[amsat-bb] Re: Explorer I - recordings
rdwelch at swbell.net
Tue Feb 5 14:37:24 PST 2008
Gosh it's been a long time since I last saw/heard you. I can't recall,
but I think initially you were still with Ma Bell weren't you? I've
been retired since 1991.
In answer to your question, I don't think any of my recordings showed
such a counter stoppage. If it did, I wasn't recording at the time.
The receiving setup was not very good for extended periods of tracking
what with a fixed antenna. I just found the old Life Magazine article
about that launch. I must have tucked it away in the bottom of the
trunk and forgotten about it.
Phil Karn wrote:
> Roy wrote:
>> I have been asked if any of the Explorer I recordings were still
>> available in WAV, etc format. There is one posted at
>> http://www.amsat.org/amsat-new/index.php. Select the "Select a Topic"
>> drop down menu and scroll down to "Sounds from the first satellites."
>> There are a few recordings there with the info about the recordings.
>> One of them is the Explorer I telemetry. You will hear several constant
>> audio tones with one of them shifting between two tones. There was a
>> geiger counter on board that counted cosmic ray particles according to
>> the info I have read. After a certain number had been counted the tone
>> shifted and after another quantity had been counted it shifted back again.
> Explorer 1 may not have been the first satellite in space, but it was the first
> to make a significant scientific discovery -- the Van Allen belts. That particle
> detector stopped reading above about 2,000 miles because it was saturated by the
> extremely high count.
> I wonder if any of these recordings show that happening.
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