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  #1  
Old 03-24-2002, 02:34 PM
jaisonline jaisonline is offline
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BMW's 3 channel diversity FM reception with aftermarket head unit?

BMW's 3 channel diversity FM reception with aftermarket head unit?
I've heard that many aftermarket head unit installs in BMW 3-series have resulted in poor FM radio reception. BMW uses interior three antenna which I believe are mounted on the rear and front windows.

The poor reception is because of BMW's 3-channel FM diversity antenna feature which is used in the 3-series.

Has anyone been able to do anything about the poor reception after an aftermarket headunit install? Have you been abled to add an aftermarket stereo while still keeping factory FM diversity antenna feature?

I have a Pioneer Premier DEH-P900 which I'm going to install in my car. I've heard that Scosche Industries sells an antenna BMW/VW amplifer adapter but wouldn't that just amplify the poor FM reception coming through one of the 3 antennas which the head unit will be using?

In summary, how can I keep the factory's 3-channel FM diversity antenna feature with an aftermarket headunit?

Thanks,
jaisonline
bmw '02 325xi
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  #2  
Old 03-26-2002, 07:40 PM
jaisonline jaisonline is offline
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come on. nobody has experience with this? i don't believe everyone has left the stock head unit in their e46.
  #3  
Old 03-26-2002, 08:00 PM
Nick325xiT 5spd's Avatar
Nick325xiT 5spd Nick325xiT 5spd is offline
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Mein Auto: M3 & 323i/999 KP
I would recommend going to www.e46fanatics.com.

We on this board tend to leave our cars relatively stock. They tend to be much more mod oriented there. You'll probably get a lot more useful and diverse ionformation from them.

Nick
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  #4  
Old 03-26-2002, 10:20 PM
31st330i 31st330i is offline
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The McIntosh MX-406 has a dual diversity antennea. I don't care for how it looks in a BMW but it's one of the best purist's head units available (at least last I heard). I had this head unit allong with a couple of McIntosh amps (MC431 bridged to 220x2 and an MX-443 300 watt mono sub amp) driving Dynaudio speakers in sealed enclosures. Outstanding stereo! never did hook up the diversity antennea lead, though because the host car didn't have a dual antennea. I wanted to add one but cuoldn't figure out a clean way to do it. oh well.




http://www.getplugged.com/mcintoshla..._caraudio.html
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  #5  
Old 03-26-2002, 10:38 PM
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Kaz Kaz is offline
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At one time in my previous car, I had a Sony CDX-900ES head I got cheap (and sold for profit almost 2 yrs later) which had diversity inputs. It was really simple in that car, though, since the factory radio had 1 normal Motorola connector and 1 smaller 'GM' connector that I slapped an adapter on and plugged both into the Sony. I wanted a 'fancier' head and replaced it with a Pioneer DEH-P835R, but it didn't have diversity so I just disconnected the power antenna altogether and used the in-glass.

I've done a couple of installs in Nissans, and the diversity adapter that normally goes with those just connects one of the two antennas to the head.

Anyhow, according to the Bentley, (which only really discusses the wagon and convertible systems) the diversity switch in the back of the car determines which antenna it uses, and there is only a single signal sent to the radio. I'm not sure this is right, though, since my radio in diag mode shows 2 different FM signal strengths.
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  #6  
Old 03-26-2002, 10:59 PM
31st330i 31st330i is offline
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actually, one of the problems I remember having with the MX-406's diversoty antenna was finding a connector to fit it. I in fact remember that the small GM connector didn't work (too large as I recall). McIntosh head units are made by Clarion (very similar to the old Clarion 9255). the one connector that would fit the radio was the diversity antennea that mazdas came equipped with. problem was that if I really wanted the diversity connector, I would have had to order a $70 harness from an MPV to get it. the FM sounded GREAT as it was but I listened mostly to CDs so it wasn't worth th ehassle.
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