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VK7AX > WIA 12.04.14 00:53l 57 Lines 2408 Bytes #999 (0) @ WW
BID : 32653-VK7AX
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Subj: [WIA-News] Amateur Radio-Developed Software Assisting in Sea
Path: IZ3LSV<IK2XDE<DB0RES<PI8CDR<GB7YEW<VE2PKT<VK2DOT<VK7AX
Sent: 140411/2350Z 32653@VK7AX.#ULV.TAS.AUS.OC [Ulverstone] FBB7.00g $:32653-VK
From: VK7AX@VK7AX.#ULV.TAS.AUS.OC
To : WIA@WW
liner
Amateur Radio-Developed Software Assisting in Search for Missing Airliner
Date : 11 / 04 / 2014
Author : ARRL
US Navy personnel helping to look for missing Malaysia Air Flight MH370
have used the signal-processing and analysis package Spectrum Laboratory
by Wolf Buescher, DL4YHF, to analyze recently detected 37.5 kHz "pings"
that may be from the missing plane's "black box."
Some Spectrum Laboratory screen shots as seen aboard the Australian
defense vessel Ocean Shield were shown on TV in Australia and in the UK.
The US Navy personnel are guests aboard the Australian ship.
VLF experimenter Warren Ziegler, K2ORS, said the software is the same
package Amateur Radio experimenters used recently to detect transatlantic
signals on 29 kHz.
More info via this Link >
http://www.arrl.org/news/hams-experimental-vlf-signals-heard-in-the-uk-europe
"Wolf's package is first-rate software, and I know that there have been
other professional uses, but this was quite an interesting one!" Ziegler said.
The software began as a simple DOS-based FFT program, but it is now a
specialized audio analyzer, filter, frequency converter, hum filter,
data logger, and more.
It's available for download from DL4YHF's Amateur Radio Software site.
Link > http://www.arrl.org/news/hams-experimental-vlf-signals-heard-in-the-uk-europe
Buescher said he was skeptical about the initial "ping" detection by a
Chinese search vessel, but later called the spectrogram taken by the US
team aboard Ocean Shield "convincing." He said a screenshot from
Australian TV clearly shows the "bip-bip-bip" ultrasonic bursts or pings,
"just as they should look," he said, rather than a "just a wobbly carrier
that comes and goes."
"In slow-CW terms, it would be an 'outstanding signal.'" Buescher said.
"Now keeping fingers crossed that the ["black box"] batteries last a bit
longer than specified.
The experts say the pinger's battery usually degrades slowly,
instead of going QRT abruptly."
At mid-week, searchers had detected additional, more promising pings that
appeared to conform to the pattern of those expected from
an aircraft black box.
http://www.wia.org.au/newsevents/news/2014/20140411-1/index.php
(Sourced from the WIA Website)
(Posted to the Packet Radio Network courtesy Tony VK7AX)
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