Boeing, Airbus executives urge delay in U.S. 5G wireless deployment

Re:Boeing, Airbus executives urge delay in U.S. 5G wireless ... by p_l on Wednesday December 22, 2021 @02:48PM (#29654123)

Radio altimeters have bandwidth as high as 170MHz, and a lot of work goes into ensuring other devices in 4.2-4.4 band do not interfere with them.

The fact that certain radio systems can utilize low bandwidth does not mean every system is like them.

[ Parent | on HN ]

Re:Boeing, Airbus executives urge delay in U.S. 5G wireless ... by onphonenow on Wednesday December 22, 2021 @03:44PM (#29654913)

Are you sure? That's an almost impossibly high receive bandwidth for an older type of equipment I would think.

I've seen bandwidth ranges of 50Hz to 300Hz (that's Hz not KHz or MHz). This is swept or chirped over a frequency (bigger is better for that - so 200Mhz good and they'd probably want more).

But in terms of a guard, you should be able to guard much tighter than 200Mhz - that's what I'm not understanding - but haven't looked at it closely.

[ Parent | on HN ]

Re:Boeing, Airbus executives urge delay in U.S. 5G wireless ... by p_l on Wednesday December 22, 2021 @04:25PM (#29655478)

Frequency Modulated Continuous Wave radars used for most civilian radar altimeters sweep most of 200 MHz bandwidth, largest known case is 196 MHz. Transmit power ranges between 0.1 to 100W.[1]

As another commenter mentioned, making a broadband filter for such wide bandwidth is... problematic, and it's one of those devices where you might want to use fixed function rather than SDR.

[1] https://www.icao.int/NACC/Documents/Meetings/2018/RPG/RPGITU...

[ Parent | on HN ]