[time-nuts] 2201A GPS

[Paramithiotti, Luciano Paolo S]

 Hi,
The multiplier is a classic analog harmonic distortion multiplier to avoid to add phase noise with a PLL.
The mixer is a two diode harmonic mixer, I suppose they use to drive it with 1/2 LO frequency due the old semiconductor thecnology available at the moment.
I have the complete manual with schematic. I have dismounted the converter board from the antenna assembly and placed it in one U rackmount box than in my time and freq rack. Th antenna input is connected via a  GPS antenna splitter to a classic patch antenna on the roof. 

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 18.04
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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