mobile (cell) phone jamming

Tarapia Tapioco · 2003-12-19T16:57:28+00:00

I want to build a mobile phone jammer* short range (not more than 5 yds)* handheld, small* battery poweredso that when I'm on the bus/train and some idiot start loudly talkingabout his business, I can press a button and cause just enoughinterference to disconnect him mysteriously.It would be better if it had some directionality but not too much. Idon't want to aim it at someone but it would be nice to be able todisconnect the loud phone user in front of me without affecting thetext messager behind me.Can anyone point me in the right direction for designing this?

Dec 19, 2003 42 Replies

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Zak 22 years ago

Well, if you build a PLL it should not be too hard to keep it running in the channel for the moments that the reference signal is off.

Thomas

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Steve Terry 22 years ago

Shouldn't need the complexity, phones only just manage not RX their own TX

45MHz away under normal conditions

Steve Terry

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Gordon Brown 22 years ago

the

The GSM downlink and uplink bursts are spaced 3 burst periods apart, with the downlink burst occurring first. This means that (in the case of frequency hopping enabled) the GSM mobile will be receiving and transmitting on Channel A before moving on immediately to a different channel from its next reception and transmission. In this case, I doubt such a simple "delayed-feedback-interferer" would actually jam a GSM mobile station in practice under normal conditions .

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