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No, blame the FCC for not properly clearing frequencies used by safety-critical equipment before reassigning them to 5G. They wanted to stick cellphones right n
by kmeisthax 4y ago
No, blame the FCC for not properly clearing frequencies used by safety-critical equipment before reassigning them to 5G. They wanted to stick cellphones right next to altimeters, it should be their burden to make sure all the altimeters currently deployed won't get hit with sideband noise.
The FAA's approach is reasonable because safety-critical equipment is, well, critical to safety. The FCC got rolled by the 5G hype train and failed to do its job - i.e. allocate frequencies to avoid unintended interference.
- naikrovek 4y agothere is a 220MHz buffer between the two bands. that's eleven (11) terrestrial commercial FM radio bands worth of gap. 220MHz is sufficient if your altimeter radar has the proper selectivity. ground radars are so selective that you can have two radar devices operating at the same frequency aimed at each other without interference.
- TristanBall 4y agoSorry? Would you mind explaining that for a layman? How do two devices on the same frequency, pointing at each other, not interfere?
- naikrovek 4y agobecause they look for reflected signals, which changes how the waveform is shaped, and there is circuitry which ignores unreflected inputs. additionally, the radars sweep through their bands rather than broadcast on all of it at once, so the chance of them looking for the frequency that the other radar is sending at the exact moment it is being sent is very small, and when it does happen it is easily ignored. the sweeping is what provides the ability to easily detect movement and change in distance from radar to target. this is all based on a book I read years ago, so I apologize if any of it is not exactly on the dot accurate.
- TristanBall 4y agoHey that's great, thankyou - even if it's not 100% you've given me a leg up to start looking into it further some rainy afternoon.
- DannyBee 4y agoSorry, but no. It's 220mhz away. That's insane. No properly operating equipment needs that sort of gap, and certainly not radar altimeters built with the proper selectivity. This is a 100% solved problem, and a 100% failure on the part of the equipment manufacturers, and whatever certification procedures exist for them. It simply is not that hard to test this, certify this, etc.