Re: Rockwell GPS recievers

Thanks budgie, I was talking about the Jupiter bd. Another thought was will
it work without an antenna? I guess it will. I will be using it outside on
hill tops so should not have a problem a set of birds to lock on. I see an
output on pin 19 that is mark Epps that may be use to show a lock condition.


"budgie" <me@xxxxxxxxxxx> wrote in message
news:0f4qr1dfp7utbeoikpvi829qams9u300pg@xxxxxxxxxx
> On Thu, 05 Jan 2006 03:12:07 GMT, MetalHead
> <WanderingMetalHead@xxxxxxxxxxxxxxxxxx> wrote:
>
>>Chuck S. wrote:
>>> OK, one more question, do you need the RS-232 port if you only want to
>>> lock
>>> a vcxo to the 10kHz? My guess is no, just +5 volts and ground, and take
>>> the
>>> 10kHz from pin 20 of the connector.
>>
>>I have used the older Rockwell GPS stuff and they seem to need to have a
>>recent almanac transferred to them before they will get a fix. Rockwell
>>used to distribute a freebie software package that would help you deal
>>with all the setup stuff. It was called something like Lab_10 or Lab_X
>>or somesuch. The newer stuff may need less handholding.
>
> That's an interesting observation, Bob. I was watching the NMEA output
> from
> power-up on the Jupiter I am using doing a "frozen start" out of the box
> without
> an antenna. One sentence showed it checking each sat in turn. When it
> finds
> one (which it obviously doesn't do with no ant) it assigns a Rx channel#
> to it.
>
> When I finished play mode on the pooter end and connected an ant, it went
> through each bird in turn, about one per second. So within a minute it
> had
> acquired a set of birds and began processing. As I am using no form of
> backup,
> the Jupiter starts from ROM each time and does a similar "frozen start"
> i,e,
> factory almanac). It consistently achieves a full fix in under 3 minutes.


.

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