[time-nuts] 2201A GPS

Fri Apr 8 19:13:11 UTC 2011

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 <
luciano.paramithiotti at hp.com> 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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 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 <rk at 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-bounces at febo.com [mailto:time-nuts-bounces at 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.paramithiotti at 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-bounces at febo.com [mailto:time-nuts-bounces at 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
> > > <tech at westernengineeringent.com
> > > >wrote:
> > >
> > > > Hi; looking for Austron 2201A GPS antenna and manual. Please let
> > > > me know; I am interested in purchased one.
> > > >
> > > >
> > > >
> > > > Regards
> > > >
> > > > WT
> > > >
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