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Cell Tower Interference Fact or Fiction??
1318 24 2022-5-25
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Marleyman
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I have seen a billion posts and differing opionions about this -

I am using a Mavic 2 Pro w/Smart Controller to inspect buildings that have cell towers mounted on the buildings.

I am told by other Drone Pilots that do Cell Tower Inpections for a living - that "NO the cell towers would not interfere with my Mavic 2 Pro/Smart Controller. How else could we use our DJI Drone to inspect them?"


But I am finding a ton of forum posts and videos from people saying YES - the cell towers can interfere with my Mavic 2 Pro/Smart Controller.

Does anyone out there have a definitive YES or NO on this?
Would appreciate hearing from you!
thanks


2022-5-25
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Labroides
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Does anyone out there have a definitive YES or NO on this?
Who are you going to believe .. the people that actually do it or some forum turkeys who have no idea but don't bother that they are spreading myths and misinformation?
2022-5-25
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Marleyman
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Labroides Posted at 5-25 07:41
Does anyone out there have a definitive YES or NO on this?
Who are you going to believe .. the people that actually do it or some forum turkeys who have no idea but don't bother that they are spreading myths and misinformation?

Well what's "bothersome" is that people posting in this DJI Forum are reporting cell phone tower interference - so why are they saying that if it didn't happen to them? I'm just trying to be sure.
2022-5-25
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Labroides
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Marleyman Posted at 5-25 07:43
Well what's "bothersome" is that people posting in this DJI Forum are reporting cell phone tower interference - so why are they saying that if it didn't happen to them? I'm just trying to be sure.

That's the nature of forums.
You get lots of people who will guess or post something they heard somewhere.
Misinformation is as common as accurate information.
2022-5-25
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Marleyman
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Labroides Posted at 5-25 07:45
That's the nature of forums.
You get lots of people who will guess or post something they heard somewhere.
Misinformation is as common as accurate information.

I agree with you....so you yourself don't know the answer to my question?
2022-5-25
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Labroides
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Marleyman Posted at 5-25 07:47
I agree with you....so you yourself don't know the answer to my question?

I know .... but if you read my first post you'd know what I think.
2022-5-25
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Falcoc
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Flying too close to a cell tower while you are too far away with your remote can cause signal problems. The closer your remote to drone is, the more you can get away with flying close to cell towers. Every transmitter swamps other frequencies near and even far away from the indented resonance frequency at very close range. It also depends on the quality, transmission power and sensitivity of your TX/RX equipment. How the transmission protocol handles interferences plays a role as well.  
2022-5-25
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DowntownRDB
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You might find this article of interest.  

https://thelegaldrone.com/electr ... -flying-your-drone/
2022-5-25
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Geebax
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Cell towers do not transmit on the same frequency band as we use, not even close. User Falcoc refers to a principle called Front End Overload, but in my experience, the receivers in the aircraft are well enough designed to not suffer from this effect. I have done circular flights around high power microwave communication towers and never got any interference. Most times the problem is as Labroides says, these reports come from technically ignorant posters.
2022-5-25
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HedgeTrimmer
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Geebax Posted at 5-25 15:59
Cell towers do not transmit on the same frequency band as we use, not even close. User Falcoc refers to a principle called Front End Overload, but in my experience, the receivers in the aircraft are well enough designed to not suffer from this effect. I have done circular flights around high power microwave communication towers and never got any interference. Most times the problem is as Labroides says, these reports come from technically ignorant posters.

I thought he was describing the frequency doubling and tripling (2nd and 3rd harmonics)?

Whereas Front End Overload involves too strong a signal being further amplified by front end of receiver to point, the signal (radio channel / frequency) desired is lost amongst over amplification noise of neighboring signals.
2022-5-25
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HedgeTrimmer
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What you are asking about is "Bleed Over".  Transmitters designed or set  to transmit on specific frequencies, which also (unwantingly) transmit at greatly reduced power on neighboring frequencies.  

One article discussing Cellular LTE "Bleed Over" to lower frequencies of which are higher channels in TV band.
https://www.techhive.com/article ... or-tv-antennas.html

2022-5-25
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Bob-Mini-2
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DowntownRDB Posted at 5-25 09:56
You might find this article of interest.  

https://thelegaldrone.com/electromagnetic-interference-when-flying-your-drone/

Nice . . .it has been many many years since I have seen the name SURE,  they have made some of the best microphones, I favored the Controlled Magnetic, when I was working.  The video brought back much, thank you for listing it for others to see.
2022-5-25
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Geebax
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HedgeTrimmer Posted at 5-25 17:51
I thought he was describing the frequency doubling and tripling (2nd and 3rd harmonics)?

Whereas Front End Overload involves too strong a signal being further amplified by front end of receiver to point, the signal (radio channel / frequency) desired is lost amongst over amplification noise of neighboring signals.

He could have been, I read it differently I suppose. Either way, modern receiver circuitry tends to be implemented in silicon and is typically very selective, way better than discrete designs of old.
2022-5-25
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HedgeTrimmer
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Geebax Posted at 5-25 18:40
He could have been, I read it differently I suppose. Either way, modern receiver circuitry tends to be implemented in silicon and is typically very selective, way better than discrete designs of old.

And often tweak-able via firmware.  Which can quickly bring improvements and fixes without expensive hardware  changes.  On flip, all it takes is a programing error or poorly thought and tested changes to cause problems.
2022-5-25
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Geebax
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HedgeTrimmer Posted at 5-25 19:37
And often tweak-able via firmware.  Which can quickly bring improvements and fixes without expensive hardware  changes.  On flip, all it takes is a programing error or poorly thought and tested changes to cause problems.

Yes, and that would be on the cards according to my experiences with DJI. Often implement poorly tested software.
2022-5-25
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DJI Stephen
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Hello there Marleyman. Good day and thank you for reaching out. DJI recommends for you to keep away from the power lines and cell towers if applicable. The DJI drone might picked up magnetic interference from rebar concrete and metal objects / structures and might caused unwanted incident when flying. Thank you.
2022-5-25
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Marleyman
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DJI Stephen Posted at 5-25 20:21
Hello there Marleyman. Good day and thank you for reaching out. DJI recommends for you to keep away from the power lines and cell towers if applicable. The DJI drone might picked up magnetic interference from rebar concrete and metal objects / structures and might caused unwanted incident when flying. Thank you.

DJI Stephen your reply is what causes my confusion on this topic!
DJI Drones are used to inspect Cell Towers - and you say "DJI recommends that you stay away from Cell Towers...they could interfere with your drone...."
Riddle me this - if DJI drones are used to inspect cell towers by professional drone pilots - why does DJI recommend that you don't fly near cell towers???
2022-5-26
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Labroides
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Marleyman Posted at 5-26 02:46
DJI Stephen your reply is what causes my confusion on this topic!
DJI Drones are used to inspect Cell Towers - and you say "DJI recommends that you stay away from Cell Towers...they could interfere with your drone...."
Riddle me this - if DJI drones are used to inspect cell towers by professional drone pilots - why does DJI recommend that you don't fly near cell towers???

Ignore his post ... it's just misinformation from someone who doesn't even fly a drone.
He's just copying and pasting something he thinks might be relevant.
You'd have to be within a metre of a tower for it to have any effect on your compass and you are unlikely to  be close to any reinforced concrete up there.


2022-5-26
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Marleyman
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Labroides Posted at 5-26 02:58
Ignore his post ... it's just misinformation from someone who doesn't even fly a drone.
He's just copying and pasting something he thinks might be relevant.

Thanks Labroides! Just what I needed to hear
2022-5-26
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Labroides
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Marleyman Posted at 5-26 02:59
Thanks Labroides! Just what I needed to hear

Unfortunately the moderators in here appear to have no technical knowledge or actual flying experience.
2022-5-26
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DowntownRDB
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Bob-Mini-2 Posted at 5-25 18:21
Nice . . .it has been many many years since I have seen the name SURE,  they have made some of the best microphones, I favored the Controlled Magnetic, when I was working.  The video brought back much, thank you for listing it for others to see.

You're welcome Bob.  Hope you are having a great week.
2022-5-26
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Bob-Mini-2
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DowntownRDB Posted at 5-26 03:17
You're welcome Bob.  Hope you are having a great week.

You as well, hope you are getting some flying in
2022-5-26
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DowntownRDB
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Bob-Mini-2 Posted at 5-26 11:54
You as well, hope you are getting some flying in

Thanks Bob.  Having a good but busy week.  Prepping to take my large live aboard boat on an excursion in the Caribbean.  So many items on my "make sure it's ready list" but I'm excited to set out soon.
2022-5-26
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Bob-Mini-2
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DowntownRDB Posted at 5-26 12:08
Thanks Bob.  Having a good but busy week.  Prepping to take my large live aboard boat on an excursion in the Caribbean.  So many items on my "make sure it's ready list" but I'm excited to set out soon.

Have a splendid trip . . .
2022-5-26
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DowntownRDB
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Bob-Mini-2 Posted at 5-26 12:25
Have a splendid trip . . .

Thank you kind sir.  
2022-5-27
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