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March 25th, 2006, 17:44
| #1 |
| Junior Member Join Date: Jul 2005
Posts: 75
|  Background Hum on United Radios
Has anyone else ever noticed the distinct and cool sounding hum in the background on all United Airlines transmissions? Does anyone know the reason for this? I can't figure it out because other airlines have the same aircraft with presumably the same radios... I think it sounds cool. Does anyone have an explanation? You can usually hear it here: http://audio.liveatc.net:8012/ksfo_twr.m3u |
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March 26th, 2006, 03:41
| #2 |
| Old Skool  Join Date: Apr 2005 Location: USA
Posts: 1,744
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I bet somebody at Airliners.net could tell you. Seriously. I'm not making fun of A.net. I swear. |
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March 26th, 2006, 03:54
| #3 |
| Agent Smith  |
Might be the brand of radio the airline uses.
__________________ Doug Taylor http://76school.flyblog.com (old!) http://30west.flyblog.com (updated 11/28) |
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March 26th, 2006, 12:48
| #4 |
| Junior Member  Join Date: May 2005 Location: KLUF
Posts: 132
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Could be a 60Hz hum produced by the frequency of the power supply becoming impressed onto the signal because of improper filtering or shielding...I've heard it a lot....never thought much about it
__________________ ATP, CFI, CFII, MEI, USAFR Viper IP "they come to snuff the rooster" |
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March 26th, 2006, 18:35
| #5 |
| Old Skool  Join Date: Sep 2001
Posts: 2,045
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Could also be the type of headsets the company supplies.
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March 27th, 2006, 00:06
| #6 |
| Old Skool  Join Date: Sep 2002 Location: Grand Forks, ND (UND)/ Davenport, IA
Posts: 2,204
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I think United is just cool like that. 
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March 27th, 2006, 02:56
| #7 |
| Old Skool  Join Date: Jul 2003
Posts: 2,395
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I've also heard the noise Nwa757 is talking about. On United aircraft, it is always the 757/767 and usually none others. Sometimes another airline's 757 or 767 makes the noise. I've never heard it on an Airbus or 737. To know exactly what he is talking about it's in the background of the UAL93 hijacking ATC sound clips.
__________________ Even those who arrange and design shrubberies are under considerable economic stress in this period in history. |
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March 27th, 2006, 12:06
| #8 |
| Senior Member  Join Date: Dec 2003 Location: Fresno, CA
Posts: 920
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It's the AC power hum as someone already mentioned. I've heard it on many airplanes, not just United's, and I've heard many United airplanes without the hum. What does it really mean? It means that the radio needs a new noise filter.
__________________ 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0 |
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March 27th, 2006, 14:11
| #9 |
| Senior Member  Join Date: Jul 2001 Location: Houston, TX
Posts: 1,021
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You also hear this hum on radio transmissions from some aircraft-it's the 400Hz hum from the generators/alternators. Caused by poor shielding and grounding. I even hear it on the music channels on some aircraft.
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March 27th, 2006, 21:23
| #10 | |
| Senior Member  Join Date: May 2004 Location: Boston
Posts: 616
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March 28th, 2006, 00:47
| #11 |
| Old Skool  Join Date: Sep 2001 Location: Inside your OODA loop
Posts: 7,009
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The radios in one of the 182s I fly have that hum, and believe me, it ain't so cool after a while. More like inducing one to jab icepicks into one's ears.
__________________ Commercial Pilot, ASEL/AMEL/IA 900+ TT/25 ME Mountain-qualified Search & Rescue/Disaster Relief Mission Pilot, Civil Air Patrol B.S., Psychology, Univ of Utah |
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May 29th, 2006, 10:30
| #12 |
| Newbie  Join Date: Apr 2006
Posts: 7
| Re: Background Hum on United Radios
It's 400hz AC not 60hz.
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June 3rd, 2006, 13:41
| #13 | |
| Senior Member  Join Date: Apr 2001 Location: So. California
Posts: 1,304
| Re: Background Hum on United Radios Quote:
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