[s-cars] Blaupunkt MDP-01 Compatibility - NOT COMPATIBLE :-(
Paul Gailus
gailus at mindspring.com
Thu Nov 27 12:06:15 EST 2003
I agree with Kirby that the typical FM radio station
is a very poor indicator of the fidelity that the medium
is capable of providing. Last time I looked at broadcast
FM stations with an RF spectrum analyzer, most of them
seemed to occupy all of their FCC allocated bandwidth
on an almost continuous basis due to the high level of
signal compression. Classical stations were much
better.
Because of the "capture" effect in FM, the demodulated audio
S/N increases rapidly with RF signal level (carrier-to-noise)
once you get above the quieting threshold.
Linearity is really a different animal, and has more to do with
the equipment that the medium. The end-to-end linearity
of AM or FM broadcast is limited by the linearity of the
modulator, IF filtering, and demodulator chains that are used.
I highly doubt that the cheap modulators for in-car wireless
connections have very good linearity.
All this being said, I personally can't see the point of
putting a modulator and demodulator in the audio signal path
just to avoid some minor wiring.
Paul
----- Original Message -----
From: Kirby Smith <kirby.a.smith at verizon.net>
To: Jon Boultinghouse <jhboult at hotmail.com>
Cc: <s-car-list at audifans.com>
Sent: Thursday, November 27, 2003 7:30 AM
Subject: Re: [s-cars] Blaupunkt MDP-01 Compatibility - NOT COMPATIBLE :-(
> Recalling "Modulation Theory" by Black: Your FM radio sounds like crap
> because all stations except classical music stations run at 100%
> modulation using compressed dynamics. Given adequate RF signal
> strength, the S/N at the FM demodulator, and thereby dynnamic range of
> an FM signal, should be better than you can hear in a moving
> automobile. Second, the frequency response is to 15 kHz, and I doubt
> many of us can hear beyond that in a moving car. Linearity of FM can be
> excellent, given sufficient S/N.
>
> In other words, blame your modulator, or blame the FM station's
> modulator, but don't blame FM.
>
> kirby
>
> Jon Boultinghouse wrote:
> >
> > This is also a good idea... the Ipod also works with PC as well, not
just
> > Macs... the problem with FM modulators is that the sound quality will
only
> > be as good as a clear radio station.. because it is exactly that. Won't
be
> > or even MP3 quality... plus you have the alternator buzz that usually
comes
> > along with FM modulators that everyone loves so much, and you usually
have
> > to buy a filter for that... but they are cheap.. modulator for $35,
filter
> > for $10. However, hardwiring it would be easy... looks like the sound
input
> > wires have been identified, so just plug in the output wires from an
Ipod,
> > or a Nomad MP3 player (much cheaper, larger hard drives) into the CD
changer
> > outputs... then just put the head unit on the CD changer mode, and the
sound
> > will come from the MP3 player controls... you could even keep the CD
changer
> > hooked up possibly by making your own on/off switch from the changer, so
you
> > could stop the signal coming from it, and just the MP3 player... I
hooked up
> > a Sony Clie palm pilot that played MP3's and videos up to a stock head
unit
> > in an '88 mecedes 230ce 5-speed (gray market of course) it worked
perfect...
> > I for one am thinking about replacing the head unit all together, and of
> > course speakers as well, and getting a head unit that plays MP3 CD's and
XM
> > radio compatible... big bucks, but an after market system these days
will
> > out perform any '95 factory bose hands down... just hate to get rid of
that
> > factory system look... oh well, worth it, XM is great...
> > Jonny B. '95 S6 MTM1+
> >
> > >From: matt ludwig. <matt.ludwig2 at verizon.net>
> > >To: chris chambers <fastscirocco_2000 at yahoo.com>
> > >CC: TODD KRAMER <toddekramer at msn.com>,s-car-list
<s-car-list at audifans.com>
> > >Subject: Re: [s-cars] Blaupunkt MDP-01 Compatibility - NOT COMPATIBLE
:-(
> > >Date: Tue, 25 Nov 2003 12:06:16 -0500
> > >
> > >just observing this interesting thread and NOT to cast me as a
> > >disbeliever, but. . .
> > >
> > >why not just get an iPOD @ 5-10, even 15gB worth of data capacity and
use
> > >either the iTrip FM transmitter accessory or the hard-wired car dock
and
> > >call it a day? now, i am an un-apologetic apple fan and do love to see
OEM
> > >parts tuned for all they can be efficient for, but i see some serious
> > >headaches in the future to re-map the firmware of the BOSE head unit
of
> > >the s-car.
> > >
> > >probably not even $0.01 worth,
> > >
> > >matt ludwig.
> > >1995.5 s6 avant.
> > >
> > >
> > >On Nov 25, 2003, at 11:41 AM, chris chambers wrote:
> > >
> > >>I just got off the phone with a reseller of this product, he has
> > >>informed me that there is software that must reside within the head
> > >>unit in order to control it. He said it won't work even if we get the
> > >>wiring matched up.
> > >>
> > >>If this is the case how hard/$$$expenisve would it be to switch over
to
> > >>a head unit it was designed to work with? Anybody know much about
them?
> > >>Here is some information on compatible receivers:
> > >>
> > >>http://www.crutchfield.com/cgi-bin/S-B7ufPDLVsI8/ProdView.asp?
> > >>a=&s=0&cc=01&g=50800&id=detailed_info&i=023MDP01
> > >>
> > >>
> > >>
> > >>So I won't be ordering one at this time....anybody else more willing
to
> > >>take a gamble? Looks like a nice system...BUT will require replacing
> > >>the factory head unit which will lead to new speakers, etc.
> > >>
> > >>
> > >>HTH
> > >>Chris
> > >>
> > >>
> > >>--- TODD KRAMER <toddekramer at msn.com> wrote:
> > >>>S-listers:
> > >>>
> > >>>Here is the pin-out for the
> > >>>http://www.sounddomain.com/shoplist~b~Blaupunkt~t~MP3+Changers:
> > >>>
> > >>>
> > >>>Bose Gamma Head Unit: Connector II (CD Changer Input)
> > >>>
> > >>>1 - Bass Right
> > >>>2 - Bass Left
> > >>>3 - Bass, Ground (common)
> > >>>4 - Ground (-)
> > >>>5 - Switched 12V+ Power
> > >>>6 - 12 V +
> > >>>7 - Data
> > >>>8 - Data
> > >>>
> > >>>MDP-01 pinout (Blaupunkt C-3 Connector)
> > >>>
> > >>>13 - CDC Data
> > >>>14 - CDC Data
> > >>>15 - 12 V +
> > >>>16 - Switched 12V+ Power
> > >>>17 - CDC Ground (-)
> > >>>18 - CDC AF/Aux Ground (CommonO
> > >>>19 - CDC AF/AUX - Left
> > >>>20 - CDC AF/AUX - Right
> > >>>
> > >>>(Simply the reverse order of the Gamma Unit)
> > >>>
> > >>>Compatible ... logic says yes ... just need a willing soul to attempt
> > >>>the cross-wire.
> > >>>
> > >>>
> > >>>Todd Kramer
> > >>>' 95 S6 with Blaupunkt Head Unit and MDP-01 1Gig Harddrive
> > >>>
> > >>>
> > >>>\
> > >>>
> > >>>
> > >>>_______________________________________________
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> > >>
> > >>
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