[time-nuts] Lecia L1 GPS chokering antenna voltage,

[Mark C. Stephens]

I contacted Leica Australia sales requesting help regarding the unknown "Leica GPS L1 Choke Ring" antenna Monday morning.
The sales person duly referred me to support and I had a call back within 30 minutes.

The support staff spent the entire morning assisting me to identify this antenna.
The support started with phone calls and was followed by an amount of email.

As you all know, getting information out of the big "3" in precision time and frequency has become a waste of time and frustrating.
I am happy to report, the staff at Leica Australia were enthusiastic, courteous, dedicated, knowledgeable and just plain helpful.
At one stage I had 5 different staff emailing me with updates.
We all seemed to have a common interest in precision timing and measurement.
I now have the data I need plus a whole lot more information I was not aware of before.

For instance, a warning was given that some of the antenna heads are sealed with nitrogen so be careful when opening them.
Please be mindful if opening a GPS antenna in future?

The Leica staff even attempted to find calibration data for my serial number.

This was all for a guy that walked in, off the street, The support service is fantastic and I now have great trust in Leica.

In future, when I am asked for a recommendation for precision geosystems or timing, 
I will have no qualms in recommending Leica, based on this great experience.


--marki

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of bg
Sent: Tuesday, 16 July 2013 7:38 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lecia L1 GPS chokering antenna voltage,

Good!

"N"  is supposed to go to north, yes! But for this antenna it does not matter... longer story below. 

This is used when you do phase differential stuff. Which usually means L1/L2 stuff and specifically antenna calibration data for az/el.

I cannot find any calibration data. 

http://www.ngs.noaa.gov/ANTCAL/Antennas.jsp?manu=AeroAntenna

http://www.geopp.de/index.php?bereich=5&kategorie=34&artikel=62

However if you look at the AT antennas at NOAA with a spike radome - I think the base chokering is the same as ours. Just a different antenna element in say the AT2775-43. For that antenna it matters!

I think the application for the AT575-90 was code differential dgps (marine DGPS) base stations. This service gives the users 1m:ish accuracy. Phase calibration is clearly <<10cm and not needed for basic code DGPS.

--
   Björn



-------- Originalmeddelande --------
Från: "Mark C. Stephens" <marks at non-stop.com.au>
Datum: 2013-07-15  12:13  (GMT+01:00)
Till: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Rubrik: Re: [time-nuts] Lecia L1 GPS chokering antenna voltage, 
 
Thank you, It is a AT575-90_G!

Now, On the bottom, there is an arrow labelled N.
I presume that is supposed to face north?

I can't tell you how ideal this antenna is for my application, outstanding!


Thank you again.
-marki

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of bg at lysator.liu.se
Sent: Monday, 15 July 2013 7:02 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lecia L1 GPS chokering antenna voltage,

Hi,

Is the antenna identical to this?

     http://www.aeroantenna.com/PDF/AT575-90_G.pdf

     http://ebookbrowse.com/at575-90-g-pdf-d359926216   (alternate link)

Do you have some pictures of the antenna? In particular the antenna element?

Aeroantennas of this vintage is usually "RG" which according to the spec above 5-18VDC. I recall having seen 4.5V as lower level to.

Modern antennas are usually good to 3.3 or lower. With vintage antennas this is much more uncertain.

--

     Björn

> I have been trying to find a datasheet for my Leica Antenna.
>
> All that is marked on the antenna is part number 10147.
>
> I want to find out what voltage range the preamp works off.
>
> Anybody have any idea?
>
>
> -marki
>
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