Aaron Ximm wrote:
> In my limited DAT field use, I have used ONLY DDS tapes with no problems.
> The Oade brothers I think used to say that the data-grade tapes were
> quality checked to a *higher* standard than the audio ones.
There's been arguments about whether the oxide formulation differes between
DAT (audio) and DDS (data). My guess is that it all comes off the same
line. One difference is that DDS has special leaders to identify which
kind of DDS tape it is (DDS-1, DDS-2, etc. and the lenght). Audio DAT
stopped evolving earlier than DDS. It's also likely that the price
difference is just volume (way more DDS tape sold), although there's
been discussion of some industry tax.
> The one warning I remember was to stick to the shorter tape lengths, as
> the longer ones could be thinner and hence less robust tape...
Thinner and therefore stretchier, so the tensioning, which is
controlled by torque to the hub and which varies with the diameter
of tape on the hubs. If the tape stretches wrong over the heads,
then the distance between tracks can be wrong leading to
problems playing the tape on a different deck. Also with
tapes longer than 60 meters, Sony DAT decks get very confused
about where on the tape they are when fast-forwarding over
unrecorded sections (so-called "unpacking").
-- Mike
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>From Tue Mar 8 18:27:29 2005
Message: 5
Date: Mon, 27 Sep 2004 13:16:18 -0400
From: Steve Pelikan <>
Subject: Re: Higher frequency recording
Yes, in typing my previous post I doubled 96 correctly in my head and typed
it wrong. Sorry!
A related question is whether anyone has designed/built a power supply and
preamp that can be used with ultasonic transducers of the sort sold for
applications like rangefinding. Some of these have responses across the
30-50 KHz range.
Not as an add or endorsement, but the kind of item I'm thinking about is
described in the data sheets for air ultrasonic devices at
http://www.massa.com/.
I read somewhere that frequency range of some of these devices can be
broadened by adding an appropriate resistor at an appropriate place, and
this seems to be reflected in the plots on some of the datasheets.
Thanks for info/suggestions,
Steve P
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"Microphones are not ears,
Loudspeakers are not birds,
A listening room is not nature."
Klas Strandberg
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