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G8MNY  > TECH     07.05.26 17:31l 44 Lines 1573 Bytes #6 (0) @ WW
BID : 59097_GB7CIP
Read: GUEST
Subj: AF Standing Waves
Path: JH4XSY<N3HYM<GB7YEW<GB7CIP
Sent: 260507/0825Z @:GB7CIP.#32.GBR.EURO #:59097 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To  : TECH@WW

By G8MNY                               (New Apr 17)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)

While laying around for a week in Hospital and a noisy night time drug pump
Alarm on the adjacent bed, I found myself playing sound games when I could
not sleep.

   ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ
   ｳ               Bed               ｳ
   ｳBedｱｱｱｱ         ｱｱ        ｱｱｱｱBedｳ
   ｳ                ｱｱ               ｳ________
   ｳ                                   Corridor
   ｳ                                  ________
   ｳ  ｱｱ            ｱｱ           ｱｱ  ｳ
   ｳ  ｱｱ []         ｱｱ           ｱｱ  ｳ
   ｳ  Bed Alarm     Me          Bed  ｳ
   ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ

I was in the middle of a 6 bed ward. The alarm was a loud pure note (1.5kHz?)
and I found with my head on one side and moving just a few mm, I could get a
VERY deep nulls (60dB) in the tone from the reflections bouncing up & down the
room.

   |  _    _    _    _    _    _    _    _  |
   | / \  / \  / \  / \  / \  / \  / \  / \ |
   |/   \/   \/   \/   \/   \/   \/   \/   \|
   |       ｳ            ｳ                   |
 Wall    Alarm        Nulls               Wall

Then when the nurse approached from the corridor, I could detect this with the
standing wave reflections were being disturbed. This gave a loud multiple
Doppler ping sounds for each node the nurse went through.


All quiet interesting when you have nothing else to do in Hospital at night!


Why don't U send an interesting bul?

73 De John, G8MNY @ GB7CIP


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