Re: OBDC & Antenna

[Roadside Attraction <honge@creighton.edu>]

On Mon, 21 Aug 1995 LToy@aol.com wrote:

> In a message dated 95-08-21 15:44:57 EDT, you write:
> 
> >Another is to check the leads.  Mike LaRosa has two 89's, and one of 
> >them has separate AM and FM antenna connections - evidently like some 
> >other models mentioned today.  He says the rear glass has the AM 
> >antenna, and he recommends checking to make sure it's intact and 
> >connected.
> 
> About this time (late 80s), many stereo vendors came out with a "Dual
> Diversity" antenna system--you hooked up two different antennae to the
> stereo, and the stereo would choose the better signal between the two.  I
> don't know if this was for FM only or both AM & FM, and I don't know if the
> Audi/Bose used this system.
> 
> I've never looked at the stereo in my '91 200 so can't report on it.  
> 
> ---Linus
> LToy@aol.com
> 

A true "diversity" tuner will use two antennae at the simultaneously when 
in use. And by using some fancy circuit, would electronically reduce or 
elimnate "ghost" signals (which is formed by real signal bouncing off 
concrete walls of building and tunnels, etc., creating a secondary -- or 
"ghost" -- signal) by comparing the signals (difference in timing) 
received at both antennae and lock onto the real signal (which usually 
is the stronger of the signals received).

As such, I'm more incline to believe that one is for AM and the other is 
for FM -- especially if the shape/configuration is different for front 
and back (of couse, I could be wrong since I've never seen one).

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