Wow thats a multiplier chain. The IF is reasonable and would easily be accomplished in 1 to 2 chips today. Though 2 would be good so you can add filtering and improve isolation. Thanks
On Mon, Apr 11, 2011 at 3:47 AM, Paramithiotti, Luciano Paolo S < luciano.paramithio...@hp.com> wrote: > more info for you: > > Input/output: > +15VDC > Diplexer for 10Mhz input for LO multiplier chain and 75.42 Mhz output to > receiver. > > The LO, 1500Mhz, is obtained from 10 Mhz standard coming from GPS receiver > as follow: > X3=30Mhz x5=150Mhz x5=750Mhz x2=1500Mhz. > > RF path 3 stage amplifier and filter for a total gain of 32dB (antenna is > passive right-hand circular polarization). > RF BW is 150Mhz > IF path 4 mmic stages and filter for a total gain of more/less 50dB. > IF BW is 20Mhz > This is a 1990 project. > > Luciano P. S. Paramithiotti > > > > -----Original Message----- > From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On > Behalf Of paul swed > Sent: domenica 10 aprile 2011 15.44 > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] 2201A GPS > > Rob understood what you meant. My comment was that the 1st mixer and local > oscillator is at 1500 Mhz. So the system has to multiply 10 MHz to 1500 and > mix it to produce the 75.42 MHZ IF. Luciano was saying it was a multiplier > chain and I was thinking out loud about the numbers that could have been > used. > Anyhow we will see what he adds to the discussion. > Regards > Paul. > > On Sun, Apr 10, 2011 at 4:02 AM, Rob Kimberley <r...@timing-consultants.com > >wrote: > > > Another thought - I know it was 75 MHz coming down, as they had some > > problems from interference from a VHF transmitter on one installation > > which was in that band. > > > > Rob K > > > > -----Original Message----- > > From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] > > On Behalf Of paul swed > > Sent: 08 April 2011 6:35 PM > > 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 > > <r...@timing-consultants.com>wrote: > > > > > From what I remember from my days at Austron, antenna had 10 Mhz LO > > > and 75 MHz IF. > > > > > > Rob K > > > > > > -----Original Message----- > > > From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] > > > 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 < > > > luciano.paramithio...@hp.com> 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: time-nuts-boun...@febo.com > > > > [mailto:time-nuts-boun...@febo.com] > > > > 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 > > > > <t...@westernengineeringent.com > > > > >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 -- 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. > > > > > > > > > > > > > > > > > > _______________________________________________ > > > 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. > > _______________________________________________ > 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.