That would be the part of a horn antenna that is most important, the
very high fall off outside of the spec'd beam width without the nulls
and peaks outside. Short story, ran into a FAA tech looking for
interference of a ground radar at the local airport. He was on a hill
with a 5! foot horn antenna looking for the source ( it was a Macintosh!
with a bad rf seal about 6 miles away from the radar ).. Huge work to
swing that 30 db antenna but knowing the radial of the interference was
exact. He nailed the location in 1/2 day to the exact house.
On 4/11/18 8:21 AM, ch...@wbmfg.com wrote:
Speaking generally here, not about this product specifically:
A 30 is a 30 at some dB down from peak. Most reputable antenna
manufacturers cite the beamwidth at the 3 dB down points on each side of
the main lobe. That is called HPBW or half power beam width.
Some go out farther to the 6 dB point to make their beam width seem
wider than their competitors. Personally I believe that is false
advertising. But I am sure they do not share my opinion.
Look at the type of beamwidth. Should state how many dB down somewhere
on the spec sheet.
Other than that, horn antennas are very well characterized. They are
used as lab standard calibration antennas. Other than the point where
they choose to specify the beamwidth I think you can totally trust the
*From:* Steve Jones
*Sent:* Wednesday, April 11, 2018 9:01 AM
*Subject:* Re: [AFMUG] Rfelements
so if im getting the right feel, here, I CAN trust these spec sheets? a
30 is actually 30 and not 90? FB is real?
Ive had two in play on EPMP1000 for some time but i keep pulling them
and moving them elsewhere because of changes, so Ive never had one up
long enough to see. I have use case for narrower patterns and more APs
at some sites because the uplinks are getting more interference than id
prefer, my only other option is to add the secondary antenna on the
2000, im not a fan of adding windload with no net capacity gain
On Wed, Apr 11, 2018 at 9:57 AM, Steve Jones <thatoneguyst...@gmail.com>
we have a substantial garbage dump
On Wed, Apr 11, 2018 at 9:08 AM, Jaime Solorza
There's mountains near Steve's WISP footprint?
On Wed, Apr 11, 2018, 7:45 AM Mike Hammett <af...@ics-il.net> wrote:
You have that the other way around. A horn would be ideal in
a mountain area.
Intelligent Computing Solutions <http://www.ics-il.com/>
Midwest Internet Exchange <http://www.midwest-ix.com/>
The Brothers WISP <http://www.thebrotherswisp.com/>
*From: *"Sean Heskett" <af...@zirkel.us>
*Sent: *Tuesday, April 10, 2018 10:49:19 PM
*Subject: *Re: [AFMUG] Rfelements
I Totally agree with josh.
They have a specific purpose so if you can deploy within
those parameters they are great.
Unfortunately our area isn’t conducive to that type of
deployment because of terrain. In the mountains you need
antennas with a wider vertical beam because your towers are
on mtn peaks and some clients are same height as the tower
and other clients are on the valley floor. It’s hard to use
a spot beam to cover all that.
In the Midwest or other flat areas I could see them being
useful to spot beam the population centers.
On Tue, Apr 10, 2018 at 8:29 PM Josh Reynolds
They are great for stuff like 30/40Mhz wide, gps sync,
put 4-6 on a pole in a subdivision or on a tower leg
If anybody thought they were for something else (ie long
range), they didn't read the data sheets.
Lightweight, low size, low wind load, perfectly circular
pattern - great spot beams. Good F/B ratio.
On Tue, Apr 10, 2018, 9:12 PM Robert
I recently did a couple of tests with RF horns. I
was hoping for a lot
and was disappointed. I was hoping that they could
closer than regular sectors that I use and the
crosstalk signal levels
were just about the same as the shielded sectors.
As far as the
signals at the CPE's they were pretty good but not
amazingly better for
as small as the target area got reduced to.
On 4/10/18 6:43 PM, Steve Jones wrote:
> Can i get some non fanboy real world on these
guys? Btw, i hate facebook
> groups almost as much as dslreports or the ubnt
forums, this is
> literally the only place to get legitimate