Originally Posted by Old Smokey
Try operating coms on 133.4 and have one of your passengers operate a "Blackberry" phone. Not strictly a mobile phone in the conventional sense, but a mobile phone on a different frequency nonetheless.
133.4 is an exact harmonic, and reception of this frequency is perfect, reception of the phone caller that is! As for ATC, you can't hear a damned thing!
Regards,
Old Smokey
Sorry, I find this a little bit difficult to believe:
1) Blackberry phones are digital, either in their GSM or iDEN versions. No conversation can be heard by a conventional analog receiver.
2) 133.4 is an exact harmonic of what? All mobile networks use multiple frequencies (channels), so unless you know which exact frequency a cellphone is using at a given time, you cannot make any assertion like that.
DISCLAIMER: before someone jumps in for the 465754th time saying "just switch it off" ..
I'M NOT ADVOCATING USE OF CELLPHONES IN FLIGHT.
Sorry for the uppercase.