golftango From United States of America, joined Feb 2006, 316 posts, RR: 0 Posted (5 years 7 months 2 weeks 2 days 11 hours ago) and read 5065 times:
Today while monitoring the JFK tower on LiveATC (excellent app for the iPhone!) a departing DL had the annoying "buzz/interference" from a GSM cell's pulse rate on their radio. The interference was heavy and continued as they acknowledged the hand off to departure. It was pretty obvious that one of the crew had his/her cell phones on while in flight. Is it common for the crew to keep their cell phones on?
FLY2HMO From , joined Dec 1969, posts, RR:
Reply 4, posted (5 years 7 months 2 weeks 2 days 11 hours ago) and read 5025 times:
Quoting golftango (Reply 2): No - iPhone has no GSM pulsing. Again, I was listening to ATC ON my phone.
GSM phones do it too. Get it on my computers speakers all the time with both CDMA and GSM phones, even by my friend's iphone.
Quoting golftango (Reply 2): The phone has to be in close proximity to get interference, had to have been crew.
Not necessarily. On a good day if I leave my phone in the bathroom I'll hear the pinging on my PC's speakers. Yes they do tend to be very sensitive to that but it goes to show the phone does not have to be right next to any other apparatus to cause interference.
Starlionblue From Greenland, joined Feb 2004, 17380 posts, RR: 66
Reply 5, posted (5 years 7 months 2 weeks 2 days 9 hours ago) and read 4955 times:
To answer your question, it is not common for the crew to leave their phones on. It is probably against regs. However as mentioned above, someone probably just forgot. Could be crew or pax. It happens every day. I bet there's a cell phone on pretty much on every flight.
The antennas aren't the problem...your PC speakers pick up cell phone interference just fine and they don't have any (designed) antenna at all. The audible frequency side-band transmissions from cell phones can be picked up by wires all over the place...and airplanes are stuffed full of wires. So all it takes is proximity and/or power between the transmitter and *any* wire that connects to the communication system. It could be a passenger anywhere in the aircraft, or someone's phone in their luggage that they forgot to turn off, or...
rolypolyman From United States of America, joined Mar 2009, 160 posts, RR: 0
Reply 10, posted (5 years 7 months 2 weeks 1 day 4 hours ago) and read 4556 times:
It could have also been someone with a cell phone near the LiveATC receiver. For example, if the cell interference was faint and there was no radio transmission, the receiver squelch would not be tripped and you wouldn't hear it. But when the aircrew transmits, it produces just enough RF energy to trip the squelch, and then the interference at the receiver site is heard, too.
GoBoeing From United States of America, joined Jun 2000, 2792 posts, RR: 14
Reply 11, posted (5 years 7 months 2 weeks 1 day 1 hour ago) and read 4501 times:
Just to agree with the other post on here, it can definitely be from someone in the cabin or a flight attendant in the jumpseat. I had it happen once where I was sure it was me or the other pilot as usual, forgetting to turn ours off, and ours were both off. Also could be a jumpseater in the cockpit. You get the idea.
I once called a friend... normally call 30 mins after his scheduled arrival time... he rejected the call and 1 minute later I received a text message: "AH F*** AM@8000 ONDES ### CRPPY WX. WILL CALL EST 0045 FRM NOW" (### the VOR over the field)
Apparently he forgot to switch his cellphone off... he forgets on his bad days...
The last time I received a text in cruise was during a single engine descent on a flight with multiple problems... mind you, I had a pax receiving a call at FL220...
When losing situational awareness, pray Cumulus Granitus isn't nearby !