[RFI] Fw: cell phone interference on airplanes

[Darrel Swenson]

>> Would someone in the know explain why technically the cell phones in the
headrest(Verizon?) Airphones don't cause the same problems as customer owned
cell phones.

>3) Choice of frequency bands that do not conflict with COMM or NAV
receivers

Just to set the record straight...

'A' band cellular operates from:
   824 to 835 MHz uplink (mobile to cell site)
   896 to 880 MHz downlink (cell site to mobile)

'B' band cellular operates from
   835 to 849 MHz uplink (mobile to cell site)
   880 to 894 MHz downlink (cell site to mobile)

"Airphone" operates from 849 to 851 and 894 to 896 MHz...

Same band, same propagation characteristics, same intermod potential...  The
band was originally referred to as the "cellular expansion band".  GTE
acquired exclusive rights to use it, and sold to Verizon.

Darrel Swenson, K0AWB