Hi Everyone,
My GPSDO has been running for about a month now and the last frequency
adjustments are:
09/24/2013 15:48:37
1301186
Freq
1.0484E-13
09/25/2013 15:53:26
1387875
Freq
4.7980E-13
09/30/2013 16:17:26
1821315
Freq
-2.2965E-13
10/04/2013 16:36:38
2168067
Freq
-3.24
Hi,
So I've had my RFTG with a LPRO in it running for 2 weeks and it has made
various corrections along the way:
Time
Elasped
Change Type
Change
09/09/2013 14:22:11
0
Power On
09/13/2013 14:55:40
347609
Freq
-2.0524E-13
09/14/2013 15:00:30
434299
Freq
-7.9048E-14
Hi Everyone,
I've had some fun and learned quite a bit trying to get my Lucent RFTG
rubidium module to discipline itself to a GPS module. It has an interesting
way of doing this that I'm not sure is the best or the worst, but it is
constantly figuring out an average phase error between the gps
t; 7168 is dividible by 7 and the result is 1024. You know the gps week wraps
over from 1023 (0x3ff) to 0.
> Perhaps what you see is the consequence of some software workaround of
this problem, in other words the RFTG thinks a gps week rollover must have
happened and tries to correct the date.
&g
problem, in other words the RFTG thinks a gps week rollover must have happened
and tries to correct the date.
Have fun
Guido
Von Samsung Mobile gesendet
Alan Kamrowski II hat geschrieben:
Hi Guido,
Do you have any idea why the unit interprets the date 7168 (0x1c00) days into
the future? If
Hi Everyone,
http://www.ko4bb.com/Manuals/05%29_GPS_Timing/RFTG-m/RFTG-m-rb_L105A_Hi_res/
lucent%283%29.jpg
I'm trying to figure out where the RFTG gets its Rb module temperature and I
think it has to be on the board above most likely in the upper left. The
cutout is where the RB module is
Magnus
On 09/06/2013 12:53 AM, Alan Kamrowski II wrote:
> Hi Magnus,
>
> Interesting. What temperature C do you use and for how long?
>
> Thanks,
>
> Alan
>
>
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.c
Hi,
Curiously why is the Rb bulb designed the way it is? Having an open area in
the base where a contact would normally be? What is the purpose of that?
Also, does it have one conductor or two? If so, how? I only see the
base...
Thanks,
Alan
___
: [time-nuts] LPRO questions...
On 09/05/2013 10:45 PM, Alan Kamrowski II wrote:
> Hi Bill,
>
> Where is the dimple? The bulb end looked circular and smooth? Do you
> mean the other end (back end which is visible even when the bulb is
installed)?
> The bulb end points towards the
Hi Bill,
Where is the dimple? The bulb end looked circular and smooth? Do you mean
the other end (back end which is visible even when the bulb is installed)?
The bulb end points towards the entire assembly...
Thanks,
Alan
___
time-nuts mailing list
Hi,
Well, I had it apart so I went ahead and tried the heating process on the
lamp. I don't see any splattering on the lamp at all of purple material,
but I added some masking tape to the threads and put it in a drill to rotate
it. I hit it with a hot air station at 350 deg C and rotated it for
Hi,
Thanks guys - it locks and stays locked so I'm not going to mess with it for
now.
Alan
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Hi,
I've got an LPRO and my Rb lamp voltage is 3.5608V. I've read about bulb
rejuvenation. I've looked through some of the repair manuals, but still
have a few questions.
#1 - how do you remove the cover? Is it just press fit into place? I see
dimples on it and I wonder can I just pry t
ung Mobile gesendet
Alan Kamrowski II hat geschrieben:
Hi Guido,
Do you have any idea why the unit interprets the date 7168 (0x1c00) days into
the future? If I send it today's date in the correct Motorola format, this is
how many days it adds to it. If I change the date to try another,
Hi Guido,
Do you have any idea why the unit interprets the date 7168 (0x1c00) days into
the future? If I send it today's date in the correct Motorola format, this is
how many days it adds to it. If I change the date to try another, it does the
same thing. Any idea why? I can correct for it
810900
19001B001300160014000200050009
(Rx)@@Ea
081107E10C0100810900
19001B001300160014000200050009
On Thu, Aug 22, 2013 at 8:44 PM, Alan Kamrowski II
wrote:
> Hi Everyone,
>
>
>
> I'm
Hi Everyone,
I'm converting a Neo 6M GPS data stream to the Motorla Oncore UT data stream
my RFTG expects. When first turned on the 6M doesn't have a 1pps signal
yet, but does post NMEA messages which lack data are invalid. My question
is, what does the binary data stream from a Motorola Onco
Hi Guido,
>yes it worked. I'll have to look through my software projects and send you the
>source file.
Please do, so far my attempt is just failing.
I'm trying to send:
//transmit gps data
txserial_putc('@');
txserial_putc('@');
checksum=0;
checksum_put
fun,
Guido
Von Samsung Mobile gesendet
Alan Kamrowski II hat geschrieben:
Hi Guido,
>That´s exactly what I did, although I used the "fake" approach before that ,
>when I didn't have a UT on hand.
Was that successful? If I could just output the same data stream to it once
Hi Bob,
>All the UT cards that I have ever seen use the small push on antenna
connector.
>I have never seen one that directly takes anything "normal" like an SMA or
a BNC.
>You buy the card and then a bit of coax with the push on on one end and
>(normally) an SMA on the other end.
>The antenna
Hi Guido,
>That´s exactly what I did, although I used the "fake" approach before that ,
>when I didn't have a UT on hand.
Was that successful? If I could just output the same data stream to it once a
second with the pulse from an AVR or something that would be great. Do you
still have this s
Hi Guido,
So you didn't "fake" the data from the UT, you only made something to ask the
UT to output it.
I see some UT units on eBay, but I don't recognize the antenna connectors.
I've got a small screw on antenna (SMA?), but the ones on eBay look like that
small round push on like I've seen
Hi Guido,
I found a manual here:
http://www.elgps.com/public_ftp/Documentos/SIRF_Protocol.pdf
I don't see the @@Ea.. sequence anywhere. Is it NMEA or SIRF Binary?
Any more tips before I try this?
Thanks,
Alan
___
time-nuts mailing list -- tim
Hi Guido,
>the one I used was a Oncore UT.
>The message needed for the RFTG is @@Ea..
So if I send the bytes: "@@Ea.." it will accept the 1pps pulse?
Any idea on the baud rate, 9600 N 8 1 ?
Thanks for your help
Alan
___
time-nuts maili
Hi Brian,
>Just did this. Less than 0.005 Hz.
Thank you - was clockwise 0.005 higher or lower?
My Rb is about 0.000731284 fast according to my estimate.
>To really fine tune it, you need to used the C-field adjustment pin.
>This circuit is simple. A Linear Technology LT1236 precision 5V regul
Hi Everyone,
I'm going to try to calibrate my LPRO 101 to a GPS 1pps signal.
Does anyone know what "one turn clockwise" of the c field adjustment pot
will do to the signal in terms of ppb ?
Thanks,
Alan
___
time-nuts mailing list -- ti
race out some of the circuits, I found that the EFC on the
LPRO connector was not being used at all.
On 8/15/2013 7:52 AM, Alan Kamrowski II wrote:
> Hi Everyone,
>
>
>
> I've only got the RFTGm-II-Rb module. I found an interface cable
> specification here:
>
>
measurement
Subject: Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the
XO module?
Hi
Must have blinked counting all the zeros ..
Bob
On Aug 15, 2013, at 6:36 PM, "Alan Kamrowski II"
wrote:
> Hi Bob,
>
> Is it 0.71 ppb off or 0.071 ppb off?
>
> Th
Hi Bob,
Is it 0.71 ppb off or 0.071 ppb off?
This is how I calculated it:
13939010/13939 = 1000.000717411579022885429371
answer/1000 = 1.00717411579022885429371
answer-1 = 7.1741157902288542937083004519693e-11
answer*1e9 = 0.071741157902288542937083004519693
Thanks,
Alan
Hi Rex,
>I don't think the rubidium module for these systems can be disciplined.
>I think they were only intended as a backup if the XO section or GPS
failed.
>The XO section does discipline but I don't know the details.
I was hoping since the rubidium module had a light for GPS and an input fo
Hi Everyone,
I've only got the RFTGm-II-Rb module. I found an interface cable
specification here:
http://www.ko4bb.com/Manuals/05%29_GPS_Timing/RFTG-m/RFTGm%20Interface%20Cab
le.pdf
Does anyone know if feeding a 1pps signal to pin 9 might discipline it? Or
does it need the other conne
31 matches
Mail list logo