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'[BUY] Outdoor wifi antenna.'
2017\10\10@105249 by Peter Q.

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Hi there, I am going to buy an outdoor antenna wifi 2.4 ghz
omni-directional, so what is recommended for you? Experience please; tips,
brands.

And what's else?


Thanks in advance.
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2017\10\10@110150 by Peter Q.

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Oups!

I forget it!

It look like a tp link model: tl-ant2408cl


Thanks

On Oct 10, 2017 9:52 AM, "Peter Q." <spam_OUTbtoven66TakeThisOuTspamgmail.com> wrote:

> Hi there, I am going to buy an outdoor antenna wifi 2.4 ghz
> omni-directional, so what is recommended for you? Experience please; tips,
> brands.
>
> And what's else?
>
>
> Thanks in advance.
>
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2017\10\10@111023 by Jean-Paul Louis

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Peter,Before buying this antenna,  define the need. I assume that you already have WIFI inside the house. Why do you need omnidirectional?if you want to cover the backyard,  you need 180 degrees coverage, not 360..
Just a thought Jean-Paul N1JPL 

Sent from Yahoo Mail on Android

 On Tue, Oct 10, 2017 at 10:55 AM, Peter Q.<.....btoven66KILLspamspam@spam@gmail.com> wrote:   Hi there, I am going to buy an outdoor antenna wifi 2.4 ghz
omni-directional, so what is recommended for you? Experience please; tips,
brands.

And what's else?


Thanks in advance.
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2017\10\10@113021 by Peter Q.

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Hi jean. The application is industrial system on bus so the equipment is
required to communicate with wifi access point 360 is required.

On Oct 10, 2017 10:10 AM, "Jean-Paul Louis" <louijpspamKILLspamyahoo.com> wrote:

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2017\10\10@113659 by Richard Pytelewski

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https://www.amazon.com/TP-Link-Omni-directional-Antenna-connector-TL-ANT2408CL/product-reviews/B004UBUE2O

Check out rating on Amazon.

Rich
TP-Link 2.4GHz 8dBi Indoor Omni-directional Antenna, 802 ...<www.amazon.com/TP-Link-Omni-directional-Antenna-connector-TL-ANT2408CL/product-reviews/B004UBUE2O>
http://www.amazon.com
Find helpful customer reviews and review ratings for TP-Link 2.4GHz 8dBi Indoor Omni-directional Antenna, 802.11n/b/g, RP-SMA Female connector (TL-ANT2408CL) at ...




________________________________
From: EraseMEpiclist-bouncesspam_OUTspamTakeThisOuTmit.edu <piclist-bouncesspamspam_OUTmit.edu> on behalf of Peter Q. <@spam@btoven66KILLspamspamgmail.com>
Sent: Tuesday, October 10, 2017 7:56 AM
To: Microcontroller discussion list - Public.
Subject: Re: [BUY] Outdoor wifi antenna.

Oups!

I forget it!

It look like a tp link model: tl-ant2408cl


Thanks

On Oct 10, 2017 9:52 AM, "Peter Q." <KILLspambtoven66KILLspamspamgmail.com> wrote:

> Hi there, I am going to buy an outdoor antenna wifi 2.4 ghz
> omni-directional, so what is recommended for you? Experience please; tips,
> brands.
>
> And what's else?
>
>
> Thanks in advance.
>
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2017\10\10@123853 by Forrest Christian (List Account) n/a

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What distances, visibility, environment, etc?

I can provide you with some very good suggestions but things like distance
matters.  If you could describe a bit more about the application, I can
point you in the right direction(s).



On Oct 10, 2017 8:38 AM, "Peter Q." <RemoveMEbtoven66TakeThisOuTspamgmail.com> wrote:

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2017\10\10@131227 by Peter Q.

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Hi Forrest, open-air application.

On Oct 10, 2017 11:39 AM, "Forrest Christian (List Account)" <
RemoveMElistsspamTakeThisOuTpacketflux.com> wrote:

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2017\10\10@131333 by Peter Q.

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And the distance 1 km to the round

On Oct 10, 2017 12:11 PM, RemoveMEbtoven66spam_OUTspamKILLspamgmail.com wrote:

Hi Forrest, open-air application.

On Oct 10, 2017 11:39 AM, "Forrest Christian (List Account)" <
RemoveMElistsTakeThisOuTspamspampacketflux.com> wrote:

What distances, visibility, environment, etc?

I can provide you with some very good suggestions but things like distance
matters.  If you could describe a bit more about the application, I can
point you in the right direction(s).



On Oct 10, 2017 8:38 AM, "Peter Q." <EraseMEbtoven66spamspamspamBeGonegmail.com> wrote:

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2017\10\10@173526 by RussellMc

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A link loss calculator will be of use.
Partial list of need to knows:

What is the tx/rx unit used?
What TX power and what receive sensitivity.
What are the "remotes" specs?
How high is antenna above surrounding ground?
What is building construction if aerial indoors.
Cable used: Type, length, loss per unit length?
Connectors: Quantity, losses?
.... ?

Mr Garglabet says:  http://bit.ly/google_wifilinkloss



This is simple to use but seems reasonable.

            http://www.radiolabs.com/stations/wifi_calc.html

Also

http://store.freenet-antennas.com/linkbudget.php

http://www.swisswireless.org/wlan_calc_en.html

http://www.tranzeo.com/allowed/Tranzeo_Link_Budget_Whitepaper.pdf

....



Russell



On 11 October 2017 at 03:52, Peter Q. <spamBeGonebtoven66STOPspamspamEraseMEgmail.com> wrote:

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2017\10\10@174911 by Van Horn, David

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Possibly useful for this or other similar applications        http://www.ve2dbe.com/rmonline.html

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2017\10\10@181836 by mike brown

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That much distance with omni antennas (at each end?) is likely to be
problematic.   You might have better success with the fixed end being
directional.

On Oct 10, 2017 4:56 PM, "Van Horn, David" <
KILLspamdavid.vanhornspamBeGonespambackcountryaccess.com> wrote:

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2017\10\10@234920 by Jean-Paul Louis

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I agree 100% with Mike.

1km Wifi will need a high gain antenna at the user end while the access point will be omnidirectional.
I hope you can be OK at 1km line of sight with a high gain Yagi or similar as 2.4GHz can be fickle.


{Quote hidden}

Just my $0.02,

Jean-Paul
N1JPL




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2017\10\11@001009 by Forrest Christian (List Account) n/a

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What country?

Is your intent to put an Omni on the bus as well?

You're going to need good quality radios with decent antennas on both ends.


On Oct 10, 2017 10:21 AM, "Peter Q." <spamBeGonebtoven66spamKILLspamgmail.com> wrote:

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2017\10\11@001305 by James Cameron

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With enough height above ground, and very flat ground, it is doable.  ;-)

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http://quozl.netrek.org/
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2017\10\11@003742 by Forrest Christian (List Account) n/a

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At 1km the 80% fresnel clearance is 4.5m, so in a perfectly flat and open
environment, you only need to be up 4.5m on both ends, or higher on one end
or the other, so that the middle is above 4.5m.    This is assuming a
modulation where this truly matters.  With OFDM, often one can intrude into
the fresnel zone a bit more since the resulting multipath can actually help
instead of hinder the data link in some cases (depending on the obstruction
and the environment)

I realize with one end being a bus, the OP may need to elevate one end or
the other.

PLUS, this clearance is above any obsticles.   So if there are trees or
buildings in the middle of the path, you'll need to be higher, and yes,
hills and ground 'shape' will also affect this.

1km is definitely doable with a clear line of sight (including fresnel
distances) in most countries with modest antennas.    Directional on one or
both will be preferred to reduce the quantity of noise received from other
sources.   I'm probably going to point the OP toward a set of AP's with
sectoral Antennas for the fixed location, and an either an omni or a mimo
radio mounted on each bus.   Omni on both sides would probably work as
well, but is more likely to have  interference issues.

On Tue, Oct 10, 2017 at 10:12 PM, James Cameron <spamBeGonequozl@spam@spamspam_OUTlaptop.org> wrote:

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2017\10\11@042926 by Allen Mulvey

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Have you given any thought to distributed access points? If
there is networking available along the route you could use
something like a Cisco Unified Wi-Fi system. Several years
ago I bought some "end of life" radios and a few
controllers. I distributed radios around my house and my
church with a controller at each location. I could have run
them off the same controller but I wanted them isolated. The
user can move around the premises and his device will
seamlessly switch to the strongest signal. My radios support
both 2.4 and 5 mhz. I disabled the 5 mhz. side to save
energy and the cost of additional antennas.

Allen

> {Original Message removed}

2017\10\11@075516 by mike brown

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At 1km, the path loss of 2.4GHz is almost 100dB.  Combined with feed line
loss, that's going to be quite the challenge with omni antennas.  Figuring
25dBm transmitters, a receiver sensitivity of -85dBm, 20dB of total feed
line loss and 8dBi of antenna gain at each end, the margin is less than
5dB. I don't think that's going to work reliably, and then there's the rain
factor along with outside interference.

Maybe a high gain antenna at the base that can automatically track the
vehicle?  Is that available?  More importantly, is that in the budget?

How about the option of using Cellular data and OpenVPN to secure your link?

This is the piclist after all; there's always the pessimistic view
supported with "facts", but then someone pulls it off. ;)

On Oct 11, 2017 3:36 AM, "Allen Mulvey" <allenEraseMEspamamulvey.com> wrote:

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> > {Original Message removed}

2017\10\11@105907 by Van Horn, David

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I once did a wifi video connection between an unmodified USB wifi stick and another point, literally across the city of Pittsburgh.   The other end used a diversity pair of 12dB helicals. Radio mobile helped me choose the locations, and having a line of sight path worked wonderfully.

Omni antennas will need to be high, and possibly with a little down-tilt.  Foliage can be the end of your signal.


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2017\10\11@160359 by Richard Prosser

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Hi Peter,
Just a quick check you really need wifi access. We use Cirronet (now
Murata) modules at 2.4GHz for RS232 type communications and can achieve
that sort of range under open conditions. Output power is either +10 or
(about +18) dBm depending on our range requirement & etc. This using
standard "ruibber duck" antennae on hand held equipment.
The modules use frequency hopping and (presumably) error correction to
achieve the communications although we have had some degradation when used
in combination with some bluetooth modules.

Maximum data rate is 115200b/sec although I think there are other modules
that will work at higher bandwiidths.

But then, if you only need RS232 data rates, 433 or 900MHz modules may be
more appropriate anyway.

Richard P

On 12 October 2017 at 03:59, Van Horn, David <
RemoveMEdavid.vanhornEraseMEspamspam_OUTbackcountryaccess.com> wrote:

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2017\10\11@170526 by mike brown

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Here is something that might be helpful.  The company claims 16 dBi gain
and 120 degree spread.  Not omni, but might work depending upon your
actual topography.  It's cheap, so....   I believe it's also 5GHz
(802.11ac) only which may or may not be okay with you.  Less interference
on that band, much less.   Maybe 3 on a pole to get 360 degree coverage.
They have a lot of other interesting equipment as well, ie microwave PTP
links and Ethernet bridges.  I've never used any of it, but the reviews
seemed decent.  I'm thinking of buying something like this now.  ;)  I
need to communicate with some ESP8266 based sensors that are kinda far
away and down low.

www.amazon.com/Ubiquiti-LiteBeam-802-11ac-built-Degree/dp/B019M0KK
44/ref=sr_1_fkmr0_1?s=electronics&ie=UTF8&qid=1507755240&sr=1-1-fkmr0&keyw
ords=ubiquiti+litebeam+ac+ap

Here is the manufacturer's page:
https://www.ubnt.com/airmax/litebeam-ac-ap/
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