[amsat-bb] RF noise from a passing-by BMW i3

[Michelle Thompson]

I did some measurements on a 2011 Nissan Leaf while charging. The LED
lighting on the wall and disco ball motor directly above the car was
significantly louder than the noise from active charging (on 2m). The LCD
screen on the charger on the wall was somewhat noisy, but not as bad as the
LED lightbulb.

Similar results while driving around as a passenger. It's pretty quiet.
Haven't checked other bands yet while riding around.

Looking around for other cars and I found that my sewing machine is very
bad on 2m. Not much of a surprise given the type of motor involved, but
caught me off guard since I was focused on the garage and not the sewing
room!

The rise in the noise floor is death by a thousand cuts.

"I'll explain later" - Buckaroo Banzai

-Michelle W5NYV




On Tue, Jul 9, 2019 at 9:23 AM Daniel Holmes via AMSAT-BB <
amsat-bb at amsat.org> wrote:

> Almost have to take a radio with you on the test drive. I found the LCD
> screen of my Jeep wipes out VHF if I have an HT in the car. If I have an
> antenna on the outside, it’s not a problem. But I didn’t discover it on the
> test drive, because I didn’t bother with the radio (and I usually have it
> off on a test drive so I can listen to the car anyway). I’m not sure I’d
> break it out while the salesman is standing there, but I’d certainly try to
> listen in at some point before signing on the dotted line.
>
> Dan
>
> --
> Daniel Holmes, danielh at holmesonics.com
> "Laugh while you can, monkey boy!" -- Lord John Whorfin
>
>
> > On Jul 8, 2019, at 8:30 PM, STeve Andre' via AMSAT-BB <
> amsat-bb at amsat.org> wrote:
> >
> >
> >
> > On 7/8/19 6:16 PM, Zach Metzinger via AMSAT-BB wrote:
> >> For those of you considering operating around electric vehicles, beware
> of the copious noise emitted by the BMW i3.
> >> I was sitting in a parking lot, engine off, operating mobile on 10m
> during the recent band openings. Rather abruptly, the band's noise floor
> increased to mid-scale on the S-meter. I briefly wondered if propagation
> had suddenly changed, and then I noticed a BMW i3 pass behind me and leave
> the lot.
> >> The noise left as well... I was back to a nice quiet band floor.
> >> I didn't have time to switch over to 2m/70cm SSB and see how far up the
> racket extended.
> >> I stumbled across an article relating much of the same, today.
> >>
> https://www.greencarreports.com/news/1098893_bmw-i3-electric-car-quirk-no-am-radio--but-why
> So, save the planet or save the spectrum. Perhaps not both at the same
> time? :-)
> >> --- Zach
> >> N0ZGO
> >
> > Along these lines, I need a new car.  My Sonata has 404K miles and I
> would like to replace it before it dies.
> >
> > I'm really looking at the Prius Prime +.  Does anyone know if this emits
> > obnoxious things, and how radio-friendly it is, overall?
> >
> > Thanks!
> >
> > --STeve Andre'
> > wb8wsf  en72
> >
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