[Vintage-Audio] Re Teac FM Copy

Tue Jun 18 22:52:00 2002

There is a separate switch for MPX in/out, so that is not the function of this
'FM Copy' 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 9:25 PM

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]
> >
> > _______________________________________________
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> > List Administrator: Duane Fischer, W8DBF
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>
> --
> 73 de Rev. Allen, KJ6XH      Real Radios glow in the dark!
>         http://home.earthlink.net/~mattall
>
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>
>
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