To: | [email protected] |
---|---|
Subject: | Re: LF: SpecLab helps plane hunt |
From: | wolf_dl4yhf <[email protected]> |
Date: | Mon, 07 Apr 2014 17:44:51 +0200 |
Authentication-results: | mx.google.com; spf=neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of [email protected]) smtp.mail=[email protected] |
Delivered-to: | [email protected] |
In-reply-to: | <[email protected]> |
References: | <[email protected]> |
Reply-to: | [email protected] |
Sender: | [email protected] |
User-agent: | Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130620 Thunderbird/17.0.7 |
Hi Pete, Mike, Alan, and all,I was also sceptic about the first "detection" (by the Malaysian or was it a Chinese search vessel). But to me, the spectrograms taken by the US team aboard Ocean Shield is convincing. The screenshot at ABC is a bit blurred but one can nicely see the "bipp-bipp-bipp-..." periodic ultrasonic bursts (aka "pings"), just as they should look like: http://www.abc.net.au/news/2014-04-07/ocean-shield-detects-possible-mh370-black-box-signal/5372616It's not just a wobbly carrier that comes and goes. In slow-CW-terms, it would be an "outstanding signal". The signal is picked up by a towfish pulled on a long cable, to get away from the QRM (vessel) as far as possible. Now keeping fingers crossed that the batteries last a bit longer than specified. The experts say the pinger's battery usually degrades slowly, instead of "going QRT" abruptly. 73, Wolf DL4YHF . Am 07.04.2014 16:16, schrieb M0FMT: Hi allIf their kit is that shaky dothey understand that EM "breakthrough" into the long trailing antenna like cables from the sensors at 37.5 kHz is possible? i.e. Powerful VLF TX operating in that frequency range because of its sea penetrating properties for very purpose of communicating with submerged Naval Submarines. Or is the acoustic PING encoded to avoid this confusion?73 es GL PeteM0FMT IO91UX--------------------------------------------On Mon, 7/4/14, Mike Dennison <[email protected]> wrote:Subject: LF: SpecLab helpsplane hunt To: [email protected], [email protected] Date: Monday, 7 April, 2014, 14:15I have been amazed at thelow tech methods apparently being used inthe hunt for the 'pings' from theblack box of the missing Malaysian plane.Buttoday the BBC lunchtime news showed the Ocean Shield search ship using DL4YHF's Spectrum Laboratory, presumably with a 96kHz soundcard as its input - exactly the kit used for the recent amateurradiotransatlantic tests on 29kHz.Well done, Wolf. Yourexcellent software may help solve thismystery. de Mike,G3XDV |
<Prev in Thread] | Current Thread | [Next in Thread> |
---|---|---|
|
Previous by Date: | RE: LF: SpecLab helps plane hunt, dl4yhf |
---|---|
Next by Date: | Re: LF: SpecLab helps plane hunt, Alan Melia |
Previous by Thread: | Re: LF: SpecLab helps plane hunt, M0FMT |
Next by Thread: | RE: LF: SpecLab helps plane hunt, Rik Strobbe |
Indexes: | [Date] [Thread] [Top] [All Lists] |