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Home > Archive > alt.certification.cisco > February 2003 > wireless issues
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| Hi all,
We are doing a wireless install for 3bldgs, Aironet 350 root at the main bldg and two 350s non-root at the other 2 bldgs. We have been getting intermittent drops between the omni antenna at the main bldg and two bldgs.
We hooked the base up on the roof directly to the antenna and it work perfectly. We are using cable (rg-58) extensions and is only about 100ft, we think there is some loss going on.
here are some of the stuff that we followed:
Cisco recommends using a coax seal for outdoor connections.
The antenna terminates with a special connector (reverse-TNC plug) after a short, 1-ft. cable. The mating connector to the antenna is an appropriate reverse-TNC jack connector.
Gound the arrestor by using a ground lug attached to the arrestor and a heavy wire (#6 solid copper) and connect the lug to a good earth ground. The part number for the lightning arrestor is AIR-ACC3354.
Any ideas?
Thanks,
Al
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| Chris Thomas 2003-02-25, 9:24 pm |
| In article <nEV6a.341$4O4.64772347@newssvr13.news.prodigy.com>,
allen@somplace.com says...
>
> We hooked the base up on the roof directly to the antenna and it work perfectly.
> We are using cable (rg-58) extensions and is only about 100ft, we think there
> is some loss going on.
SOME loss??? Good grief. One hundred feet of RG-58 at 2.3 Ghz?? You
MUST be kidding. You're loosing 95% of your signal in the coax. Why
do you suppose that Cisco sells that very stiff and heavy large coax
for use with APs, and doesn't even recommend 100' of that? Mount
your AP on the root and extend the Cat5 link to reach it. Or plug a
local antenna directly into wherever the AP is now. Either will work
a whole lot better than 100' of RG-58.
/Chris, AA6SQ
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| Brian V 2003-02-25, 9:24 pm |
| Hey Al,
As a previous posted said, you are using the wrong/too long of a cable (rg58
is not designed for this).
I happen to have a couple of cables left over from a previous install I did.
Cisco part number AIR-420-003346-100 Description: 100ft Low loss antenna,
it's stamped on the jacket 50ohm RG-8, I believe it is the cable you need to
do this with.
If your interested reply with your contact info and I'll get in touch with
you via email or however you prefer.
-Brian
"al" <allen@somplace.com> wrote in message
news:nEV6a.341$4O4.64772347@newssvr13.news.prodigy.com...
Hi all,
We are doing a wireless install for 3bldgs, Aironet 350 root at the main
bldg and two 350s non-root at the other 2 bldgs. We have been getting
intermittent drops between the omni antenna at the main bldg and two bldgs.
We hooked the base up on the roof directly to the antenna and it work
perfectly. We are using cable (rg-58) extensions and is only about 100ft, we
think there is some loss going on.
here are some of the stuff that we followed:
Cisco recommends using a coax seal for outdoor connections.
The antenna terminates with a special connector (reverse-TNC plug) after a
short, 1-ft. cable. The mating connector to the antenna is an appropriate
reverse-TNC jack connector.
Gound the arrestor by using a ground lug attached to the arrestor and a
heavy wire (#6 solid copper) and connect the lug to a good earth ground. The
part number for the lightning arrestor is AIR-ACC3354.
Any ideas?
Thanks,
Al
| |
| Jeremy Parr 2003-02-26, 5:24 pm |
| al wrote:
> Hi all,
>
> We are doing a wireless install for 3bldgs, Aironet 350 root at the main
> bldg and two 350s non-root at the other 2 bldgs. We have been getting
> intermittent drops between the omni antenna at the main bldg and two
> bldgs.
>
> We hooked the base up on the roof directly to the antenna and it work
> perfectly. We are using cable (rg-58) extensions and is only about 100ft,
> we think there is some loss going on.
>
> here are some of the stuff that we followed:
>
> Cisco recommends using a coax seal for outdoor connections.
>
> The antenna terminates with a special connector (reverse-TNC plug) after a
> short, 1-ft. cable. The mating connector to the antenna is an appropriate
> reverse-TNC jack connector.
>
> Gound the arrestor by using a ground lug attached to the arrestor and a
> heavy wire (#6 solid copper) and connect the lug to a good earth ground.
> The part number for the lightning arrestor is AIR-ACC3354.
>
> Any ideas?
>
> Thanks,
>
> Al
RG-58 will lost over 100db of signal at 100ft. You are only txing at 20db
with the Cisco gear, so you can see where the problem might be ;-)
You should use AT LEAST LMR-400 cable for that install, any my Times
Microwave reference card specs the loss at 6.8db/100ft. That is still 3/4
of your signal getting lost, but should be enough to get a solid link at up
to a mile assuming LOS.
I would reccoment locating the AP/Bridge as close to the antenna as possible
and keep the cable run as short as possible.
Out of curiosity, what antennas are you using?
Jeremy
| |
|
| "Jeremy Parr" <jspam@netbahamas.com> wrote in message news:v5qj0k20ach6d5@corp.supernews.com...
> al wrote:
>
> > Hi all,
> >
> > We are doing a wireless install for 3bldgs, Aironet 350 root at the main
> > bldg and two 350s non-root at the other 2 bldgs. We have been getting
> > intermittent drops between the omni antenna at the main bldg and two
> > bldgs.
> >
> > We hooked the base up on the roof directly to the antenna and it work
> > perfectly. We are using cable (rg-58) extensions and is only about 100ft,
> > we think there is some loss going on.
> >
> > here are some of the stuff that we followed:
> >
> > Cisco recommends using a coax seal for outdoor connections.
> >
> > The antenna terminates with a special connector (reverse-TNC plug) after a
> > short, 1-ft. cable. The mating connector to the antenna is an appropriate
> > reverse-TNC jack connector.
> >
> > Gound the arrestor by using a ground lug attached to the arrestor and a
> > heavy wire (#6 solid copper) and connect the lug to a good earth ground.
> > The part number for the lightning arrestor is AIR-ACC3354.
> >
> > Any ideas?
> >
> > Thanks,
> >
> > Al
>
> RG-58 will lost over 100db of signal at 100ft. You are only txing at 20db
> with the Cisco gear, so you can see where the problem might be ;-)
>
> You should use AT LEAST LMR-400 cable for that install, any my Times
> Microwave reference card specs the loss at 6.8db/100ft. That is still 3/4
> of your signal getting lost, but should be enough to get a solid link at up
> to a mile assuming LOS.
>
> I would reccoment locating the AP/Bridge as close to the antenna as possible
> and keep the cable run as short as possible.
>
> Out of curiosity, what antennas are you using?
>
> Jeremy
Here are the antennas we are using:
Air-Ant2506 - 5.2db Omnidr Mast mount
Air-Ant1949 - 13.5db Yagi mast mount - 2 of these for 2 remote sites
Might be a stupid question but are there any amplifiers to amplify the loss signals?
Thanks for you reply,
Al
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