Some time back, I posted my experiments with a cheap Chinese made GPS jammer and Z3801. Since then, I have been able to check it on a spectrum analyzer. It sweeps over about 30 MHz centered on GPS L1 frequency. Power looks like about -3 dbM. If I turn it on within 30 feet of the antenna, the Z3801 goes into holdover immediately. Yesterday I tried it on my Garmin Nuvi and much to my surprise, the Nuvi is totally immune. Even with the antenna of the jammer touching the case of the Nuvi, it never lets on. I can only attribute this to different signal processing methods. Next up, my HTC G1 phone GPS.
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