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G8MNY > TECH 26.05.20 09:56l 43 Lines 1640 Bytes #999 (0) @ WW
BID : 57517_GB7CIP
Read: DJ6UX DF7EAV GUEST OE7FMI
Subj: AF Standing Waves
Path: DB0FHN<DB0RBS<DB0ERF<DB0RES<ON0AR<OZ5BBS<CX2SA<N9PMO<GB7YEW<GB7COW<
GB7CIP
Sent: 200526/0848Z @:GB7CIP.#32.GBR.EURO #:57517 [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 & a noisy night time drug pump Alarm
on the adjacent bed, I found myself playing sound games when I could not sleep.
ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
³ Bed ³
³Bed±±±± ±±± ±±±±Bed³
³ ±±± ³________
³
³ Corridor
³ ________
³ ±±± ±±± ±±± ³
³ ±±± [] ±±± ±±± ³
³ Bed Alarm Me Bed ³
ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
I was in the middle of a 6 bed ward. The alarm was a loud pure note (1.5kHz?)
& I found with my head on one side & moving just a few mm, I could get a VERY
deep nulls (60dB) in the tone from the reflections bouncing up & down the room.
| _ _ _ _ _ _ _ _ |
| / \ / \ / \ / \ / \ / \ / \ / \ |
|/ \/ \/ \/ \/ \/ \/ \/ \|
| ³ ³ |
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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