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-boun...@febo.com [mailto:time-nuts-boun...@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 
<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
> > >
> > > _______________________________________________
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