Or as Murphy would put it, the surest way to get about average rainfall
this year is to put up a marginal 24GHz link.
On 10/23/2014 11:56 AM, Faisal Imtiaz wrote:
>>Assuming the charts are accurate... for our area, they don't seem
to be. Doug Watkins has made a ton of observations regarding the rain
our area receives and the imposed signal loss. The charts\math isn't
always correct.
Yes, there is nothing absolute there, if you want a full reading of
the chart, which is historically complied, you will see that each area
has a range of rain and a mathematical probability associated with it.
While it would be appropriate to state that real life experience
observed (non scientifically) can differ with the charts, however
expecting more optimistic results as potentially predicted by the
charts would be a significant judgement in error ...
(It's like the 100 year flood zone... if nothing happens in your
lifetime, you can say... I don't believe in it, however if it happened
once in your lifetime, one would have a different opinion,
scientifically, the probability of two 100 year events happening in
one lifetime is very small, but in reality it is still possible).
Faisal Imtiaz
Snappy Internet & Telecom
7266 SW 48 Street
Miami, FL 33155
Tel: 305 663 5518 x 232
Help-desk: (305)663-5518 Option 2 or Email: [email protected]
------------------------------------------------------------------------
*From: *"Mike Hammett" <[email protected]>
*To: *"Ubiquiti Users Group" <[email protected]>
*Sent: *Thursday, October 23, 2014 8:37:51 AM
*Subject: *Re: [Ubnt_users] Airfiber 24 or 5
Assuming the charts are accurate... for our area, they don't seem
to be. Doug Watkins has made a ton of observations regarding the
rain our area receives and the imposed signal loss. The
charts\math isn't always correct.
-----
Mike Hammett
Intelligent Computing Solutions
http://www.ics-il.com
------------------------------------------------------------------------
*From: *"Faisal Imtiaz" <[email protected]>
*To: *"Ubiquiti Users Group" <[email protected]>
*Sent: *Wednesday, October 22, 2014 9:48:36 PM
*Subject: *Re: [Ubnt_users] Airfiber 24 or 5
Let's put this into context... Rain fade varies from place to
place, region to region, you can find specifics about your area
via ITU rain fall charts.
South Florida is listed as Rain Fall 'n' region, part of the worst
group on the charts
24Ghz, is affected by size of the rain drops and how 'hard' it
rains.. (how fast it rains... rain speed ?)
e.g looking at attenuation on 24ghz due to rain, at 2km, it is
0.4db for 1.25mm/hr rain fall, however for the same distance it
jumps to 8db for 25mm/hr rainfall. FYI Rain Zone N can have
rainfall between 5mm/hr to 180mm/hr !)
Airfiber24, will drop link somewhere about -80/-80...
So if you short link has a -40 or -38 signal, then you have 40db
to play with before it drops..
Lots of factors that go into this, and above is a summary listing
of what they are...
This is the reason why, one simply must keep the location in mind,
before comparing someone else's experience...
(unless of-course that someone else is in the same rain fall region).
As we say ... YMMV !
:)
Regards
Faisal Imtiaz
Snappy Internet & Telecom
7266 SW 48 Street
Miami, FL 33155
Tel: 305 663 5518 x 232
Help-desk: (305)663-5518 Option 2 or Email: [email protected]
------------------------------------------------------------------------
*From: *"Clay Stewart" <[email protected]>
*To: *"Ubiquiti Users Group" <[email protected]>
*Sent: *Wednesday, October 22, 2014 10:26:58 PM
*Subject: *Re: [Ubnt_users] Airfiber 24 or 5
Have AF24 links from .5 to 1 mile and have seen zero rain
fades so far. Set at just under 800Mbps.
On Oct 22, 2014 4:58 PM, "Daniel Peoples" <[email protected]
<mailto:[email protected]>> wrote:
I've always wanted to ask this, but if it's across a
street and its high enough, why can you just get a piece
of aerial fiber and a bow and string it?
/Daniel Peoples/
Resonance Broadband
/Resonancebroadband.com/ <http://Resonancebroadband.com>
918-429-3620
On Wed, Oct 22, 2014 at 3:55 PM, Adair Winter
<[email protected]
<mailto:[email protected]>> wrote:
I didn't read this right. I missed minimum. oops!
On Wed, Oct 22, 2014 at 3:49 PM, Kees H
<[email protected]
<mailto:[email protected]>> wrote:
What is the minimum distance for either one of those?
Have a request for 2 (large) buildings across a
street.
_______________________________________________
Ubnt_users mailing list
[email protected] <mailto:[email protected]>
http://lists.wispa.org/mailman/listinfo/ubnt_users
--
Adair Winter
VP, Network Operations / Owner
Amarillo Wireless | 806.316.5071 <tel:806.316.5071>
C: 806.231.7180 <tel:806.231.7180>
http://www.amarillowireless.net
_______________________________________________
Ubnt_users mailing list
[email protected] <mailto:[email protected]>
http://lists.wispa.org/mailman/listinfo/ubnt_users
_______________________________________________
Ubnt_users mailing list
[email protected] <mailto:[email protected]>
http://lists.wispa.org/mailman/listinfo/ubnt_users
_______________________________________________
Ubnt_users mailing list
[email protected]
http://lists.wispa.org/mailman/listinfo/ubnt_users
_______________________________________________
Ubnt_users mailing list
[email protected]
http://lists.wispa.org/mailman/listinfo/ubnt_users
_______________________________________________
Ubnt_users mailing list
[email protected]
http://lists.wispa.org/mailman/listinfo/ubnt_users
_______________________________________________
Ubnt_users mailing list
[email protected]
http://lists.wispa.org/mailman/listinfo/ubnt_users
_______________________________________________
Ubnt_users mailing list
[email protected]
http://lists.wispa.org/mailman/listinfo/ubnt_users
