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mhoppes
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Re: Bullet Interference at 780MHz

Im curious about this. Is there any way to alter the processor clock freq through config?
Why hasnt UBNT chimed in on this, you would think that this is an issue Verizon would take up with the FCC eventually, sending out RF engineers has got to cost more than filing a complaint of some form of injunction for intentional interference.

Yes and no. Being Part-15 radiators the interference generated isn't, I don't believe, illegal..... Unless you fail to shut it down when notified about the issue.

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mhammett
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Re: Bullet Interference at 780MHz

I'm surprised there are this many people out there using Bullets. ;-)
I'm on structures with AT&T and Verizon (both 700 MHz users) with no complains, but then again, I only use Rockets.
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Re: Bullet Interference at 780MHz

Come on UBNT, this thread is 6 months old.
And nothing to say???
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Re: Bullet Interference at 780MHz

Hi,
If you're running into this, please contact support@ubnt.com and we can help.
There's nothing wrong with the Ubiquiti equipment, these emissions are normal & expected, and fall within any legal limits (these are tested during FCC approval).

However, we have some test firmware with changed CPU clock speed that makes the harmonic fall outside Verizon's licensed band. If you're working with Verizon, we can give it to you to try.

Thanks,
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Re: Bullet Interference at 780MHz

Come on UBNT, this thread is 6 months old.
And nothing to say???


Actually, SDA, it's about 2.5 years old. ;-)

I'm just not sure why people are using Bullits anyway.
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Re: Bullet Interference at 780MHz

Why's that?
Great little pieces of hardware :icon_biggrin:
I use them mainly for economy PTP links.
For about 160 euros (2 x bullet5 + grid + poe) a ~20 km link is a piece of cake.
Indeed its over 2 years old :manhappy:
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Re: Bullet Interference at 780MHz

Why's that?
Great little pieces of hardware :icon_biggrin:
I use them mainly for economy PTP links.
For about 160 euros (2 x bullet5 + grid + poe) a ~20 km link is a piece of cake.
Indeed its over 2 years old :manhappy:

... and the same thing can be done with a pair of nanobridge links with better throughput and redundancy :mantongue: (for about 130 EUR)
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Re: Bullet Interference at 780MHz

Yes and no. Being Part-15 radiators the interference generated isn't, I don't believe, illegal..... Unless you fail to shut it down when notified about the issue.

While you are still operating within the certification limits, as a tertiary (non-licensed Part 15) use emitter you are interfering with a primary (licensed) use user and would have to mitigate the problem.
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Re: Bullet Interference at 780MHz

While you are still operating within the certification limits, as a tertiary (non-licensed Part 15) use emitter you are interfering with a primary (licensed) use user and would have to mitigate the problem.


Isn't that what I said? :manhappy:
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Re: Bullet Interference at 780MHz

... and the same thing can be done with a pair of nanobridge links with better throughput and redundancy :mantongue: (for about 130 EUR)

Yes you are correct on that.
For 20Km that would be the best choice.
My mistake stating 20Km. What about 35~40Km ?
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Re: Bullet Interference at 780MHz

Yes you are correct on that.
For 20Km that would be the best choice.
My mistake stating 20Km. What about 35~40Km ?


Depends on the freq and local regs. With a NBM5-25, ~40K you're looking at probably a -68 if everything was pretty perfect, and you'd want a noise floor in the low -90's or better. You're better off with a 30dbi rocketdish+rocket at that point.
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Re: Bullet Interference at 780MHz

Isn't that what I said? :manhappy:


Didn't you say as a Part 15 radii it would not be illegal?
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Re: Bullet Interference at 780MHz

I said its not illegal until someone complains (the may not cause harmful interference clause).

-- Sent and mangled via autocorrect, courtesy of my iPhone
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Re: Bullet Interference at 780MHz

I said its not illegal until someone complains (the may not cause harmful interference clause).


-- Sent and mangled via autocorrect, courtesy of my iPhone


I'd assume that most people will work with you if you're causing interference with their licensed equipment/frequencies. Then if you're unable to rectify the problem or remove your equipment then they'll file with the FCC and the FCC will come down and perform a site survey and go from there.

It's in both parties interest to not involve the FCC (because even if you're registered, it's not good to have big brother poking around because you never know what they'll come up with).
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Re: Bullet Interference at 780MHz

Hi,

We have the same issue in Puerto Rico we receive a call from FCC and go there and use his equipment to test...

Ubiquiti it's fine! Legal on paper but the clocking they see like -90 / -85 / -95 basically and the new LTE equipment are so fu... sensitive that they run with -120 so clocking affect his exact band...

In PR the company that own that band it's OPEN MOBILE and in the news couple of weeks they will be Verizon at ALL. They want to compete with ATT here.

So finally the issue it's out there the custom firmware that have for fix the clocking affect the timing of the AP?
Ivan Rivera
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Re: Bullet Interference at 780MHz

If it's collateral interference, the FCC informs you and requires you to take action. They don't consider it willful in the sense that they observed it for at least more than one day and thus assume you should have known what you were doing was a violation; rather they see you acting in the role of a professional installer and were in full Part 15 certification compliance. This in theory lets you test in compliance mode for a day without risking a fine.
An example is the noisy battery chargers that created RF interference. The FCC notified the owner, but he refused to take action. I seem to recall the FCC actually offered some suggestions to fix the problem. The FCC fined him.
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Re: Bullet Interference at 780MHz

I've been working with Verizon on our problem, Nanobridge M5. I installed the custom firmware and it worked great. The Verizon engineer that I've been working with has been really good and helpful. Remember these are not the guys that try to lock you into a bad contract. Ask them questions and they will try. No fear there. I am also using Nanobridge 2.4,Is the clock frequency the same for those also?

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