From digest.v7.n163 Sun Aug 24 14:36:29 1997
From: antenna <raul_at_antennaworld.com>
Date: Fri, 22 Aug 1997 09:53:45 -0500
Subject: antennas-diversity- re-posted
Here is a reply I wrote to somebody here last month and posted on the =
car digest. In another posting I said this was never posted but some of =
you wanted to see it so here is a re-posting. Plus I just read =
somebody's post about aftermarket radio and poor reception.
I noticed some complaints about bad reception in here today and wanted =
to add some comments.
The antenna system is a brand "FUBA" who is the leader in hidden =
electronic am/fm receiving antennas for moving vehicles. The company =
where I work was the Fuba aftermarket importer from the late 80s to =
early '90s. Fuba div was purchsed by Delco 2 or 3 years ago and they are =
now adding some hi tech antennas to GM cars.
I do have some block diagrams of 88-92 BMW antennas in the glass. At the =
time it was only the 5 and 7 series. Plus many VW group cars too.
The main thing I know is that the computer in the C pillar has 2 to 4 =
sep antennas connected to it and constantly looking for the strongest =
signal to send to the radio. It knows which is best because of an IF =
(intermediate freq) small coaxial cable coming from the radio to the =
computer. The computer also contains RF amps for each antenna ( or a =
If your reception stinks, maybe the IF line is disconnected or broken. =
Then the system defaults to a single antena ll the time, even AM band. =
Or if you dumped the OE radio for a fancy Sony/Pioneer/etc, same thing. =
No IF signal.
I dont think the IF line is data. I should be a voltage varrying which =
the computer simply reads. Maybe you can check that with a dig voltmeter =
but its just my educated guess.
Another thing is TINT. I did not realize it until I got metalized tint =
on my E-34 and reception went down 30%. It was bad for a few days until =
I got used to it. Or maybe the amp made itself stronger? I have =
excellent reception these days, after 2 years of the tint job. Very =
I wont be able to get updated '96'97 info as Fuba is now solid with the =
OEM business only and we lost our inside friends. Or they are there but =
with hands tied...
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