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| 5G versus commercial aircraft Radio Altimeters in the US, wtf? |
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| ve7xen:
It appears that not only is receiver desense due to adjacent power potentially a problem, spurious emissions from the 5G equipment are likely a problem as well, which is a lot more difficult to deal with than 'slap more filters on it'. Filtering is also not free, and will have an insertion loss cost, which will reduce sensitivity, and might then require more TX power to recover the SNR in such a sensitive system like a radar, and at that point you're redesigning the whole system. So, since this is aviation, you're talking about decades to get it implemented. The report this article is based on is here: https://www.rtca.org/wp-content/uploads/2020/10/SC-239-5G-Interference-Assessment-Report_274-20-PMC-2073_accepted_changes.pdf and it is, IMO, quite comprehensive and models base station spurious and fundamental emissions, as well as those of phones that may be present on the ground or in the aircraft. It seems likely to me that these bands will not be used near airports for these reasons. --- Quote ---And not to trigger polemics, but it just looks like the FDA these days. As soon as big money is involved, they seem to be getting suddenly blind. Or something. --- End quote --- "Regulatory Capture". Same thing with the FAA that indirectly lead to the 737MAX debacle. |
| SiliconWizard:
--- Quote from: ve7xen on January 18, 2022, 07:58:45 pm ---It appears that not only is receiver desense due to adjacent power potentially a problem, spurious emissions from the 5G equipment are likely a problem as well, which is a lot more difficult to deal with than 'slap more filters on it'. Filtering is also not free, and will have an insertion loss cost, which will reduce sensitivity, and might then require more TX power to recover the SNR in such a sensitive system like a radar, and at that point you're redesigning the whole system. So, since this is aviation, you're talking about decades to get it implemented. --- End quote --- Yes. And people saying that they could just have anticipated future evolutions? :-DD So what's gonna happen with 6G, which is coming? Most EMC standards still do not consider anything above 6 GHz. (IEC 61000-4-3...) |
| Ed.Kloonk:
--- Quote from: SiliconWizard on January 18, 2022, 07:14:25 pm --- --- Quote from: Gyro on January 18, 2022, 07:03:56 pm --- --- Quote ---Yep. This was discussed in another thread already. (In the Dodgy tech section?) --- End quote --- Sorry, I must have missed that one. Edit: I guess it must be getting mainstream media coverage now because it's one minute to midnight! --- End quote --- It was there: https://www.eevblog.com/forum/chat/faa-statement-on-5g but I think there were a couple others too. (Media coverage has its own agenda, so it's hard to conclude anything much out of it.) --- End quote --- Well, it doesn't help that the airlines all chase cheap seat ticket prices in a race to the bottom and when something bad happens they scream bloody murder. |
| Homer J Simpson:
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| Stray Electron:
The news this evening says that they've known about this problem for over two years. I suspect that it's been far longer than that. It all seems like the FAA and the FCC are both determined to be the final authority in this matter and neither one is willing to bend or to fix the problem. And in the meantime, the big cell phone companies are still determined to roll out their highly profitably 5G sham. The news also says that only 40% of the aircraft radio altimeters have been tested and are known to be safe with 5G. And at the same time, the cell phone companies are now telling the US public that they're already using 5G in 40 other countries, and implying that it's safe. What they're not telling the public is how many of those countries have any air traffic! And they're also not telling the public that the 5G power levels in the US will be more than twice the level allowed in Europe and in other countries! I wonder what's going to happen when the first airplane crashes in the US and the authorities even suspect that 5G was the cause??? I foresee the 5G system getting shutdown totally and a lot of wankers will suddenly lose ALL of their cell phone toys! |
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