[time-nuts] Austron / Datum 2200 Antenna
paulswedb at gmail.com
Tue May 14 08:15:24 EDT 2013
I have succesfully built converters but not as you might suspect. I tapped
into a much later model GPS and up converted the IF signal to 75.42.
Essentially the 10 Mhz from the austron feeds what was the 10 Mhz of the
GPS rcvr. The same 10 Mhz is multiplied by 4 and mixed with the GPS rcvrs
35.42 to get the 75.42 for the Austron.
Alternately I used the Odetics converter and multiplied the 10 Mhz Austron
LO to 40 MHz to feed the Odetics converter.
All of that said. There a very nice chips today that have the PLL, VCOs,
mixers and such that really need pre-amplification and filtering and thats
about it. Not trivial but reasonable.
Unfortunately I will not have time to explore that option. But if someone
does go to the trouble to accomplish this I can tell you that the Austrons
perform very well. Pretty classy. Notice I stayed away from absolute
numbers. I would have to look them up.
On Tue, May 14, 2013 at 3:23 AM, mike cook <mc235960 at gmail.com> wrote:
> Le 14 mai 2013 à 09:02, Mark C. Stephens a écrit :
> > I have just scored myself the oddest looking Austron 2200 GPS Satellite
> > It's a 3RU chassis, the service manual I got from K04BB's excellent site
> seems to only describe the 1 and 2 RU.
> > Fortunately this comes with manuals which will be sent off to be scanned.
> > However, it didn't come with the antenna/down convertor.
> > I did a search of the time nuts history and apparently someone was
> offering these antenna for sale.
> > But it seems it was a dead end.
> don't know where this went, but:
> from the archives back in 2011 tvb said
> Hi group.
> I've been contacted by a helpful person who is willing to undertake
> "If I can get enough interest, there's a real possibility that
> better-than-original Downconverter Antenna Units for Austron
> GPS can be manufactured for me.
> Applies to all known Austron GPS Receivers such as 2200,
> 2200A, 2201, 2201A and variants.
> These units all send 15 volts and 10Mhz to the antenna unit
> which multiplies this and uses it to derive a local oscillator
> signal of 1500MHz in the antenna unit itself.
> 1575.42MHz - 1500 MHz = 75.42MHz which is sent back
> down the coax from the antenna unit to the gps rx.
> (All these receivers are useless without the downconverter
> antenna - and there have to be lots of 'em in the hands of
> time nuts)"
> If you have questions or are interested in participating, please
> > Failing one of the time nuts supplying me an antenna (anybody have a
> spare assembly they can sell me?)
> > How often do the 2200 type antenna come up on Ebay?
> > Many thanks,
> > mark
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