Hi,
What's all this business I hear people talking about blasting people's
car stereos or killing cars altogether with high-power RF? I run 2m,
10m, and 11m in my jeep and I'd like to sort out the fact from the
legend and find out what kind of power I can use without risking
damage to my jeep or cars around me. At what power level is front-end
overload to a nearby radio likely? At what power level is damage
likely, and to what componets?

I am currently using only 50 watts on a 5/8 wave (2m), 25w on a 1/4
wave (10m), legal 4w on a 1/4 wave (11m)

Thanks,
Nelson KE5MBX

On Feb 12, 5:17 pm, "KE5MBX" wrote:
Hi,
What's all this business I hear people talking about blasting people's
car stereos or killing cars altogether with high-power RF?

Seems reasonable that high intensity RF could incapacitate the modern
electronics that control your average car these days. Put enough RF
at the right frequency in the right place and you can disrupt just
about anything. I'd bet that the stories are based somewhat in truth.

However, the question of "how much" would it take would not be easy to
answer. I've heard that 2 meter communications at reasonable power
levels would cause specific models to stop running, but I've not seen
it myself. I suppose that it would be likely that high power
communications could draw too much current and cause the battery
voltage to dip below minimum levels required to keep the car running
(with a week battery and low alternator output) and folks could be
confused as to what actually happened... But we are talking theory....

I currently can run just south of 50W on 2 Meters in my 93 Jeep grand
Cherokee and only rarely have issues with the audio system. I can
desense the receiver when transmitting at high power, but that is not
surprising as the two antennas are about 2 foot apart and run parallel
for most of the 2M antenna. I cannot imagine how much RF I'm pushing
into the poor car's stereo. I've had no permanent damage to the
stereo. I can usually drop back to 5 watts and keep talking w/o any
issues so I assume I'm not causing others issues. The car keeps
running (well as best as can be expected for something with 160K
miles) on either power setting. I've also put this setup in a 2001
Ford Expedition and have had no issues with the stereo as of yet, but
the antennas in this situation are separated vertically so I would
assume the isolation is much better.

I'd bet that if you keep your RF field strengths under the FCC
specified limits in the cars around you, and your car keeps running,
you won't cause anybody else permanente problems. Car designers have
to deal with possible situations where RF field strengths are very
high (like when you drive past a broadcast transmission tower) so I'm
sure they've designed and tested their stuff to make sure it survives
these situations. If you stay within the FCC rules on field strengths
I'd wager that nothing serious is going to happen to somebody else's
car.

You may cause yourself issues, but I doubt you will cause any
permanent damage. If you do have issues (the car stops running or the
stereo makes strange noises when you transmit) there are ways to deal
with that stuff and I'd cross that bridge when you get to it.

-= Bob =-

On Feb 14, 5:46 pm, "KC4UAI" wrote:
On Feb 12, 5:17 pm, "KE5MBX" wrote:

Hi,
What's all this business I hear people talking about blasting people's
car stereos or killing cars altogether with high-power RF?

Seems reasonable that high intensity RF could incapacitate the modern
electronics that control your average car these days. Put enough RF
at the right frequency in the right place and you can disrupt just
about anything. I'd bet that the stories are based somewhat in truth.

An Electro Magnetic Pulse would kill cars, like if a nuclear weapon
was detonated (not detonated near the car in question for example,
the car would be dust if it did) and fry the electronics so purvasive
in today's automobiles.

wrote:

On Feb 14, 5:46 pm, "KC4UAI" wrote:

On Feb 12, 5:17 pm, "KE5MBX" wrote:


Hi,
What's all this business I hear people talking about blasting people's
car stereos or killing cars altogether with high-power RF?

Seems reasonable that high intensity RF could incapacitate the modern
electronics that control your average car these days. Put enough RF
at the right frequency in the right place and you can disrupt just
about anything. I'd bet that the stories are based somewhat in truth.


An Electro Magnetic Pulse would kill cars, like if a nuclear weapon
was detonated (not detonated near the car in question for example,
the car would be dust if it did) and fry the electronics so purvasive
in today's automobiles.


The scholar Scheissman has spoken with the use of the word "pervasive"
being incorrectly used as "purvasive"? A real college graduate, bwhahahhaha!

On Feb 14, 5:38 pm, wrote:

An Electro Magnetic Pulse would kill cars, like if a nuclear weapon
was detonated (not detonated near the car in question for example,
the car would be dust if it did) and fry the electronics so purvasive
in today's automobiles.

True, but running 50 Watts on 2 Meters is not even *close* to the
field strength you are describing. You are talking about huge amounts
of energy, we are talking about field strengths that are much lower.

"KE5MBX" wrote in message
oups.com...
Hi,
What's all this business I hear people talking about blasting people's
car stereos or killing cars altogether with high-power RF? I run 2m,
10m, and 11m in my jeep and I'd like to sort out the fact from the
legend and find out what kind of power I can use without risking
damage to my jeep or cars around me. At what power level is front-end
overload to a nearby radio likely? At what power level is damage
likely, and to what componets?

I am currently using only 50 watts on a 5/8 wave (2m), 25w on a 1/4
wave (10m), legal 4w on a 1/4 wave (11m)

Thanks,
Nelson KE5MBX

Hello Nelson.

I can offer a couple of references:
1. The ARRL publish a book on mobile operation (incuding aeronautical etc)
and I belive it includes a section on car manufacturer's comments about cars
and RF. I cannot be certain because my copy has been mislaid.

2. Mercedes Benz cars have a compatility table in their handbooks.
Interestingly, the table is aimed directly at amateur bands.
Again, if I can find a copy then I'll posdt what is in the table.

73, Ian
G4EAN

On Feb 15, 1:15 am, Billy Smith wrote:
wrote:
On Feb 14, 5:46 pm, "KC4UAI" wrote:

On Feb 12, 5:17 pm, "KE5MBX" wrote:

Hi,
What's all this business I hear people talking about blasting people's
car stereos or killing cars altogether with high-power RF?

Seems reasonable that high intensity RF could incapacitate the modern
electronics that control your average car these days. Put enough RF
at the right frequency in the right place and you can disrupt just
about anything. I'd bet that the stories are based somewhat in truth.

An Electro Magnetic Pulse would kill cars, like if a nuclear weapon
was detonated (not detonated near the car in question for example,
the car would be dust if it did) and fry the electronics so pervasive
in today's automobiles.

The scholar

Yet the scholar "Billy:" can't even spell Florida correctly!
BWHAHAHAHAHAHAHA!
Billy "Dumbass who can't put together a sentence" Smith shows off
those English skills, quite ironically in
.net:
"That's interesting there idiot. I bet you really did flunk high
school math and probably elementary too. Oh thats right, wasn't that
when was in
Floriduh. Spelled Florida but the DUH is for your Dumb Ass."

"wasn't that when was in Floriduh" - Billy makes good **** up!

Billy "shoots" himself in his palsied club foot once again in
Message-ID .net:
"Roger, shots himself in the foot"


Billy the "Rhodes" scholar ****s up again and even demonstrates he is
an imbecile in et:
"Right you are, wannabe Rhode's Scholar!"


Billy the illiterate retard Smith screws up again, and his illiteracy
is exposed. "It serves him right."
.net:
"Deserves him right."

Billy "retard" Smith confesses to his generally accepted retarded
status in . net:
"I'm a general retard. bwhahaha"


Billy "spelling champ of the general retards" Smith admits his bad
hygiene but is still in denial about his English skills in
. net
"Sure I can spell and smell."

"Billy" the NOtwordSmith ****s up again with this incompete sentence
in
et:
"So when you got divorced boy, did your finally figure out that your
more"

Billy "cumgargler" Smith managed to awaken from his drunken stupor to
slobber
in :
"Isn't that you mom weighed"


Mr."Education" Billy Smith steps on his own dick again when he talks
about others' "educations" (or educatiion" as he spells it) in
t:
"Uh, huh. Right LOSER. Still smoking that dope again? By the way how
is your
so called educatiion actually doing for you? Those online classes."

Billy Smith shows off his Pulitzer Prize writing skills in
t:
"You're whole life has been exhaled before."

Billy "illiterate retard" Smith spikes the "HUH?" factor in this
slobbering in
.net:
"Come on, do it just have you some spiked Kool Aid."

"Didn't" your special-Ed teacher teach you how to spell, Billy?
in k.net:
"...didnt Marie teach you to play nice"

"Rhodes scholar" Billy Lardass Davies Smith blunders and blows his
cover again in . net:
"Rhode's scholar Scheissman blows his cover again."

Billy "dumbass" Smith steps on his own tiny dick when he tries to
criticize others' typos,but he doesn't "perform" well as usual with
his blatant "stupidity" in
. net:
"Noteed!!!!!!!!!!!!!! Bwhahahahahahah. You're a brilliant one
Scheissman.
You even peform stupid acts on your blatant stupidty"

Billy "dropout Lardass" Smith steps on his own dick when he tries to
comment on others' spelling abilities, but he "can't" do any better in
Message-ID: . net:
"Woger cant spell very well anyway."

Billy "dropout pizza BOY" Smith ****s up his sentence again when he
blathered in :
"How about those retest letter you received for jamming."

Billy "illiterate " Smith claims to have been in the Library, but he
can't even spell "I've" correctly, maybe Billy should check out the
English tutoring books there in WpFgg.
:
"Ive been to quite a few libraries on Sunday and a lot of them are
open."

Billy Smith "the" ill-educated moron ****s up again in
. net:
"Roger is about to finally have th final episode where..."

Billy Smith stumbles on his club foot in his fat mouth when he tries
to claim "hillbillies" are somehow inferior( he squeaks from
"experience"?) in 7CdRg.11366$v
:
"Is that another fine quality of the Hillbilly state? You know, that
third world one where you live full of miscegenation, inbreeding, and
the like. Speaking from experrience again?"

Billy the spelling bee champ Smith ****s up again while trying to make
fun of others' typos and pegs the irony meter in my5Sg.
:
"Would that by "that" Woger? How abou that Todd rather
than "Taod"?"

On Feb 15, 11:55 am, "KC4UAI" wrote:
On Feb 14, 5:38 pm, wrote:

An Electro Magnetic Pulse would kill cars, like if a nuclear weapon
was detonated (not detonated near the car in question for example,
the car would be dust if it did) and fry the electronics so purvasive
in today's automobiles.

True, but running 50 Watts on 2 Meters is not even *close* to the
field strength you are describing. You are talking about huge amounts
of energy, we are talking about field strengths that are much lower.

Not so, any of the electronics in the rig would be fried!

Andy the Perv Timberlake wrote: Nothing of consequence

Schiessman likes to blow his wad about my misspelling of the word
"Florida" which is you return to the prior post was intentionally
misspelled to poke fun at the Glendale white trash homo. He can't get
over the fact that I am educated in a far more superior manner than his
poor white trash ass even could be. Of course, we have never heard what
lowball degree he claimed to receive from USF. Was it a degree of
something of consequence or some flunky diploma.