[ntp:questions] Good and cheap GPS receivers (was: Reference clocks - which?)
helmut at wollmersdorfer.at
Sat Oct 30 11:42:56 UTC 2004
Tapio Sokura wrote:
> Richard B. Gilbert wrote:
>> A Motorola Oncore M12+T GPS receiver is available from Synergy Systems
>> for around $200US. This is far better than what you say you need.
The evaluation kit is around USD 750. I did not see, where I can order
the necessary parts for around USD 200 on the above site.
> They also have used, but fully functional Oncore VPs for sale for
> something like 30-40 USD (see the excess inventory link on the front
> page). In addition to the GPS itself you need a suitable antenna and
> power supply along with 5 volt regulation and a max232 circuit for
> serial port level conversion.
Yes, but the minimum order is USD ~70. So I would need to order two
pieces. And I would need to have suitable antennas too.
> Anyway, a GPS synchronized time server can be built for considerably
> under 100 USD, not counting the PC itself.
I would like to have one or two GPS receivers, independant from my DCF
receivers and maybe more accurate. USD 100 - 200 for one will be o.k.,
taking into account, that I have max232, 78L05 and other stuff on stock.
As the only possibility in my location is to mount a small, weatherproof
antenna/receiver to the _vertical_ frame of window, giving a view of
approximately 60 by 80 degrees to sky, covered around 50% by trees, I am
not sure, how good the GPS signals will be.
Buying a GPS mouse first, to avoid waste of money, will be a
possibility, because I could use a GPS mouse for other purposes. But
which one? Is there any known GPS mouse/chip set working "plug and play"
As my location is in Austria/Europa shipment from US and other
additional costs are not unimportant.
More information about the questions