Hi It's not real clear that they do anything more than sample the RX and play it back for the TX.
Bob Sent from my iPhone On Nov 25, 2010, at 9:39 AM, "J. Forster" <j...@quik.com> wrote: > 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, erniepe...@aol.com 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 <wpxs...@gmail.com> >>> To: time-nuts@febo.com >>> 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 -- time-nuts@febo.com >>> o unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> nd follow the instructions there. >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
