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killing cars with high RF?
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 |
killing cars with high RF?
On Feb 12, 3:17�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? 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 If you are using TeraWatts of output power (unlikely) or wish to detonate a nuclear device (for its EMP or Electro-Magnetic Pulse), you are not going to blast anyone's rig or ruin their auto boom-box or even harm their ignition from a ready-built amateur radio rig. As the good "doctor" said, your ham radio test should have clued you in on what is considered "harmful" to humans. How about reigning in some hysteria and folk tales and concentrate on actual building-testing-slinging-solder radio-electronics instead of some fantasy notions? :-( |
killing cars with high RF?
On Feb 12, 6:17 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? 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 There are many times when "high" power has disrupted other devices. The early car computers have been know to shut down with 100 watts of VHF. Worked on a police car that the engine would shut off when over 80 mph and key the radio. A friend would be taking on his 1KW mobile as he pulled into his driveway. He would find his base radio receiver front end blown. Took three times to think it through and as he should have been doing, switch his base antenna (dipole over the driveway) to ground, when not in use. |
killing cars with high RF?
On Feb 13, 4:02�pm, wrote:
On Feb 12, 6:17 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? 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 There are many times when "high" power has disrupted other devices. The early car computers have been know to shut down with 100 watts of VHF. Worked on a police car that the engine would shut off when over 80 mph and key the radio. *A friend would be taking on his 1KW mobile as he pulled into his driveway. He would find his base radio receiver front end blown. Took three times to think it through and as he should have been doing, switch his base antenna (dipole over the driveway) to ground, when not in use. Isn't that just ordinary RFI/EMI that can happen in a house environment? :-) Don't expect auto makers to RFI-proof their wiring without an extra kilodollar add-in to the sticker price. |
killing cars with high RF?
In article .com,
" wrote: On Feb 13, 4:02?pm, wrote: On Feb 12, 6:17 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? 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. Â*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 There are many times when "high" power has disrupted other devices. The early car computers have been know to shut down with 100 watts of VHF. Worked on a police car that the engine would shut off when over 80 mph and key the radio. Â*A friend would be taking on his 1KW mobile as he pulled into his driveway. He would find his base radio receiver front end blown. Took three times to think it through and as he should have been doing, switch his base antenna (dipole over the driveway) to ground, when not in use. Isn't that just ordinary RFI/EMI that can happen in a house environment? :-) Don't expect auto makers to RFI-proof their wiring without an extra kilodollar add-in to the sticker price. In Montana, there was a Sage radar, 5MW pulse power, which would zap your car radio when the beam crossed it. Fortuneatly this was in the 60's before the electronics control of your car's engine. The solution was to tilt the radar antenna up 5 deg. so both the town and the highway that passed in front of it were not impacted. Even so, I have tape recordings from that era which have a little zap in the every 12 secs as the lobes passed through town when the antenna rotated. Oh yes, and before the antenna was tilted, flourescent lights would also blink. Al |
killing cars with high RF?
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) About 2 years ago I was in a rather frivolous mood, brought about by a drop of absolute vodka. I wondered just how certain things reacted when put in a 750 Watt microwave oven. I first tried a new way of burning a CD. Amid sparks and a pyrotechnic display that appealed to my sense of ****edness, it sort of got crazy-paved. After about 20 seconds I had to switch off the microwave because of the stench. Then I turned to more "electronic" things. A Fujian MP3 player bit the dust instantly. Basically there was one huge "wooooofff!", then the PCB set fire to the plastic case after about 30 seconds. Then I tried an old hamradio rig. It was an old Trio (Kenwood in the USA) 2200GX, crystal-controlled rig, with a rubber-duck antenna, and a battery compartment that had not held batteries for several years. I put it in as it was, but without the mic. Battery door open, rubber-ducky antenna on. It sat there for about 15 seconds before anything happened, then the front panel sparked a bit and caught fire. The front panel looked similar to the CD, but a bit more melted-down, and the knobs had changed to a totally new shape. But apart from that, the radio itself still worked fine after a 30 second 750W cook. It just looked more of a mess then it did originally. Out of interest I tested it. I was expecting RF to get in the antenna and coarse its way through the PCB, but no! The RF sensitivity was 1.25uV PD for 20dB sinad. Perhaps that was 10dB down, but it was still quite useable The TX was still delivering 1.5 Watts. I took off the case and tried again, and THAT killed it for sure. After only 10 seconds the PCB "whooffed", with loads of sparks and spitting. But the point is that you cannot couple more power into a rig than that, even with the cover on. The antenna was connected, and 750 W did not kill it instantly, as expected. These rigs are far more resilient than one would imagine. BR Hairy NOSPAM_oeieio(at)hotmail.com |
killing cars with high RF?
On Feb 14, 5:31�am, Al wrote:
" wrote: On Feb 13, 4:02?pm, wrote: On Feb 12, 6:17 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? 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 There are many times when "high" power has disrupted other devices. The early car computers have been know to shut down with 100 watts of VHF. Worked on a police car that the engine would shut off when over 80 mph and key the radio. *A friend would be taking on his 1KW mobile as he pulled into his driveway. He would find his base radio receiver front end blown. Took three times to think it through and as he should have been doing, switch his base antenna (dipole over the driveway) to ground, when not in use. * *Isn't that just ordinary RFI/EMI that can happen in a house * *environment? *:-) * *Don't expect auto makers to RFI-proof their wiring without an * *extra kilodollar add-in to the sticker price. * In Montana, there was a Sage radar, 5MW pulse power, which would zap your car radio when the beam crossed it. Fortuneatly this was in the 60's before the electronics control of your car's engine. The solution was to tilt the radar antenna up 5 deg. so both the town and the highway that passed in front of it were not impacted. Even so, I have tape recordings from that era which have a little zap in the every 12 secs as the lobes passed through town when the antenna rotated. Oh yes, and before the antenna was tilted, flourescent lights would also blink. The flourescent lights blinking on by themselves and buzz tones in the 16 mm motion picture projectors' audio were common at the Radar Basics classrooms of Fort Monmouth, NJ, in 1952. The high-bay where 1 MW peak pulse search radars were set up were constantly annoying the instructors across the street in the classrooms. shrug Got annoying to the students too. But, none of that was in the league of "frying auto electronics" nor any real danger to humans at a half block distance. |
killing cars with high RF?
On Feb 14, 8:26�am, "Hairy Lethal" (spellin
mistaik) wrote: 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) About 2 years ago I was in a rather frivolous mood, brought about by a drop of absolute vodka. I wondered just how certain things reacted when put in a 750 Watt microwave oven. I first tried a new way of burning a CD. Amid sparks and a pyrotechnic display that appealed to my sense of ****edness, it sort of got crazy-paved. After about 20 seconds I had to switch off the microwave because of the stench. Then I turned to more "electronic" things. A Fujian MP3 player bit the dust instantly. Basically there was one huge "wooooofff!", then the PCB set fire to the plastic case after about 30 seconds. Then I tried an old hamradio rig. It was an old Trio (Kenwood in the USA) 2200GX, crystal-controlled rig, with a rubber-duck antenna, and a battery compartment that had not held batteries for several years. I put it in as it was, but without the mic. Battery door open, rubber-ducky antenna on. It sat there for about 15 seconds before anything happened, then the front panel sparked a bit and caught fire. The front panel looked similar to the CD, but a bit more melted-down, and the knobs had changed to a totally new shape. But apart from that, the radio itself still worked fine after a 30 second 750W cook. It just looked more of a mess then it did originally. Out of interest I tested it. I was expecting RF to get in the antenna and coarse its way through the PCB, but no! The RF sensitivity was 1.25uV PD for 20dB sinad. Perhaps that was 10dB down, but it was still quite useable The TX was still delivering 1.5 Watts. I took off the case and tried again, and THAT killed it for sure. After only 10 seconds the PCB "whooffed", with loads of sparks and spitting. But the point is that you cannot couple more power into a rig than that, even with the cover on. The antenna was connected, and 750 W did not kill it instantly, as expected. These rigs are far more resilient than one would imagine. Remember: All electronics works by means of smoke. If the smoke leaks out, it won't work... LA |
killing cars with high RF?
"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? A couple of years back there were cars that included the caveat that any transmitter installation would void the warrenty. Now that everyone and their brother uses their cell phones in the car I guess they don't put that notice in anymore. Back in the mid 1970's I was in NROTC in college. There it was mentioned that an EA6B (the electronics warfare version of an A6) could pulse its radar and fry the electronics of a plane in the cone if it was close enough (under 1 mile if I recall correctly). Anecdotal stories like that are the source of electronic killing rf. That involved a multi megawatt microwave pulse, not something you would normally see in an amatuer installation. Living in an apartment, years ago I tried putting a 10 meter dipole across the ceiling in a stealth installation, I shut down when the residents above me complained that their tv would scramble while I tried running psk31. You may not blow out their electronics but can definately interfere with them if they are close enough. thanks, John. KC5DWD |
killing cars with high RF?
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? 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 Some years ago I keyed up a 2 meter handi-talkie (maybe 2w out) with the 2 meter rig about a foot away from a Radio Shack 5" portable color tv. The 2 watts of 2 meter rf caused the TV to self destruct! I think something in the horizontal output section died. The TV was operating at the time (it probably would not have happened if the tv was off). The set was repaired by Radio Shack. |
killing cars with high RF?
On Feb 18, 8:00�am, "john graesser" wrote:
"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? Back in the mid 1970's I was in NROTC in college. There it was mentioned that an EA6B (the electronics warfare version of an A6) could pulse its radar and fry the electronics of a plane in the cone if it was close enough (under 1 mile if I recall correctly). Anecdotal stories like that are the source of electronic killing rf. That involved a multi megawatt microwave pulse, not something you would normally see in an amatuer installation. Back in the late 1960s I was a staff engineer at a small microwave company called Micro Radionics Inc. One of the projects I worked on was a pre-flight test set for the E6 Intruder. Battery-powered, it could be used on deck in front of the radome to confirm that the E6's radar was still operating properly. No specifications existed warning of "megawatt" peak pulse powers from Intruder aircraft. I'm not familiar with the EA6B and doubt it had "megawatt" output powers. EW designed to interfere with receivers generally don't need such high RF output powers. Living in an apartment, years ago I tried putting a 10 meter dipole across the ceiling in a stealth installation, I shut down when the residents above me complained that their tv would scramble while I tried running psk31. In 1960 I was living in a second-story apartment and put a short base-loaded CB antenna in the attic space about five feet in front of the stacked TV "vee" antennas for apartment dwellers, my own apartment included. The 2 W peak output CB had a 60 db minimum (measured) attenuation (at Channel 2) lowpass filter. No problems seen or reported. The TV transmitters in Los Angeles were all grouped on top of Mt. Wilson, about 30 miles away from the apartment. A simple thing such as a lowpass filter can solve a lot of problems before they happen. |
killing cars with high RF?
In article . com,
" wrote: I'm not familiar with the EA6B and doubt it had "megawatt" output powers. EW designed to interfere with receivers generally don't need such high RF output powers. Actually Megawatt Output Powers for Pulsed Radars are easily in the range of most military Radars.......note I say "Pulsed" and not "CW"... |
killing cars with high RF?
From: You on Sun, 18 Feb 2007 21:54:36 GMT
" wrote: I'm not familiar with the EA6B and doubt it had "megawatt" output powers. EW designed to interfere with receivers generally don't need such high RF output powers. Actually Megawatt Output Powers for Pulsed Radars are easily in the range of most military Radars....... Actually, NO. "Most" are not at over one-megawatt peak pulse levels. Do the "radar equation" or just do the two-way free space loss and then subtract the varying reflections of the target (way NOT uniform). That gets a reasonable approximation of power levels involved. A long-range ship search radar has high power. It must because it has to "reach" over the radio horizon. [more loss due to refractive bending and scattering effects] Intruders and Prowlers (E6 family) operate at altitude. Their direct radio horizon is much farther due to that altitude in comparison with a surface ship. Electronic Warfare suites concentrate on copying the enemy signal and returning it AS IF it were a target return, either there or some distance away or on either side. Only HALF the RF path is involved and the EW- originated signal is quite low in level. Again, do the "radar equation" but only the return path. "Jamming" with over-much RF power went out with WW2. It is much more subtle now and has been for years. The circa 1958 MacDonnell Quail missle was a small unmanned decoy air-breather with lots of automatic radar futz-up on it. B-52s carried them then. I worked a little bit on those at Ramo-Woldridge in El Segundo, CA. I'm also acquainted with the Association of Old Crows, a professional one made up of those who work/worked in Electronic Warfare. Try as I might, I can't remember anyone there called "You." :-) OK, let's get back to HOMEBREW things... |
killing cars with high RF?
On 12 Feb 2007 15:17:50 -0800, "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? 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 You aren't going to directly damage any cars around you even with high power, but you might affect some with a 100 on HF or even 2-meters. overload to a nearby radio likely? At what power level is damage Ham or broadcast? Broadcast is generally fairly sensitive to overload. On-the-road it's likely to be for a very short duration so I'd not worry about it. likely, and to what componets? With today's cars it's unlikely you are going to damage any components unless you have a grounding problem and then the computer is the most susceptible. 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) I've run 160 watts on 144 which will *typically* desense another 2-meter rig for up to a 100 feet or so, but it depends on the rig. I've also stopped the car next to another mobile with no *apparent* problem although here certainly had to be some desense. I've also "desensed" a mobile 50 feet away with a 5 watt HT (It did have a clean signal) I also shut down the cable TV system for an entire town with a 5 Watt HT at a demonstration, but that's another story other than to say two days after the demonstration you couldn't find a cable leak in the whole town. :-)) Some mobiles are running up to 600 watts on HF without problems while others can't get a 100. Most of the car manufacturers are saying you shouldn't go beyond a 100. I'd have no qualms about going to 500 or 600. If it works, fine. If it didn't I guess I'd have to pay for what ever broke. When I purchased my 4-Runner the Toyota mechanics ran the wiring for my VHF/UHF rigs and that was about 6 years ago. My wife runs a 50 watt (Kenwood TM-V7A) in a Toyota Prius (Hybrid). I'm thinking of leasing one while they still have good prices and a surplus of cars available which will disappear sooner with the price of gas going back up. Only problem with leasing the Prius is how to run an HF rig in there. Their 12 volt system is very light duty and that 500 volt batter might be a bit steep for my mobile rig. :-)) Thanks, Nelson KE5MBX Roger Halstead (K8RI & ARRL life member) (N833R, S# CD-2 Worlds oldest Debonair) www.rogerhalstead.com |
killing cars with high RF?
On 13 Feb 2007 16:02:34 -0800, wrote:
On Feb 12, 6:17 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? 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 There are many times when "high" power has disrupted other devices. The early car computers have been know to shut down with 100 watts of VHF. Worked on a police car that the engine would shut off when over 80 mph and key the radio. A friend would be taking on his 1KW mobile as he pulled into his driveway. He would find his base radio receiver front end blown. Took Some thing wrong there. I'm running two stations here and both are capable of the legal limit. The one in the shop is a bit more modest with a 2K4 instead of an Alpha, but both are *old*. OTH there is the whole Hallicrafters station in the shop as well. The antennas are fairly close and there has never been a problem. Those antennas http://www.rogerhalstead.com/ham_files/Tower30.htm (the wire antennas are difficult to see) are much larger than what your friend would have had on the mobile. Unless the mobile antenna was almost touching the other rig's antenna and I do mean almost touching it shouldn't have created a problem. The antenna over the driveway would have had to be *low* and very close to the mobile antenna. three times to think it through and as he should have been doing, switch his base antenna (dipole over the driveway) to ground, when not in use. I don't ground or disconnect any cables even during thunderstorms. Basically I can't easily get to the cables and any thunderstorm would be past by the time I could get them disconnected. The tower, with a large antenna system http://www.rogerhalstead.com/ham_files/Tower29.htmtakes an average of 3 visually verified direct hits a year although it took 5 by the beginning of August last summer. OTOH I have a good single point ground with 32 or 33 (lost count) 8' ground rods CadWelded (TM) to over 600 feet of bare #2 wire that ties the whole antenna system and house electrical ground together. Roger Halstead (K8RI & ARRL life member) (N833R, S# CD-2 Worlds oldest Debonair) www.rogerhalstead.com |
killing cars with high RF?
On 18 Feb 2007 12:48:50 -0800, "
wrote: On Feb 18, 8:00?am, "john graesser" wrote: "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. t what power level is front-end overload to a nearby radio likely? At what power level is damage likely, and to what componets? Back in the mid 1970's I was in NROTC in college. There it was mentioned that an EA6B (the electronics warfare version of an A6) could pulse its radar and fry the electronics of a plane in the cone if it was close enough (under 1 mile if I recall correctly). Anecdotal stories like that are the source of electronic killing rf. That involved a multi megawatt microwave pulse, not something you would normally see in an amatuer installation. Back in the late 1960s I was a staff engineer at a small microwave company called Micro Radionics Inc. One of the projects I worked on was a pre-flight test set for the E6 Intruder. Battery-powered, it could be used on deck in front of the radome to confirm that the E6's radar was still operating properly. No specifications existed warning of "megawatt" peak pulse powers from Intruder aircraft. Those were the days when the techs would check the output by putting their hands up in front of the antenn to see if they'd get "warm". (always take any rings of first thoughg) I'm not familiar with the EA6B and doubt it had "megawatt" output powers. EW designed to interfere with receivers generally don't need such high RF output powers. Living in an apartment, years ago I tried putting a 10 meter dipole across the ceiling in a stealth installation, I shut down when the residents above me complained that their tv would scramble while I tried running psk31. In 1960 I was living in a second-story apartment and put a short base-loaded CB antenna in the attic space about five feet in front of the stacked TV "vee" antennas for apartment dwellers, my own apartment included. The 2 W peak output CB had a 60 db minimum (measured) attenuation (at Channel 2) lowpass filter. No problems seen or reported. The TV transmitters in Los Angeles were all grouped on top of Mt. Wilson, about 30 miles away from the apartment. A simple thing such as a lowpass filter can solve a lot of problems before they happen. Roger Halstead (K8RI & ARRL life member) (N833R, S# CD-2 Worlds oldest Debonair) www.rogerhalstead.com |
killing cars with high RF?
hallo
It seem to be a issue to the famous TV serie mythe busters Seen the amount of respons it seems to be a hot item i like discusions to learn things and broading my range of vision also to know people of other backgrounds can amateurradio blow up cars and/or its equipments ?? the today cars are crammed by electronics,sensors boardcomputers etc is this equipment BCI free a simple case of BCI may casue a serious accident by blocking a aboardcomputrer. who is responsible the cars industry by ignoring the bci problem or is the transmitting ham Nelson's question does bci in cars exist ? Yes it does many examples even trafficligths included It seems to me that manufactories know the bci problem.often pcb's have already holes for the needed components who is responsible The bci problem has a profit too!! I live opposited a snackbar yougsters in their cars equiped with stereo amp's loadbawlers and their 130dba bonky bonk music A 100watts carrier stops that ( not always) nelson asked what 's the fieldstrongth of RF that effects carequipments I have heard that a resaerch institute somewhere in SM or OZ has discovered a strange effect into a TV set sensibillity to bci and tvi was tuned to the amateurbands by manufactor !! So the radioamateur had to solve the problem and not the manufactor ! I hope to see your response 73 de Ruud PA0RAB "KE5MBX" schreef in bericht 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 |
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