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From: prophet@umcp-cs.UUCP
Newsgroups: net.audio
Subject: Bias Adjustment in Cassette Decks
Message-ID: <6062@umcp-cs.UUCP>
Date: Wed, 21-Mar-84 18:43:44 EST
Article-I.D.: umcp-cs.6062
Posted: Wed Mar 21 18:43:44 1984
Date-Received: Fri, 23-Mar-84 07:11:43 EST
Organization: Univ. of Maryland, Computer Science Dept.
Lines: 23


I have a three-head tape deck with a bias-fine-tune control.  Before recording
a tape, I tune my receiver to a spot  on  the  FM  dial  where  there  are  no
stations (just a lot of hiss) and then I use the monitor  switch  on  the tape
deck to switch between 'TAPE' and 'SOURCE' while recording the hiss.  This al-
lows me to compare the hiss a split-second before it  is  recorded  with   the
sound after it has been recorded.  I turn  the  fine-bias-adjustment   control
until the sound is the same when switching between  'TAPE'  and  'SOURCE'.  My
question is, should this procedure be done with Dolby off, or on? (I use Dolby
C)  It seems to make quite a bit of difference.  Does anyone know which way is
correct?  Can anyone suggest a more precise method of adjusting the bias with-
out using lots of expensive equipment?  Having a technician do  this  for  one
brand of tape won't work since I use many different brands of tape.

                       Thanks,
                       Dennis


-- 
Call-Me:   Dennis Gibbs, Univ. of Md. Comp. Sci. Center.
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