Microwave Forum

richy_64 · Administrator Beiträge: 198

Hi,
i started to build a new GSM-900 jammer for personal defence...
The circuit is very similar to the S4-jammer, but significant smaller

ATtiny13 noise generator (no external parts needed)
MAX2623 VCO
PF01414A GSM-900 PA

Jamming range: 15-20 meters
Current drain: ~ 450 mA, so the li-ion accumulator lasts 2 hours.

There is just one problem: If i use a lambda/4 wire directly at the pa´s output, the pa always starts to swing (feedback...). That´s why i have to use an "external" antenna currently. In the small Nokia 6210 casing, some copper foil seems to be recommendable...

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Actual, this should be just a pre-stage to another project, a dual band jammer with QVC12 and PF08103.

Greetings,
richy_64

To be honest: I have never used such a device in public yet! - So why do i build them? - To see if i can get it working.

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"Ich liebe es, wenn ein (Schalt-)Plan funktioniert."