[time-nuts] 2201A GPS

Mon Apr 11 12:58:25 UTC 2011

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