Hi One bit serial at 16 MHz isn't all that fancy any more. Sounds like a shift register feeding a couple filters.
The money must be in the receive side. Bob On Nov 24, 2010, at 5:14 PM, [email protected] wrote: > > > > Hi, > > found an interesting unit. I think it is not for the usual pocket money for > a time-nuts. > have a look... > > http://www.chronos.co.uk/pdfs/rac/labsat.pdf > > Rgds Ernie. > > > > > > > > > > -----Original Message----- > From: John Green <[email protected]> > To: [email protected] > Sent: Mon, Nov 22, 2010 6:43 pm > Subject: [time-nuts] GPS jamming susceptibility > > > Given that this is an extremely sensitive topic and completely illegal > lso, let me just state at the outset that I have no interest in > amming anyone's GPS. A while back, I was looking at one of those > hinese discount electronics websites, I'm sure we all have, and > oticed a GPS jammer for sale. I had been wanting to do some jamming > usceptibility testing for quite some time but had never got around to > uilding a generator to test with. The thing was cheap so I ordered > t. After it arrived, I opened it up, first thing, to see how it was > ade. It has a dual 555 oscillator, a couple of analog switches, a 1.9 > Hz VCO, a single amplifier. It doesn't look capable of putting out > ore than 50 milliwatts or so into a 2 inch antenna. I was somewhat > ubious that it would do anything, so I took it to the bench where the > 3801 lives and turned it on. Within 2 seconds, the holdover LED lit. > immediately turned it off and within a few more seconds, the > oldover LED was back off. The GPS antenna is perhaps 35 feet away > ith a cinder block wall, a brick wall, and a metal roof in between. I > lso put a 15 Db attenuator between it and the antenna with almost the > ame result. I am going to do more testing with it wired into the GPS > ownfeed an an adjustable attenuator in line just to see how much > ignal it takes. That way, there will be little danger of messing with > nyone's reception. It is just a simple sweeper so it must do its job > y brute force. I am amazed that it took so little to shut my Z3801 > own. Has anyone here had any actual experience testing GPS receivers > or susceptibility? > _______________________________________________ > ime-nuts mailing list -- [email protected] > o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > nd follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
