How can I reduce the signal range?

Any one know how to modify this so that you can adjust the range? Would simply adding a variable resistor to control the input voltage work? Or will I need an attenuator? If so, any ideas how?I would like to manipulate the existing range, not really extend it.

https://www.instructables.com/id/Modifying-a-Cheap-Portable-Cellphone-Jammer/?

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cell jammer6 years ago
The best way is to buy a cell phone signal jammer, i have used it for long time, it is really cool. i bought it from http://www.jammerall.com/, hope it can help you then.Try it now!
BearGrills6 years ago
You can put the less powerful signal amplifier there or totally remove it from the jammer. But in the second case signal will have very small range.
thegeeke6 years ago
This is illegal no matter how much you reduce the range. Part 15 of the FCC rules and regulations states that your device must accept any interference received; including that which may cause undesirable operation. Also, it may not cause any harmful interference. (Such as jamming a cell phone.)
+1. Businesses may be able to legally sell jammers, but that does NOT mean you can legally use them.
That's what I meant... sorry I didn't clarify.
elee186 years ago
I think there is a much easier way to solve the problem. You can just visit some jammer shops and buy a cell phone jammer then anything can be done. I know a site doing this business legally from Asian. The site is http://www.jammerall.com/ , maybe you can go and take a look. Their items are nice and of good price.
iceng6 years ago
Those antenna come in different groupings
Find the transmitting one and replace it with one that limits the power.

Or simpler put a chicken wire or hardware cloth around the transmitter
grounded at the output ref gnd.
You will have to experiment.

The reason you don,t want to reduce battery voltage is....
then the part of the Jammer that looks for the signal the unit needs as a target
will not work well and could get a US military satalite take you down !

A