PSN-L Email List Message

Subject: Re: Video cassette recorder
From: ChrisAtUpw@.......
Date: Wed, 4 Jul 2001 20:16:06 EDT


In a message dated 04/07/01, ogzax@........ writes:

>         Has anyone thought of using a VCR's audio input to record up to
> six hours of a tone modulated seismic signal ?  

Dear Casey,

       The short anwser is no. There is no reason in principle why you should 
not tackle the easier task of reducing the drive speed of conventional tape 
recorders by a factor of up to ~100 giving say lone to three day's data on 
one tape and using frequency modulation to handle the very low frequencies. 
Depends on how long a period you want to store. Even 75 cassette tapes take 
up quite significant space. Tape is not a very good medium for long term 
storage. Since you can get CDROM recordable disks which will handle a very 
wide dynamic range, is it really worth the effort?

       Regards,

       Chris Chapman
In a message dated 04/07/01, ogzax@........ writes:


  ;      Has anyone thought of using a VCR's audio input to record up to
six hours of a tone modulated seismic signal ?  


Dear Casey,

      The short anwser is no. There is no reason in principle why you should
not tackle the easier task of reducing the drive speed of conventional tape
recorders by a factor of up to ~100 giving say lone to three day's data on
one tape and using frequency modulation to handle the very low frequencies.
Depends on how long a period you want to store. Even 75 cassette tapes take
up quite significant space. Tape is not a very good medium for long term
storage. Since you can get CDROM recordable disks which will handle a very
wide dynamic range, is it really worth the effort?

      Regards,

      Chris Chapman

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Larry Cochrane <cochrane@..............>