A lot of amatuer radio operators and RF engineers are telling me
that such a
device could wreak havoc world-wide

It won't "wreak havoc" world-wide, but it is very likely that it will
be heard on occasions long distances from your location - and it is
illegal. Even if your signal is only heard by your neighbor,
intestinally jamming him is not legal - even if what he is doing is
also not legal. On the technical side, it is just not possible to
generate a signal that will be strong enough to block his on your
property while ensuring that your signal will not leave your property.
It is not technically possible to control signal strengths (especially
given that your talkies will be moving around the property) to the
point that it will block the reception of his signal while letting
your signals through without interference when using the same
frequency.

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!

On Sat, 06 Sep 2003 00:34:59 -1000, Rick Frazier
wrote:

[snip]
Several days later, upon discovering a party at the house next door, the same
unnamed person invited himself in and had a conversation with the renter of the
house. It seems that for the first time in months, he had been able to actually
hear his stereo without trash talk emanating from it at odd hours, and was
celebrating, treating (most of) the block to a good size keg of beer. It seems
the CB neighbor had some sort of malfunction of a high power linear amp, and was
threatening to sue the place that sold him the amp because it had failed quite
spectacularly....

:-)
A heartwarming story. Thanks for sharing.
--

"I believe history will be kind to me, since I intend
to write it." - Winston Churchill

On Sat, 06 Sep 2003 00:34:59 -1000, Rick Frazier
wrote:

[snip]
Several days later, upon discovering a party at the house next door, the same
unnamed person invited himself in and had a conversation with the renter of the
house. It seems that for the first time in months, he had been able to actually
hear his stereo without trash talk emanating from it at odd hours, and was
celebrating, treating (most of) the block to a good size keg of beer. It seems
the CB neighbor had some sort of malfunction of a high power linear amp, and was
threatening to sue the place that sold him the amp because it had failed quite
spectacularly....

:-)
A heartwarming story. Thanks for sharing.
--

"I believe history will be kind to me, since I intend
to write it." - Winston Churchill

This one is tried and proven to be a winner. Start with some kind of mild
spark generator (large buzzer or mechanical bell). Isolate the device from
it's power source with a pair of chokes (and place in soundproof box). Feed
from the device(one lead to each side of spark gap or points) VIA 450Ohm
open ladder line to a dipole cut to the 11 Meter band and orient it in the
direction of the CB'ers antenna. This setup TRASHES AM and SSB RCVRS!!! I'ts
possible your neighbors might see some sparklies in their picture on the low
VHF channels. Want to make it REAL efficiant? take the CB radio you have and
put a COR on it's RCVR. Set it up without an antenna to his favorite
channel.When the COR closes it starts a time relay and transmits for about
10 minutes. Each time it hears the jerk it pops up and jams his RCVR.
This scheme will NOT work over 500 feet. If this guy lives next door or
behind you he IS game. He can not talk with someone ifhe can HEAR them to
begin with. Even the dumbest of animals will soon learn....Eddie

"Limitedselection" wrote in message
...
Help!

I want to effectively "jam" CB reception on my property.
The "jammer" would need to be low power and cover an area about as large
as a
'small' city block.

I have searched google, but I have only found references to schematics
that
were either posted to usenet as a picture (thus not saved in google
archives),
or located on web servers in domains that no longer exist.

Any information would be appreciated!

This one is tried and proven to be a winner. Start with some kind of mild
spark generator (large buzzer or mechanical bell). Isolate the device from
it's power source with a pair of chokes (and place in soundproof box). Feed
from the device(one lead to each side of spark gap or points) VIA 450Ohm
open ladder line to a dipole cut to the 11 Meter band and orient it in the
direction of the CB'ers antenna. This setup TRASHES AM and SSB RCVRS!!! I'ts
possible your neighbors might see some sparklies in their picture on the low
VHF channels. Want to make it REAL efficiant? take the CB radio you have and
put a COR on it's RCVR. Set it up without an antenna to his favorite
channel.When the COR closes it starts a time relay and transmits for about
10 minutes. Each time it hears the jerk it pops up and jams his RCVR.
This scheme will NOT work over 500 feet. If this guy lives next door or
behind you he IS game. He can not talk with someone ifhe can HEAR them to
begin with. Even the dumbest of animals will soon learn....Eddie

"Limitedselection" wrote in message
...
Help!

I want to effectively "jam" CB reception on my property.
The "jammer" would need to be low power and cover an area about as large
as a
'small' city block.

I have searched google, but I have only found references to schematics
that
were either posted to usenet as a picture (thus not saved in google
archives),
or located on web servers in domains that no longer exist.

Any information would be appreciated!

Here is an interesting idea. A guy could use a 555 timer chip to make a
circuit that would literally key up in the guys face every time he keyed his
rig, by connecting the trigger input on the timer chip to the signal from
the s-meter , which is filtered dc. the amount of time it would key up for
could be set by the timing interval of the chip . Now, we simply turn the
sensitivity of the receiver down, and turn the power output down also on
transmit. this means a 12- volt car battery could run this setup for a
loooong time. The receive sensitivity is turned down until only strong local
signals produce enough s-meter output to trigger the chip into keying the
rig up. This ensures that it only keys on him, since you will place this
somewhere near his residence.
A friend of mine did this with great success, since he took a regular
breaker box, and mounted it on a light pole near the guy's house, along with
a bunch of other boxes that were on the pole already, and ran a 9-foot wire
up the pole. It was quite a while before the power company discovered the
'superfluous" box on the back of the light pole, long after it had served
its purpose well. the 12- volt car battery that ran it lasted over a month
with this setup............. total cost ? it might have cost two or three
dollars to make the circuit on a piece of perfboard...

"Caveat Lector" wrote in message
news:iF36b.28605$S_.20371@fed1read01...
Golly -- FYI:
Jamming is illegal -- subject to an FCC fine

--
73 From The Signal In The Noise
Caveat Lector Ya All
"Limitedselection" wrote in message
...
Help!

I want to effectively "jam" CB reception on my property.
The "jammer" would need to be low power and cover an area about as large
as a
'small' city block.

I have searched google, but I have only found references to schematics
that
were either posted to usenet as a picture (thus not saved in google
archives),
or located on web servers in domains that no longer exist.

Any information would be appreciated!

Here is an interesting idea. A guy could use a 555 timer chip to make a
circuit that would literally key up in the guys face every time he keyed his
rig, by connecting the trigger input on the timer chip to the signal from
the s-meter , which is filtered dc. the amount of time it would key up for
could be set by the timing interval of the chip . Now, we simply turn the
sensitivity of the receiver down, and turn the power output down also on
transmit. this means a 12- volt car battery could run this setup for a
loooong time. The receive sensitivity is turned down until only strong local
signals produce enough s-meter output to trigger the chip into keying the
rig up. This ensures that it only keys on him, since you will place this
somewhere near his residence.
A friend of mine did this with great success, since he took a regular
breaker box, and mounted it on a light pole near the guy's house, along with
a bunch of other boxes that were on the pole already, and ran a 9-foot wire
up the pole. It was quite a while before the power company discovered the
'superfluous" box on the back of the light pole, long after it had served
its purpose well. the 12- volt car battery that ran it lasted over a month
with this setup............. total cost ? it might have cost two or three
dollars to make the circuit on a piece of perfboard...

"Caveat Lector" wrote in message
news:iF36b.28605$S_.20371@fed1read01...
Golly -- FYI:
Jamming is illegal -- subject to an FCC fine

--
73 From The Signal In The Noise
Caveat Lector Ya All
"Limitedselection" wrote in message
...
Help!

I want to effectively "jam" CB reception on my property.
The "jammer" would need to be low power and cover an area about as large
as a
'small' city block.

I have searched google, but I have only found references to schematics
that
were either posted to usenet as a picture (thus not saved in google
archives),
or located on web servers in domains that no longer exist.

Any information would be appreciated!