credible to me because of the equipment they were using and highly possible they were doing some testing on the pinger. i didn t give that a lot of credibility. now we got it from this machine from that pinger locator i m very confident. david, even though the frequency that they heard was slightly different than the normal frequency for these? well, yeah. remember that there are 37.5, but even at manufactured they have a tolerance level of one frequency, one kilohertz. so, we got that to think about. in addition as the battery gets lower its potential, has potential for reducing the frequency sound as it relates to the decibels, 160 decibels but as they decrease, they can actually play with the frequency that comes off of it. there s just nothing in that range especially something that would be clicking every second
shallow water. but they are designed to function in water as deep as 20,000 feet. but what about the frequency? crews at sea picked up a slightly lower frequency than the pinger s stt frequency of 37.kilo hertz. they said water temperature can shift the frequency. it s so distinct, right? there s nothing else that would sound like this with this frequency? the 37.5 killo hertz was selected because of the background noise in the ocean. reporter: randi kaye, cnn, sarasota, florida. coming up, look at this. live pictures out of an aviation accident lab in california where they investigate airline crashes. so if flight 370 is ever found, what can experts learn examining pieces of the plane. we ll explore that coming up. qu, how much money do you think you ll need when you retire? then we gave each person a ribbon
now we got it from this machine from that pinger locator i m very confident. david, even though the frequency that they heard was slightly different than the normal frequency for these? well, yeah. remember that there are 37.5, but even at manufactured they have a tolerance level of one frequency, one kilohertz. so, we got that to think about. in addition as the battery gets lower its potential, has potential for reducing the frequency sound as it relates to the decibels, 160 decibels but as they decrease, they can actually play with the frequency that comes off of it. there s just nothing in that range especially something that would be clicking every second library that. just nothing in the natural environment that would create anything even similar to that. david gallow, let s assume
signals. as i said no luck so far. this is really critical to this search effort. they are trying to narrow down this potential search field, and they need a third signal, they say, in order to be able to do that. row mary? erin, what are we to make of the fact that the signal detected by the u.s. pinger locater you not the standard beacon frequency and what are authorities saying about that? that s right. the frequency detected was 33.2 expected as 37.5 kilohertz. angus houston was asked about that in the press conference earlier. he responded by saying the manufacturer says the findings are consistent with what we would expect from a black box pinger given the fact they are deep waters, 2.8 miles deep, as well as the fact that temperature could be a factor. the battery life also a factor.
to obtain from the two earlier acoustic events, well, that search area s too broad. if they had deployed an underwater vehicle right now to try and find this wreckage, well, the search would take many, many, many days. john? it s still too big. they do need to narrow it down. erin, tell me about the difference between signal strength that they detected when they were hearing pings. what does that indicate? reporter: that s right, john, we saw some video of that detection released today, that 33.2 kilohertz is the strength of the signal they detected on board the ocean shield. the signal should have been 37.5 kilohertz, but the manufacturer of the black box pinger saying that it s entirely possible that the signal strength could have been weakened, given any number of variables in an ocean with depths of 2.8 miles that they re looking at, things like