Acceptable registrations in the queue through May 6 at 7:00p ET have now been activated. Enjoy! -M.W.
Terms of Use have been amended effective October 6, 2019. Make sure you are aware of the new rules! Please visit this thread for details: https://www.mibuzzboard.com/phpBB3/view ... 16&t=48619
Terms of Use have been amended effective October 6, 2019. Make sure you are aware of the new rules! Please visit this thread for details: https://www.mibuzzboard.com/phpBB3/view ... 16&t=48619
List Of Airports Requiring 5G Buffer Zone
List Of Airports Requiring 5G Buffer Zone
Interference to Aeronautical Communications being reviewed.
DTW and FNT in Michigan. ORD (Hub) near Michigan.
https://www.faa.gov/sites/faa.gov/files ... Buffer.pdf
DTW and FNT in Michigan. ORD (Hub) near Michigan.
https://www.faa.gov/sites/faa.gov/files ... Buffer.pdf
"I had a job for a while as an announcer at WWV but I finally quit, because I couldn't stand the hours."
-Author Unknown
-Author Unknown
- MWmetalhead
- Site Admin
- Posts: 12169
- Joined: Sun Oct 31, 2004 11:23 am
Re: List Of Airports Requiring 5G Buffer Zone
I thought most airport communications occurred in the 108 MHz to 136 MHz band? Has that changed?
5G wireless communications occur across multiple different segments of bandwidth with a very wide variation of frequency ranges. Does the buffer affect all 5G spectrum or only portions of it?
My childhood home frequently had air traffic flying overhead or nearly overhead, often on approach to GRR. Believe it or not, I used to receive periodic interference from aircraft while listening to FM radio on a boombox. Strong local signals would never succumb to it, but weaker ones (such as WSNX) sometimes would.
5G wireless communications occur across multiple different segments of bandwidth with a very wide variation of frequency ranges. Does the buffer affect all 5G spectrum or only portions of it?
My childhood home frequently had air traffic flying overhead or nearly overhead, often on approach to GRR. Believe it or not, I used to receive periodic interference from aircraft while listening to FM radio on a boombox. Strong local signals would never succumb to it, but weaker ones (such as WSNX) sometimes would.
Morgan Wallen is a piece of garbage.
Re: List Of Airports Requiring 5G Buffer Zone
I was looking at the radios in a K Mart, the 9/27 runway's length Northeast of FNT. While I was there, one of the radios was interrupted by voice communications from an airplane or airport. The image of 108-136 MHz is 86.6-114.6 MHz on a radio with a 10.7 MHz IF. So it could be anywhere in the FM Band. The oscillator from an FM Radio ranges from 98.7 to 118.7 MHz, which it why it can interfere with Aeronautical radio communications. This is why you aren't supposed to listen to FM radios on an airplane.
"I had a job for a while as an announcer at WWV but I finally quit, because I couldn't stand the hours."
-Author Unknown
-Author Unknown
Re: List Of Airports Requiring 5G Buffer Zone
It's not the audio communications they're worried about.MWmetalhead wrote: ↑Sat Jan 15, 2022 8:14 amI thought most airport communications occurred in the 108 MHz to 136 MHz band? Has that changed?
5G wireless communications occur across multiple different segments of bandwidth with a very wide variation of frequency ranges. Does the buffer affect all 5G spectrum or only portions of it?
My childhood home frequently had air traffic flying overhead or nearly overhead, often on approach to GRR. Believe it or not, I used to receive periodic interference from aircraft while listening to FM radio on a boombox. Strong local signals would never succumb to it, but weaker ones (such as WSNX) sometimes would.
It's the 3.7 to 4.4 GHz area. Part of this is allocated to 5G carriers (3.7 to 3.98) and part is used by the radar altimeters for aircraft (4.2 to 4.2 GHz). It sounds like some of the radar altimeters are affected when the 5G systems are running in close proximity and using the 3.7 to 3.98 spectrum. The radar altimeter signals are also used on some aircraft (787s included) to trigger the engine and braking system to transition into a "landing mode" and that potentially could be affected as well.
- MWmetalhead
- Site Admin
- Posts: 12169
- Joined: Sun Oct 31, 2004 11:23 am
Re: List Of Airports Requiring 5G Buffer Zone
Great explanations; thank you both for the info!
Morgan Wallen is a piece of garbage.
Re: List Of Airports Requiring 5G Buffer Zone
At first I thought Homeland security was going to try to ban the use of cellphones in or near airports !!!!
There is lots of other radio comms outside of the direct airport ATC comms (108-136 mHz) on vhf and uhf and 800-900 mHz for other business operating on or near aiprort property !! LOTS of it.
Been-there-done-that work on those radio systems...
There is lots of other radio comms outside of the direct airport ATC comms (108-136 mHz) on vhf and uhf and 800-900 mHz for other business operating on or near aiprort property !! LOTS of it.
Been-there-done-that work on those radio systems...
Re: List Of Airports Requiring 5G Buffer Zone
From a pilot-friend who stumbled on this in a discussion about why the USA situation is different than, say, Europe:
-
- Posts: 358
- Joined: Fri Nov 13, 2015 10:53 am
- Location: Fishing somewhere
Re: List Of Airports Requiring 5G Buffer Zone
I'm surprised 5G (or any cell) transmitters are that high in output wattage. Am I mistaken believing that the devices they communicate with are no more than 3W depending on proximity?
- audiophile
- Posts: 8604
- Joined: Sat Dec 04, 2004 9:21 pm
- Location: Between 88 and 108 MHz.
Re: List Of Airports Requiring 5G Buffer Zone
5G signals at 3.9 GHz are severely attenuated by anything.
Ask not what your country can do FOR you; ask what they are about to do TO YOU!!
- audiophile
- Posts: 8604
- Joined: Sat Dec 04, 2004 9:21 pm
- Location: Between 88 and 108 MHz.
Re: List Of Airports Requiring 5G Buffer Zone
Ask not what your country can do FOR you; ask what they are about to do TO YOU!!
Re: List Of Airports Requiring 5G Buffer Zone
[
[/quote]
I'm surprised 5G (or any cell) transmitters are that high in output wattage. Am I mistaken believing that the devices they communicate with are no more than 3W depending on proximity?
[/quote]
The wattage listed is probably max E.R.P. where the highly directional antenna has a LOT of GAIN in a particular direction and that multiplies the transmitter wattage that reaches the antenna feedpoint. Say if I have 10 w output (-3dB feedline loss) and the antenna gain is 20 dB, the E.R.P . in the favored direction or plane would be 500 W !
[/quote]
I'm surprised 5G (or any cell) transmitters are that high in output wattage. Am I mistaken believing that the devices they communicate with are no more than 3W depending on proximity?
[/quote]
The wattage listed is probably max E.R.P. where the highly directional antenna has a LOT of GAIN in a particular direction and that multiplies the transmitter wattage that reaches the antenna feedpoint. Say if I have 10 w output (-3dB feedline loss) and the antenna gain is 20 dB, the E.R.P . in the favored direction or plane would be 500 W !
Re: List Of Airports Requiring 5G Buffer Zone
The graph I saw on TV basically showed that NONE of these services had any kind of a decent FILTER to keep their signal in their own band, since 5G is the last to the party, they should be forced to have a narrow cavity filter to keep their signal the hell out of the aircraft altimeters. Likewise, some 5G is blowing into SiriusXM units when in close proximity to their 30'-40' little mini-towers. My SXM will read "NO SIGNAL" until I get a block away from it. Again, I think that the incumbents should be protected and the heavy filtering is the responsibility of the new 5G offenders. Also, is the reason broadcast radio lost their network satellite band is also for 5G? And we lost 1/3 of the GD TV band? Seems like too high of a price to pay for a service that not all of us are going to use, unless they decide to drop 3G and 4G/LTE and force customers into 5G or nothing? I'd like to say nothing. Screw the cellphone companies...their damn 3W 'AMPS' analog cellphones had spectacular quality, used what, a 30KHz bandwidth? Damn they sounded good in 1993.