[Elecraft] OT -RFI question

[Ed, W9EJB]

The major problem with the digital modes (amplitude pulse modes) occured
during the initial protocol between the cell & phone.  This is a max power
mode and occurs prior to phone ringing.  The peak powers were as high as 10
watts.  Also, during power save modes of TDMA,  the packet rate can be as
low as 2 Hz.  Any rectification in the front end of the pacemakers would see
this as a heart rate of 120 beats per minute.  This could then inhibit the
pacemaker pulses.  Fewer than 10% of pacemaker patients are fully dependent
for 100% pacing.  Therefore brief periods of inhibition would not be noticed
by most patients.  All observed forms of interference were temporary and
never caused microcode corruption or any mode or parameter changes.

All of this was solved by using miniature feedthrough capacitors and became
standard industry practice about 20 years ago.  Problems solved between cell
phones and pacemaker interference.

Ed, W9EJB

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