I find the airplane operators/pilot overentiteled. Why shut down 5G as some of them suggest if its the altimeters on the planes that are actually defective/not within spec.
Is there any evidence this is the case? This sort of thing is a lot like property zoning. If a steel mill starts up next door to your residential property in what used to be a park then there is nothing stopping you from adding more sound proofing to your walls to make it so you can sleep. But should you have to do this and can you do this at all? In this case the neighbouring band was originally used for satellite downlinks. So barely detectable signals with large dishes required. Radar altimeters in aircraft actually used to cause interference to the satellite downlinks when the aircraft flew over.
The fact is that you need to have sufficient physical separation between services in adjacent bands. In this case, you can't expect things to work if an aircraft flies directly over a 4 GHz 5G transmitter at a low altitude. This aspect of adjacent band interference is an important part of spectrum management. You can't just wave the issue away...
It's more like the family who is first to move into a neighborhood under construction, complaining that their kids can no longer play in the empty lots because houses are being built there. And it's not even the empty lot next to them, but one lot over.
Then what is the required passband attenuation at 220 MHz away from the centre frequency as per the spec? What altimeters are not meeting this spec?
I find it weird that people are claiming that the altimeters are defective here. That would be a big deal if true.
This sort of thing is why allocating TV frequencies is and was complicated. That is because someone might live right next door to a TV transmitter and they might be trying to watch a weak signal on an adjacent channel. You usually have to allocate some dead channels for the area to prevent receivers from being overloaded. So in that case would it be fair to say that receiver was using channels it had no right to when set to the weaker signal? After all, the transmitter was there before the receiver was...
Note that other countries have managed to deal with this routine and common issue with respect to the introduction of 4 GHz 5G. There is something weird going on in the USA...
If we go this way we would have to defund highway patrols because it is waste of time (traffic rules already specify how to drive safely). You don't need IRS (because law says how to pay taxes).
Also try to understand those pilots did not manufacture the equipment they are flying. They bought equipment that was certified to be airworthy or are flying for somebody who owns the equipment that was certified to be airworthy.
This is like standard practice for shit that is of trivial importance to humanity in a newish engineering field. So I don’t for the life of me understand the logic of being more flippant when it comes to human lives in a more established engineering field.
I see 3 solutions: 1: shut down 5G. 2: Ground airplanes with defective equipment 3: Make the airplane companies pay for the spectrum that their defective equipment needs to operate.
Option 2 would satisfy flying safely and not put externalities on companies that had no fault in this. 3 also would but would not be very efficient.
No they didn't. The equipment worked just fine until people started broadcasting on a nearby frequency.
Like if I put a jammer outside your living room window and your WiFi stopped working, would that be because you bought 'defective equipment'? After all, your router doesn't have the latest 'anti-jamming' error correcting codes built in.
A jammer is a malicious, unlicensed product specifically designed to prevent your Wifi from working.
Regardless of what the specifications say, you can't rollout new technology without taking the real world parameters into account, and these were well-known parameters before anything rolled out.
From their perspective it worked for decades and now someone decide to jam it.
From engineering perspective, yes, they are defective and don't have enough filtering on the input to stay within its band