[s-cars] S6 Cell Phone

[Varon H. Fugman]

Paul,

1. The factory analog cell phone uses a speaker in the center console...
under he armrest and just to the rear of the cup holders.  The mic is in the
A-pillar, of course.  The stereo is automaticly muted while using the phone.
(The factory phone was fairly cutting edge for its time with voice command.
To bad analog is being phased out.)

2. Several people (including me) have integrated hands free kits (mostly
Nokia) with the Audi factory speaker & mic.  I'm not satisfied with the
sound quality I'm getting in handsfree mode yet... will work on it more when
the weather warms up.  I'll write up an urS6-specific set of instructions
when I ever get it up to snuff.

There several articles on the AudiWorld site.  Most are based on
installations in various year A4 models.  However, the pinout information
for the DB-25 connector in the trunk and the RJ-45 connector in the center
console seem to also hold true for the urS models.  Here's one of those
articles:

Use this link, then select the Electronics link on the left to see the whole
list of electronics-related articles.  There are several cell-phone
articles.
http://www.audiworld.com/tech/

There's a new article called "Integrating Motorola Timeport" that might be
of particular interest for what you are trying to do:
http://www.audiworld.com/tech/elec71.shtml
Their use of two 5V relays to achieve the stereo mute function is very
clever.  Note that the mute function is more than a luxury if you are trying
to integrate with the Audi mic & speaker... without the mute line pulled to
ground, the mic & speaker aren't enabled.

In any case, all the signals needed are available on the DB-25 connector in
the trunk than connects to the factory phone transciever (which can be
removed.)  The connections for power, ground, mute, speaker & mic show up on
this connector, as well as 8 pins that connect to the RJ-45 jack under the
armrest area.  The idea is to wire up a custom DB-25 connector that will
"patch through" the signals you need to the RJ-45 jack, then work from there
inside the car.

Hacking up a low-end handsfree kit as described in the article might be a
good way to go for what you want.  You probably could build a from-scratch
solution that would just connect to the 3.5mm headset plug on the phone, but
you'd loose the ability to automaticly trigger the mute function.  You also
wouldn't get the ability to power/recharge the phone without a separate
adaptor.

Getting the factory mic to work well is the biggest challenge.  There is a
built-in pre-amp for the factory mic, and therefore when connected directly
the signal tends to overdrive my handsfree kit, giving distorted sound.  (I
expected this to be the case, but thought I would see if I could get away
without needing to build a level-matching circuit.)

The article below includes a level-matching circuit with a couple of
capacitors, a resistor and a pot.  I'm planning on adding this to my set-up
soon with hopes that it will resolve my sound quality issues.
http://www.audiworld.com/tech/elec12.shtml

Varon
'95 urS6 -- with more-or-less integrated Nokian handsfree kit

-----Original Message-----
From: s-car-list-admin at audifans.com
[mailto:s-car-list-admin at audifans.com]On Behalf Of Paul Anderson
Sent: Saturday, March 01, 2003 11:04 PM
To: s-car-list at audifans.com
Subject: [s-cars] S6 Cell Phone


Greetings All,

The factory analog cell phone in the '95 S6 isn't of much use to me.
However, the handsfree operation (speaker and microphone) would be quite
handy.  This leads me to two questions:

1. While in handsfree mode, did the factory cell phone use an external
speaker or a speaker on the handset itself?

2. Has anybody made an adapter for mating the outputs from a traditional
Motorola headset jack into the wiring for the stock phone?

Thanks for your input.

Paul
'87 5kcstq - for sale
'95 S6 - heir apparent

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