Am new to the group, hope this is the place for such an inquiry: I'm thinking about installing a "Screwdriver" mobile antenna for 75 with a trunk mount on my 2001 Mazda Protege. The transmit power wi
On Fri, 04 Feb 2005 10:30:31 -0800, digital-conjurers@adelphia.net wrote: Unlikely if you follow good engineering practice. 1) Get your power directly from the battery ( both positive and negative).
positive and So far as "good enginering" goes, number one above causes a conflict with number 2 below. the braid MAKE SURE CAR BODY. antenna Think about it a while, maybe while drawing the entire sy
You're thinking resistance, not inductance or loop area. When you get the power via the closely paired cable (even better if it's twisted), you minimize the loop area of any issues with RF on that po
Why does that matter? When you it's on that That's not worth even considering Jim. The issue is NOT differential mode RF on the power cables. That are always very well bypassed together, and PA's of
Because the question was about whether he would have problems with the on-board computers. The lower the impedance of the power connection at RF, the less likely that is to occur. If the only connect
I agree with Jim...and in Fords that have a variable high voltage ignition system that radiates and couples to existing factory installed loops of single threaded 12+vdc lines, you got one massive RF
problems with power only is I totally disagree for all the reasons I gave. 73 Tom _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mail
voltage factory installed RFI problem the battery. Hi Dave, Why don't you connect a signal generator in differential mode to the battery leads and measure the RF ingress into the radio, and compare
Tom Rauch wrote: as long as the radio ground point has low resistance continuity to the battery negative terminal ground point. Isn't that the reason why the recommendation to connect directly to the
Thanks for the fast response Tom. I always appreciate a thread where you're engaged in the conversation. I've spoken to Ford and Chrysler EMI engineers and they all believe this myth, as you say! I'v
negative directly to the ensure a low What everyone seems to fail to consider is the vehicle chassis itself is always less resistance than the long lead from the radio ground to the battery post, an
Absolutely. I agree fully with that.....but running the radio negative lead to the battery negative post is NOT one of them. awful negative from the 2m The phrase is "ground loop". If you ground to
Have we lost sight of the reason we are having this discussion? What effect does the *radio* have on *automobile* electronics? How the radio is grounded may indeed have an effect on where radio suppl
If you look at the ARRL RFI Handbook, it excerpts 2-way radio install recommendations from the big 3 automakers. They all suggest running a negative lead back to the battery, but they disagree about
Straight from the (GM) horse's mouth: - - - - - - - - GMNA Engineering Centers General Motors Corporation January 2002 Issue Radio Telephone / Mobile Radio - Installation Guidelines http://service.gm
Tom Rauch wrote: Oh come on now Al. Al? Are you actually trying to tell me the chassis of your unibody vehicle develops a high resistance path from major sheet metal components back to the inner fend
The benefit you'll most likely see from running power leads to the battery is reduced alternator whine. It isn't likely to affect the car's CPUs, but it can make the radio sound bad. This is an audio
radio all they suggests radio DC braid. battery battery. The best configuration, assuming the installer is somehow not able to figure out what is a good connection to the unibody, is to run a lead t