[time-nuts] ublox chip sets - what GPS device should I buy?

Azelio Boriani azelio.boriani at screen.it
Fri Aug 31 19:02:58 EDT 2012


In my opinion it uses the NMEA sentences. For the purpose of recording
position and time, the NMEA is enough and usually the GPSes receivers
output by default the NMEA sentences. Of course you can't discipline
anything by the USB port, so the external 10MHz is mandatory.

On Sat, Sep 1, 2012 at 12:05 AM, David Kirkby <david.kirkby at onetel.net>wrote:

> On 31 August 2012 22:03, Bob Camp <lists at rtty.us> wrote:
> > Hi
> >
> > Are you thinking of hooking up an external GPS to the unit? I've never
> seen one of these VNA's so I'm a little in the dark.
> >
> > Bob
>
> The Agilent N9923A is a portable battery powered VNA to 4 or 6 GHz
> (depening on what option you have. It's only a software change).
>
>
> http://www.home.agilent.com/agilent/product.jspx?cc=GB&lc=eng&ckey=1760161&nid=-33903.922802.00&id=1760161&cmpid=zzfindn9923a
>
> I don't expect it to have the performance of a laboratory instrument,
> but it is a bit more usable for making measurements outside on an
> antenna. It will complement my HP 8720D, which covers 50 MHz to 20
> GHz, but it not portable.
>
> I don't have it yet, but bought it on eBay today from the seller
> "agilentused" which is Agilent, and sells used/ex-demo units which
> have been reconditioned, and have a fully warranty. Since I have not
> got it, I don't know much about it, but I have of course downloaded
> the manual.
>
> But from what I can work out, a USB stick plugs into the VNA and lets
> on record latitude, longitdude and altitude. The manual makes it clear
> the maps are not used, so there's no need to have the latest maps.
>
> The GPS can also be used to set the internal clock.
>
> One can adjust the frequency of the 10 MHz reference, but the VNA
> needs to be connected to an external 10 MHz reference to do this -
> there is no ability to use the GPS to set the frequency of the
> oscillator.
>
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