Ken Javor wrote:
>> ... but I wonder if the presence of even an rf emission (as contrasted to 50 Hz) should cause any problem to a land-line phone with a wired handset. It wouldn't seem likely that the power available from a couple AA batteries would be sufficient for that. Now if it were a cordless phone and there were an rf emission in band to the cordless link, that would be much more credible. << I'd lean towards a more prosaic explanation; oscillations involving the transistors which make the LED's blink. During the inevitable time in a linear region of operation while switching, they may well be oscillating at frequencies determined by the length of the wires to which they are connected. This would last only a short time, of course, but would generate a narrow RF pulse which might well be rectified in a nearby audio amplifier. Cortland This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
