Rocket Dish specs

[opampca]

I find strange that a dish has 137/118 degrees beamwidth.
Is this an error, never seen such wide bandwith for a 28/30 dbi gain ?
Also unusual is a electrical downtilt on a dish ??

Any comments ?

[UBNT-Mike.Ford]

Hello,

What data sheet are you seeing this on? This is a complete error.

Thanks,

Mike

[opampca]

http://ubnt.com/downloads/Rocket_Dish5G-30.pdf

[UBNT-Mike.Ford]

http://ubnt.com/downloads/Rocket_Dish5G-30.pdf

Hello,

Checking into this.

Thanks,

Mike

[opampca]

Hi,
Thank you for the fast correction...
Richard

[UBNT-Mike.Ford]

Hi,
Thank you for the fast correction...
Richard

Thanks for pointing it out!

Mike

[davey]

I sent you a PM on that 15 mins after it was released!

[Aveyer]

I also noticed that odd beamwidth spec, thanks for the fix.

[motofan]

Well, now that the beamwidth is corrected... how about those return loss/VSWR numbers?

Spec says worse case is 1.4:1 VSWR (-15.56dB return loss) over 4.9-5.9GHz... but have a close look at that return loss chart.

The BEST return loss it shows is about -12.6dB (about 1.6:1 VSWR)!

So what is it supposed to be? I wouldn't expect great performance from such a wide band antenna, but that return loss is getting pretty high.


Cheers!

[Dave-D]

While we're on those antenna specs:

That windloading spec is not windloading--
it's survivability--the maximum wind the antenna
can take--not that the tower can take.

Wind loading is the effective surface area in the wind;
it's in sq.ft or sq.M. From that, the force the antenna
exerts on the tower can be calculated for any
windspeed and the tower survivability with that
antenna can be estimated. That is likely a lower
windspeed than the antenna maximum.

Ubiquity should provide those specs for the dishes
(unless somebody here has a reliable estimate
based on its dimensions).

I was hoping you would offer a dual-polarity grid;
the small towers I use won't take the wind load
from a high-gain dish. Dave

[UBNT-Ben]

Hi Guys,

Wind loading specs are as follows:

100Mph - 113 lbs
125Mph - 177 lbs

With a radome these numbers go down drastically.

While these antennas are wideband, they are extremely high performance (meet the most stringent ETSI specifications for backhaul antennas).

As for a dual polarity grid, the problem that you run into due to wire spacing at this frequency is that when you lay out the wires you quickly turn the grid into a solid dish to get good performance ;-)

Regards,

[WHT]

If you don't have domes yet for the Rocket Dish, do you have any idea f the L-Com ones would work?

[Dave-D]

That's a lot of wind-loading, Ben!

I need 125Mph (which is the survivability rating
of the antenna anyhow). And 177lb. is beyond
the limit of most lightweight free-standing towers.

If I take a good 30dbi grid and tighten up the grid
pattern so it's the same H as V, there are still a
lot of holes to let the wind through. Dave

[UBNT-Mike.Ford]

That's a lot of wind-loading, Ben!

I need 125Mph (which is the survivability rating
of the antenna anyhow). And 177lb. is beyond
the limit of most lightweight free-standing towers.

If I take a good 30dbi grid and tighten up the grid
pattern so it's the same H as V, there are still a
lot of holes to let the wind through. Dave

Hey Guys,

Remember those are wind loads with out the Radome. With the radome they drop significantly. I will get the specs with the radome for you.

Thanks,

Mike

[opampca]

So, is the radome included with the dish ?
There are no illustration or even mention of it...

[UBNT-Ben]

The radome is not included, but we will be offering shortly. Will check to see if any radomes on the market will work with these in the short term.

Depending on the type of radome (rounded), wind load is as follows:

100mph - 70
125mph - 110

Regards,

[claudio421]

Has anyone gotten their hands on the actual physical measurements of the Rocket Dish? The datasheet doesnt specify that.

Thanks,
Claudio

[WHT]

I did get my hands on the Rocket feedhorn assemble last April and the first thought that ran through my mind was ...."This would be a hot item at Spencer's Gifts in the mall!"

[jovanny]

Hello Fellow wanted to know that profit offers the RocketDish Radome apart from diminishing the intensity of the wind would have better signal but tax of transfer or would lose signal or transfer if I install it somebody has used it that so much it would improve the communication expect his help thank you in advance.

[Dave-D]

A radome provides three improvements:
> reduces windload by as much as 1/3
> prevents snow build-up on the feedhorn
> reduces chance of feedhorn damage from
falling ice or wind-blown debris

But it also reduces rf output slightly, depending
on material and thickness, by about 1 to 3dB.

Note Ubiquiti still doesn't market a radome; use
either the compatible one from Pacific Wireless
or the complete kit from 'Sirhc'. Dave

[sbyrd]

A radome provides three improvements:
> reduces windload by as much as 1/3
> prevents snow build-up on the feedhorn
> reduces chance of feedhorn damage from
falling ice or wind-blown debris

But it also reduces rf output slightly, depending
on material and thickness, by about 1 to 3dB.

Note Ubiquiti still doesn't market a radome; use
either the compatible one from Pacific Wireless
or the complete kit from 'Sirhc'. Dave

Yes Ubiquiti does have radomes available. I have 4 of them for my 2' Rocket Dishes.
http://streakwave.com/ItemDesc.asp?ic=RAD%2D2RD

[Dave-D]

Thanks! I stand corrected...

Not only a radome for the 30dBi
dish, but also for the 34dBi!

I can't suggest what the rf attenuation
might be, because it hasn't been
specified. No installer has yet posted
a value that I've seen. Dave

[sbyrd]

I do not know how much db loss the radome causes, but on a 7.5mile ptp 3.65ghz link I get a signal 4db less than my calculations show.