[Mobile-Portable] Computer heavy vehicles

[james Owen]

Hi Joe,
    A few comments. I also drive a BMW, '87 325IS and have had no real 
trouble with 2m FM. With the ignition on there are a couple of spurs 
from the computer that can be heard but none have been found in the 2m 
band. When driving with the cruise engaged if I use 25W or more when I 
transmitt there seems to be a slight loading of the engine though the 
speed never changes. I suspect a little RF is getting into the computer 
that changes the mixture somehow but not enough for the computer to 
report a problem or to change speed. I also go directly to the battery 
in the trunk and the antenna is a Larsen mounted through the trunk lid. 
I have a little ignition noise that I think I will have to work on 
before I go to HF. Remember that the computer is mounted over the glove 
box so it best not to mount the radio too close.
    I don't think that you will have any real problems with the rig 
mounted in the trunk, if you ground it good to the battery and the 
chassis near the battery and keep the SWR on the antenna below 2:1.
Let me know what you find as I'm planning on buying another BMW in the 
next year or so (219K on the present one) and would like to know of any 
problems discovered.

Joseph Stans wrote:

> I just purchased a BMW with computers that run everything including the
> cigar lighter (I think). The dealer said don't install any "third party"
> stuff when I asked about communications gear. His response led me to
> believe he really did not understand what I was going to do - install an
> ICOM 706MKIIG. Has anyone out there had experience with computer
> problems or operational problems? I intend to choke everything between
> the radio and the car. The install itself will be on a board in the
> cargo area and an external receiver hitch antenna mount. All the wiring
> would be a short run out the back through the door seal. The only
> physical connection to the car would be the ground and the power supply
> which, because the battery is in the rear would be very short and as I
> said heavily choked. Comments? Suggestions? Resources?
> 
> Thanks.
> 
> Joe Stans
> N6FPJ
> 
> 
> 
> 
> 
> 
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