5 ms·
What's different in the US from the rest of the world that's been running 5G for a while?
by trebligdivad 5y ago
What's different in the US from the rest of the world that's been running 5G for a while?
- thetinguy 5y ago5g has been running for a couple of years in the US. The FAA’s problem is new spectrum that carriers want to deploy.
- huslage 5y agoThey have deployed it, it's just not turned on yet.
- londons_explore 5y agoDifferent countries use different frequency bands for both 5G and radar alitmeters. The FAA's concern here is that the bands will be neighbouring in the USA, which means if either the 5G equipment accidentally transmits a bit of signal outside its allocated band, or the altimeters accidentally interpret out-of-band signals they ought to ignore, then problems could happen. Since radar altimeters are pretty old tech, and very analogue, their concern isn't totally unwarranted.
- trebligdivad 5y agoThanks; so then the question is hth did the US manage to do this 5G allocation without thinking about the consequence?
- bdamm 5y agoFAA is actually quite good at ignoring theoretical non-problems. This is a sample notam for what the anti-interference alert will look like.
- NavinF 5y agoThe bands seem to be 200mhz apart, which is a massive gap. If it was my decision, I wouldn’t think of any consequences. I still think this will only affect the crappiest of hardware with the crappiest of filters.
- hokumguru 5y agoMost people don't realize that the vast majority of GA aircraft are positively ancient though. When the average hardware among hobbyists is >30 years old the definition of "crappiest of hardware" takes on a different meaning.
- huslage 5y agoThere are no ancient GA aircraft with RADALTS or autoland systems.
- slackfan 5y agoConsidering that Garmin sells a full kit that integrates wit their displays (https://www.garmin.com/en-US/p/135561 https://www.garmin.com/en-US/p/135561), and autoland systems are just becoming available, I think you're incorrect in your assumptions.
- throwawayboise 5y agoMany GA airframes are old, but have been refitted with "glass cockpits" from Garmin or other avionics companies.
- p_l 5y agoa single radar altimeter's operating bandwidth can be as high as 200MHz, though (In fact, higher bandwidth increases resolution and quality of return)
- NavinF 5y agoThat has nothing to do with the frequency allocation. You can’t just transmit outside your band hoping it will increase resolution. And receiving 200mhz outside your band is not a thing we do in <current century>. DSP exists.