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home | newest check | boards | help index | log | ps | userlogin | send sysop | slog | status forward | bcm news | users | version | remove cookieG8MNY > TECH 15.05.24 18:15l 42 Lines 1567 Bytes #10 (0) @ WW BID : 7777_GB7CIP Subj: AF Standing Waves Path: JH4XSY<IW0QNL<IZ3LSV<DB0ERF<DK0WUE<DK0WUE<VK5RSV<PI8ZTM<I0OJJ<GB7CIP Sent: 240515/0907Z @:GB7CIP.#32.GBR.EURO #:7777 [Caterham Surrey GBR] $:7777_GB 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. 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?) & 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. | _ _ _ _ _ _ _ _ | | / \ / \ / \ / \ / \ / \ / \ / \ | |/ \/ \/ \/ \/ \/ \/ \/ \| | 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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