On Fri, 2 Jul 2004 15:21:22 +0000 (UTC), Harry Whitfield
wrote:

Well, I didn't actually forget - I thought you would know the impedance
of the type F phones. (-:

They appear to be two 2000 ohm earpieces in series, so the impedance is
presumably 4000 ohm.

The DC resistance is 3860 ohm.

I was on the limits of my generator's 50dB attenuation and on the
limits of my voltmeter, so the threshold values are likely to be very
approximate.

We are in the region of 250 pW !

Which is spot on to
a quiet whisper = 6 femtoWatts per cM²

conversation at 1M = 1 nanoWatt per cM²


Hi Harry,

You will have to forgive our Brit, computation is a trial, nailing
down specifics difficult, and hearing is not what it used to be.
None of this is terribly difficult, so I am sure Reggie anticipated
your answer, but simply out of Trollish behavior, he prefers to play
naif (a bit beyond the pale at his age however). This is all, of
course, to escape attribution for his intellectual sources for his
upcoming software :-P

You are welcome Punchinello, even if do you rustle this next release's
code under your apron to hide your plagiarism from view.

73's
Richard Clark, KB7QHC