[time-nuts] 2201A GPS

paul swed paulswedb at gmail.com
Sun Apr 10 13:44:09 UTC 2011


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 <rk at 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-bounces at febo.com [mailto:time-nuts-bounces at 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
> <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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