Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!unmvax!ncar!ames!oliveb!pyramid!decwrl!labrea!glacier!jbn
From: jbn@glacier.STANFORD.EDU (John B. Nagle)
Newsgroups: sci.electronics
Subject: Re: HELP:  FM Recording of 300-3KHz channels on 50 KHz tape deck
Message-ID: <18062@glacier.STANFORD.EDU>
Date: 30 Jan 89 17:37:09 GMT
References: <15020@oberon.USC.EDU>
Reply-To: jbn@glacier.UUCP (John B. Nagle)
Organization: Stanford University
Lines: 24


      If you're grimly determined to do this by analog means, you might
check out some of the newer parts intended for compatibility with older
frequency-division multiplexing telephone carrier systems.  These systems
are designed to compress voice channels, which are about the bandwidth
you need, into a bigger chunk of bandwidth.  Motorola and Rockwell have
telecom products catalogs that might be helpful.  

      Then, of course, there's the approach of digitizing everything and
recording the result in a computer.  There are data acquisition boards
available for this sort of thing from many sources.  The VMEbus Buyer's
Guide shows various suitable boards with up to 64 input channels.
You could probably put together a working system just by buying and
plugging in VMEbus boards.  Assuming that the goal is to get the data
into a computer for reduction, rather than generating miles of chart
recorder paper, this is probably the way to go.

      It is possible to hook a data acquisition board to a PC, and you
could certaintly record a few channels that way, but you might have trouble
getting the bandwidth for a few dozen channels.  But it's worth looking
into.  

					John Nagle