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Subject: want circuit/schematic for CB "jammer"
From: donut (Limitedselection) wrote in : Thanks - Mike posted about sky waves (I was unaware of), so even a very low power device centrally located in my property would apparently be heard world-wide - which is NOT what I want. I hardly think this would be a problem. For one, you'd need an antenna radiating a large proportion of skywave. Second, the CB bands are loaded with all kinds of open carriers, whistlers, music players, etc. so your tiny part in this would be unlikely to harm anyone. Donut, Thanks for the info. Earlier someone suggested using a mobile CB with a car battery and a magnet antenna and a garbage bag - and placing this as close to the neighbor antenna as possible. I think building a low-power jammer and placing it close to his antenna would be a better solution. Less expensive and totally disposable. You are one of the few people on Earth (well, at least on usenet - on usenet so far since I posted yesterday) that seems to think that this would be relatively harmless. Other people are equating asking for a jammer schematic to asking for information on manufacturing chemical/biological/nuclear weapons (it probably sounds like I am kidding about this - but I am NOT). Thank you for your rational/calm approach to this! Anything you might do to jam this CBer (like an oscillator to transmit an OC) would also jam the walkie talkies. 1. Change the channel the walkie talkies operate on, or 2. Replace them with walkie talkies using another band. I believe there are walkies talkies that also operate around 49 MHz. At this point I am still looking for LOW POWER jammer schematics. Although someone told me that some are on the way. Thank you for your information though, I appreciate it. |
Subject: want circuit/schematic for CB "jammer"
From: donut (Limitedselection) wrote in : I wouldn't be worried about thelegal issues if skywave was not an issue. But unfortunately it looks like with skywave any signal no matter how small can be heard world-wide. This is ridiculous. Try talking skip even on a car CB putting out legal power. It ain't gonna happen. Beside, the solar cycle is on it's downward spiral, and skip openings on 29 MHz are going to become few and far between and the cycle deepens. If your local CBer is primarily a "skip" talker, that in itself might take him out. Donut, Thanks for the info. I am just looking for a low power, low cost (cheap) and disposable cb jammer circuit. A lot of amatuer radio operators and RF engineers are telling me that such a device could wreak havoc world-wide even though it would be mere mw in power. According to them 'skywaves' would allow the jammer to reach the entire planet and jam communications world-wide. I certainly don't want to jam world-wide communications, so unless someone has a 'safe' schematic I am out of luck I guess. Thanks again donut! |
Subject: want circuit/schematic for CB "jammer"
From: donut (Limitedselection) wrote in : I wouldn't be worried about thelegal issues if skywave was not an issue. But unfortunately it looks like with skywave any signal no matter how small can be heard world-wide. This is ridiculous. Try talking skip even on a car CB putting out legal power. It ain't gonna happen. Beside, the solar cycle is on it's downward spiral, and skip openings on 29 MHz are going to become few and far between and the cycle deepens. If your local CBer is primarily a "skip" talker, that in itself might take him out. Donut, Thanks for the info. I am just looking for a low power, low cost (cheap) and disposable cb jammer circuit. A lot of amatuer radio operators and RF engineers are telling me that such a device could wreak havoc world-wide even though it would be mere mw in power. According to them 'skywaves' would allow the jammer to reach the entire planet and jam communications world-wide. I certainly don't want to jam world-wide communications, so unless someone has a 'safe' schematic I am out of luck I guess. Thanks again donut! |
Have you concidered the DS1086 Spread Spectrum Econoscillator from
dallas Semiconductors. A programmable Oscillator ( between 260Khz and 130Mhz ) with a selectable 'dither' of either 2% or 4% ) powered from a few AA cells would last a very long time and would sit nicely in the grass by the CBers Aerial and clutter up his comms very effectivly ;-) Very Tongue in cheek... Mike W -- On 06 Sep 2003 07:31:53 GMT, (Limitedselection) wrote: Subject: want circuit/schematic for CB "jammer" From: donut (Limitedselection) wrote in : Thanks - Mike posted about sky waves (I was unaware of), so even a very low power device centrally located in my property would apparently be heard world-wide - which is NOT what I want. I hardly think this would be a problem. For one, you'd need an antenna radiating a large proportion of skywave. Second, the CB bands are loaded with all kinds of open carriers, whistlers, music players, etc. so your tiny part in this would be unlikely to harm anyone. Donut, Thanks for the info. Earlier someone suggested using a mobile CB with a car battery and a magnet antenna and a garbage bag - and placing this as close to the neighbor antenna as possible. I think building a low-power jammer and placing it close to his antenna would be a better solution. Less expensive and totally disposable. You are one of the few people on Earth (well, at least on usenet - on usenet so far since I posted yesterday) that seems to think that this would be relatively harmless. Other people are equating asking for a jammer schematic to asking for information on manufacturing chemical/biological/nuclear weapons (it probably sounds like I am kidding about this - but I am NOT). Thank you for your rational/calm approach to this! Anything you might do to jam this CBer (like an oscillator to transmit an OC) would also jam the walkie talkies. 1. Change the channel the walkie talkies operate on, or 2. Replace them with walkie talkies using another band. I believe there are walkies talkies that also operate around 49 MHz. At this point I am still looking for LOW POWER jammer schematics. Although someone told me that some are on the way. Thank you for your information though, I appreciate it. |
Have you concidered the DS1086 Spread Spectrum Econoscillator from
dallas Semiconductors. A programmable Oscillator ( between 260Khz and 130Mhz ) with a selectable 'dither' of either 2% or 4% ) powered from a few AA cells would last a very long time and would sit nicely in the grass by the CBers Aerial and clutter up his comms very effectivly ;-) Very Tongue in cheek... Mike W -- On 06 Sep 2003 07:31:53 GMT, (Limitedselection) wrote: Subject: want circuit/schematic for CB "jammer" From: donut (Limitedselection) wrote in : Thanks - Mike posted about sky waves (I was unaware of), so even a very low power device centrally located in my property would apparently be heard world-wide - which is NOT what I want. I hardly think this would be a problem. For one, you'd need an antenna radiating a large proportion of skywave. Second, the CB bands are loaded with all kinds of open carriers, whistlers, music players, etc. so your tiny part in this would be unlikely to harm anyone. Donut, Thanks for the info. Earlier someone suggested using a mobile CB with a car battery and a magnet antenna and a garbage bag - and placing this as close to the neighbor antenna as possible. I think building a low-power jammer and placing it close to his antenna would be a better solution. Less expensive and totally disposable. You are one of the few people on Earth (well, at least on usenet - on usenet so far since I posted yesterday) that seems to think that this would be relatively harmless. Other people are equating asking for a jammer schematic to asking for information on manufacturing chemical/biological/nuclear weapons (it probably sounds like I am kidding about this - but I am NOT). Thank you for your rational/calm approach to this! Anything you might do to jam this CBer (like an oscillator to transmit an OC) would also jam the walkie talkies. 1. Change the channel the walkie talkies operate on, or 2. Replace them with walkie talkies using another band. I believe there are walkies talkies that also operate around 49 MHz. At this point I am still looking for LOW POWER jammer schematics. Although someone told me that some are on the way. Thank you for your information though, I appreciate it. |
I'm still confued. You want to keep from HEARING CB signals at YOUR
house? Why not just turn power off to your CB? Scott N0EDV Limitedselection wrote: From: (Mike W) You are talking about the groundwave, think about the skywave. I can assure you that even a low power jammer will be receivable over most of the world at some stage or other, depending on propagation conditions. Ah, I had not thought of that. Is there any way to ensure that did not happen? Locating the jammer inside the house? The angle of the antenna? Sheilding the jamming device? Only operating at certain times? I do NOT want to interfere with any reception (other than my own). -- Scott http://corbenflyer.tripod.com http://groups.yahoo.com/group/ParasolAirplanes Building RV-4 Gotta Fly or Gonna Die! |
I'm still confued. You want to keep from HEARING CB signals at YOUR
house? Why not just turn power off to your CB? Scott N0EDV Limitedselection wrote: From: (Mike W) You are talking about the groundwave, think about the skywave. I can assure you that even a low power jammer will be receivable over most of the world at some stage or other, depending on propagation conditions. Ah, I had not thought of that. Is there any way to ensure that did not happen? Locating the jammer inside the house? The angle of the antenna? Sheilding the jamming device? Only operating at certain times? I do NOT want to interfere with any reception (other than my own). -- Scott http://corbenflyer.tripod.com http://groups.yahoo.com/group/ParasolAirplanes Building RV-4 Gotta Fly or Gonna Die! |
The only problem with that is that CB is AM. As all pilots know, when
two AM transmitters come on frequency, you end up hearing both (and if one is a bit off frequency, a loud squeal as well). FM has the "capture" effect where you only hear the strongest one (ideally). Scott N0EDV Roy Lewallen wrote: Hm, that is an interesting problem. The trick would be to have a signal that's always considerably stronger at the walkie-talkies than the CBer's, regardless of where they might be in the house or on the property, but always considerably weaker than the signal from the other walkie-talkie. That won't be easy, if it's possible at all. Your best shot would be to use another walkie-talkie, because it would be directly radiating on the right frequency. It'd also be legal, for what that's worth to you. You'd need to reduce its signal output by shielding, cutting down the antenna, reducing the battery voltage, or some other means like stringing ferrite cores over the antenna. But I wouldn't bet on its accomplishing what you're trying to do, unless the CB interference is pretty weak. Reducing the walkie-talkie receiver sensitivity is another option, if the receiver is separately accessible internally and you know enough about such things to do it. But I think the best idea, suggested by another poster, is to contact the FCC. The law can, occasionally, be used to your advantage. Roy Lewallen, W7EL Limitedselection wrote: Roy, Thanks - Mike posted about sky waves (I was unaware of), so even a very low power device centrally located in my property would apparently be heard world-wide - which is NOT what I want. Actually, I did want to jam the reception of the existing CB signals on my property (at least in and around the house). One of my neighbors uses rather 'salty' language and the local kids use some walkie talkies around the house - I fugured that jamming the outside signals would still allow the kids to talk due to their close proximity. Thanks again. From: Roy Lewallen There's no way to make a signal stop at your property line, short of putting a perfect shield around your property. And if you did that, you wouldn't be bothered by your neighbor's CB anyway. -- Scott http://corbenflyer.tripod.com http://groups.yahoo.com/group/ParasolAirplanes Building RV-4 Gotta Fly or Gonna Die! |
The only problem with that is that CB is AM. As all pilots know, when
two AM transmitters come on frequency, you end up hearing both (and if one is a bit off frequency, a loud squeal as well). FM has the "capture" effect where you only hear the strongest one (ideally). Scott N0EDV Roy Lewallen wrote: Hm, that is an interesting problem. The trick would be to have a signal that's always considerably stronger at the walkie-talkies than the CBer's, regardless of where they might be in the house or on the property, but always considerably weaker than the signal from the other walkie-talkie. That won't be easy, if it's possible at all. Your best shot would be to use another walkie-talkie, because it would be directly radiating on the right frequency. It'd also be legal, for what that's worth to you. You'd need to reduce its signal output by shielding, cutting down the antenna, reducing the battery voltage, or some other means like stringing ferrite cores over the antenna. But I wouldn't bet on its accomplishing what you're trying to do, unless the CB interference is pretty weak. Reducing the walkie-talkie receiver sensitivity is another option, if the receiver is separately accessible internally and you know enough about such things to do it. But I think the best idea, suggested by another poster, is to contact the FCC. The law can, occasionally, be used to your advantage. Roy Lewallen, W7EL Limitedselection wrote: Roy, Thanks - Mike posted about sky waves (I was unaware of), so even a very low power device centrally located in my property would apparently be heard world-wide - which is NOT what I want. Actually, I did want to jam the reception of the existing CB signals on my property (at least in and around the house). One of my neighbors uses rather 'salty' language and the local kids use some walkie talkies around the house - I fugured that jamming the outside signals would still allow the kids to talk due to their close proximity. Thanks again. From: Roy Lewallen There's no way to make a signal stop at your property line, short of putting a perfect shield around your property. And if you did that, you wouldn't be bothered by your neighbor's CB anyway. -- Scott http://corbenflyer.tripod.com http://groups.yahoo.com/group/ParasolAirplanes Building RV-4 Gotta Fly or Gonna Die! |
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