Interesting then it would be some form of linear multiplier chain. Thats ugly for 750 Mhz. 75 X 10 or is it actually 1500 MC and its 10 X 50 X 3. It will be interesting to see what math was used.
On Fri, Apr 8, 2011 at 1:44 PM, Paramithiotti, Luciano Paolo S < [email protected]> wrote: > Correct, but again : no PLL is used due high phase noise introduced by it. > Monday I will be back home and I will take the manual. I can scan the > schematic for you > Luciano > > > Luciano P. S. Paramithiotti > IZ5JHJ > > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of paul swed > Sent: venerdì 8 aprile 2011 19.35 > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] 2201A GPS > > Rob you are correct but the 10 MC is a ref for the pll. > Luciano goes into more detail on the diode mixer/doubler and this makes > sense. It would be simple, but would not be very sensitive. So by feeding > the converter as he has with a modern antenna he gains a lot and most likely > a lower frontend noise floor. > All good things. > Luciano would like to see the schematic. > Regards > Paul. > > On Fri, Apr 8, 2011 at 12:55 PM, Rob Kimberley <[email protected] > >wrote: > > > From what I remember from my days at Austron, antenna had 10 Mhz LO > > and 75 MHz IF. > > > > Rob K > > > > -----Original Message----- > > From: [email protected] [mailto:[email protected]] > > On Behalf Of paul swed > > Sent: 08 April 2011 5:04 PM > > To: Discussion of precise time and frequency measurement > > Subject: Re: [time-nuts] 2201A GPS > > > > Luciano, > > The 750 may be made up by the use of a pll and then doubled to 1500. > > With the information I see they never went into any detail about the > > converter. > > Just maybe you have those details. > > Regards > > > > On Fri, Apr 8, 2011 at 11:08 AM, Paramithiotti, Luciano Paolo S < > > [email protected]> wrote: > > > > > Hi all, > > > I have an Austron 2200 with antenna. I think is the same antenna > > > used with 2201. Internally the converter is very simple to rebuilt > > > with patient and time to spend. From the mainframe you have DC > > > power, a 10 MHz fx to be multiplied for LO,and back the IF > > > frequency. In the antenna assembly is also present an rf > > > preamplifier and filter,a mixer > > and IF amp. > > > The more complex part is the multiplier and the LO and RF filter. > > > All other components can be replaced by mmic and minicircuits mixer. > > > If I well remember the LO mixer input is 1/2 fLO =750Mhz. > > > I have the manual but at the moment I am out of my laboratory and I > > > cannot verify it. > > > > > > Luciano > > > > > > Luciano P. S. Paramithiotti > > > IZ5JHJ > > > > > > > > > -----Original Message----- > > > From: [email protected] [mailto:[email protected]] > > > On Behalf Of paul swed > > > Sent: venerdì 8 aprile 2011 15.18 > > > To: Discussion of precise time and frequency measurement > > > Subject: Re: [time-nuts] 2201A GPS > > > > > > WT > > > Interesting there are at least 3 total people now that have the 2201. > > > All on time-nuts. > > > I have been working on my 2201 with the help of another time-nut and > > > home brewed the antenna/downconverter. But the way I did it is > > > really not reproducible. Unless you have a 1600 MC very stable > > > external lockable signal generator. Like a HP8660. > > > It does receive satellites. But it appears that the almanac is not > > correct. > > > There were several issues before the year 2000 and the 2201 was out > > > of production by the time the issues needed to be fixed. > > > I am still working on this. Slowly. Thanks to a fellow time-nut, I > > > may have an alternate down converter from odetics that can be > > > adapted perhaps to the 2201. > > > I was able to get the actual odetics system working last night for > > > the first time. I have had it less then a week and it was not that > easy. > > > But it is working. > > > So just maybe it can be recovered. Its quite a nice unit. > > > But at least for the moment even if you have the antenna its most > > > likely not going to work. > > > Regards > > > Paul. > > > > > > On Fri, Apr 8, 2011 at 12:03 AM, Wie Tan > > > <[email protected] > > > >wrote: > > > > > > > Hi; looking for Austron 2201A GPS antenna and manual. Please let > > > > me know; I am interested in purchased one. > > > > > > > > > > > > > > > > Regards > > > > > > > > WT > > > > > > > > _______________________________________________ > > > > 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. > > > > > _______________________________________________ > > 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. > > _______________________________________________ > 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.
