: "WISPA General List" <[email protected]>
Sent: Monday, February 12, 2007 9:59 AM
Subject: Re: [WISPA] Need an all temp ap with very small size
Check to see if you have "stray" voltage from a good ground to the
water tower itself.
It is actually a very common thing - and can cause equipment to do
very very strange things.
----- Original Message ----- From: "Marlon K. Schafer (509) 982-2181"
<[EMAIL PROTECTED]>
To: <[email protected]>
Cc: <[email protected]>
Sent: Monday, February 12, 2007 11:53 AM
Subject: [WISPA] Need an all temp ap with very small size
Hi All,
I have a water tower that's kicking my tail. I've been through a
slug of sb and inscape and compex ap's. Everything works for a
little while then either outright dies or starts flaking out.
Power seems to be fine, and there are NO pumps at this local. I've
got grounding and lightning protection out the wazzoo.
I need to try a different ap. There's not much room in the box up
top though. I'll need a really small device. It needs to be able
to handle at least 120* to -30* f.
I was thinking of Cisco or Lucent. Any bright ideas?
Don't say MT or StarOS. I want a certified device...... No home
brew up there.
thanks,
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
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Scott Reed
Owner
NewWays
Wireless Networking
Network Design, Installation and Administration
www.nwwnet.net
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