[Vintage-Audio] Re Teac FM Copy

Tue Jun 18 22:52:01 2002

This unit has Dolby in/out on a separate switch. 	

Duane W8DBF	

----------
From: Robert  J.  McKee <[email protected]>
To: [email protected]
Subject: Re: [Vintage-Audio] Re Teac FM Copy
Date: Tuesday, June 18, 2002 10:22 PM

Shot in the dark... self erasure, reducing highs minimizing
the effect.
Remember this is what Dolby HX is doing on a cassette.
Bob

----- Original Message -----
From: Allen, KJ6XH <[email protected]>
To: <[email protected]>
Sent: Tuesday, June 18, 2002 9:58 PM
Subject: Re: [Vintage-Audio] Re Teac FM Copy

> Bob and group,
>
> Yes, I'm beginning to remember more.
> It's true we didn't want this interactiom. And, I do recall
the problem.
>
> But, *why* would Duane's "FM copy" switch *increase* the
hi-freq
> content?
> This one I can't quite get a handle on!
>
> Allen
>
> "Robert J. McKee" wrote:
>
> > Sorry, no better ideas, but one of the functions of the
high
> > filter
> > for recording FM MPX broadcasts was to prevent interaction
of
> > the 19 KHz with the AC bias frequency producing audible
beats.
> > Bob (new to your list) McKee
> >
> > ----- Original Message -----
> > From: Allen, KJ6XH <[email protected]>
> > To: <[email protected]>
> > Sent: Tuesday, June 18, 2002 9:07 PM
> > Subject: Re: [Vintage-Audio] Re Teac FM Copy
> >
> > > Hello Duane,
> > >
> > > It's been a long time. But, I have a couple of leads you
> > could check out.
> > > 1.   The "vintage" stereo receivers had a filter to
minimize
> > the 19KHc
> > > Pilot tone (that tells the receiver "this is a stereo
> > signal- not mono.
> > > The recorder switch brings-in a hi-enphasis network to
> > restore some
> > > of those lost highs.
> > >
> > > 2.   FM circuitry includes a pre (post?) emphasis
circuit to
> > keep overall
> > > freq response in proper perspective.on the receiving
end.
> > > *If* the recorder output is tapped-off prior to this
> > network,  the
> > > recorder would nead this provision to make-up for the
> > "missing" network
> > > that is in the receiver.
> > >
> > > 3.  As I recall, FM freq response was normally limited
to
> > 15KJHz on the
> > > hi end.  Perhaps the switch allows you to get some of
the
> > "shimmer" of
> > > the hi's above this point.
> > >
> > > I, myself, tend to believe the third possibility  more
than
> > the first two.
> > > But, Maybe these give you something to think about and
> > experiment with.
> > > Remember-- Most natural sound is what counts, not
> > necessarult the nrightest!
> > >
> > > Any one have better ideas?
> > >
> > > Allen
> > >
> > >
> > >
> > > "Duane Fischer, W8DBF" wrote:
> > >
> > > >
> > > >
> > > > The Teac model A-5500 has a switch marked: FM Copy
on/off.
> > What is its intended
> > > > purpose? I noticed while listening to a vinyl
recording
> > being sent through the
> > > > source in monitor mode that having this switch turned
on
> > increased the highs. I
> > > > though this curious. What is the real deal?
> > > >
> > > > Thanks.
> > > >
> > > > Duane Fischer, W8DBF
> > > > [email protected]
> > > >
> > > > _______________________________________________
> > > > Home:
> > http://mailman.qth.net/mailman/listinfo/vintage-audio
> > > > List Administrator: Duane Fischer, W8DBF
> > > > ** For Assistance: [email protected] **
> > >
> > > --
> > > 73 de Rev. Allen, KJ6XH      Real Radios glow in the
dark!
> > >         http://home.earthlink.net/~mattall
> > >
> > >        Checkout TBN on DirecTV Satellite-- channel 372
> > >             and Cable Systems all around the USA
> > >
> > >
> > > _______________________________________________
> > > Home:
http://mailman.qth.net/mailman/listinfo/vintage-audio
> > > List Administrator: Duane Fischer, W8DBF
> > > ** For Assistance: [email protected] **
> >
> > _______________________________________________
> > Home:
http://mailman.qth.net/mailman/listinfo/vintage-audio
> > List Administrator: Duane Fischer, W8DBF
> > ** For Assistance: [email protected] **
>
> --
> 73 de Rev. Allen, KJ6XH      Real Radios glow in the dark!
>         http://home.earthlink.net/~mattall
>
>        Checkout TBN on DirecTV Satellite-- channel 372
>             and Cable Systems all around the USA
>
>
> _______________________________________________
> Home: http://mailman.qth.net/mailman/listinfo/vintage-audio
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: [email protected] **

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