Agreed. The trick is to properly partition what is done in hardware ane what is done in software. This could eliminate a lot of logic hardware.
Clearly, the RF stuff and modulator are hardware. Ditto PR code generation. Everything else in SW, I think. FWIW, -John =============== > 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. > > _______________________________________________ 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.
