I still say there's something else wrong. My Cobra CB doesn't have ANY
noise what-so-ever coming out of it. Even with the older MSD-6 box.
- Bernd
----- Original Message -----
From: "Mitchell Carson" <Mitchell.Carson@dalsemi.com>
To: <dakota-truck@buffnet.net>
Cc: <geoffrey.hausheer@intel.com>
Sent: Tuesday, August 22, 2000 8:37 AM
Subject: Re: DML: MSD ignition install
> Hi Geoff
>
> Fusing both the positive and negative lines to the MSD is a good idea.
However, there's no way that a 12 gauge wire can carry 60 amps at 12 volts.
I'd be more inclined to go with a 15 to 20 amp fuse as that's about all 12
gauge wire can carry at 12 volts without overheating.
>
> As for interference, the MSD filter is nothing more than a 26,000 uF 24VDC
electrolitic capacitor. Make sure you get one that's rated for high
temperatures. Caps like this can be purchased at most any electronics shops
for less than $3.00. The MSD price tag of $25+ is ridiculous! The filter
<ahem, capacitor> wires between the MSD and the battery -- positive lead
from the MSD to the positive side of the cap, positive side of the cap to
battery positive, same on negative lead. It functions as a voltage buffer.
>
> In my installation, the filter <ahem, capacitor> didn't do any good. The
MSD unit is interfereing with my amateur transceiver (144 to 148 MHz, FM
mode). I've done some investigation and found that the noise isn't coming
in on the power leads -- it's being received by the antenna (confirmed by
using a handheld scanner). Apparently the MSD unit uses some sort of
oscilliator that oscilliates near the 150 MHz range. Apparently the MSD
unit isn't FCC Part 15 compliant. I've posed some questions to MSD Tech
Support on this subject...still waiting on their reply.
>
> So I'm stuck...it appears that I can't have both. I either run the MSD or
do without my amateur radio, at least for now. Presuming I can't eliminate
the interference, does anyone want to buy a two-week-old MSD-6A and Blaster
SS coil?
>
> -Mitch
>
> > From: "Hausheer, Geoffrey" <geoffrey.hausheer@intel.com>
> > Subject: DML: MSD ignition install
> >
> > Okay so I got an MSD 6BTM for my truck (yeah I've heard that people
haven't
> > gotten much out of the 6BTM, but I've heard some good things about it as
> > well). anyhow, I wanted to add an inline fuse near the battery (so that
I
> > don't have unfused live power running around in my truck), and when I
called
> > MSD, they told me to put a 60AMP fuse in! But the unit only comes with
> > 12-gauge power wire, which I figure somewhere between 1.6ohm and
> > 3.2ohm/1000feet, and is rated somewhere arund 20Amps continuous-current
> > (probably a bit less for the stranded wire). So does anyone know what a
> > reasonable sized fuse for the MSD-6 series is? If I put a 60AMP fuse in
> > there, it's basically like not having one, but I really don't need to
blow
> > the fuse while hauling down the interstate.
> >
> > As a side note, I'm getting a lot of interference through my amp (not
the
> > radio though) I remember somone asking about the filter (just a
capacitor,
> > right?), but I dunno if anyone ever said what the value was. If I knew
how
> > much power it could draw, I could probably size it myself (but obviously
I
> > don't). If anyone has any info on the filter, please let me know.
> >
> > Thanks,
> > .Geoff
>
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