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
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
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 ala...@earthlink.net hat geschrieben:
Hi Guido,
Do you have any idea why the unit interprets the date 7168 (0x1c00) days into
the future? If I send
workaround of
this 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 ala...@earthlink.net hat geschrieben:
Hi Guido,
Do you have any idea why the unit interprets the date
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
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.com]
On Behalf Of Magnus Danielson
Sent: Thursday, September
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
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 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
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: [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 entire assembly
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
___
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
Hi,
Thanks guys - it locks and stays locked so I'm not going to mess with it for
now.
Alan
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and follow the instructions
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
Kamrowski II ala...@earthlink.net 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, it does
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
19001B001300160014000200050009
(Rx)@@Ea
081107E10C0100810900
19001B001300160014000200050009
On Thu, Aug 22, 2013 at 8:44 PM, Alan Kamrowski II
ala...@earthlink.netwrote:
Hi Everyone,
I'm converting a Neo 6M GPS data stream
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
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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
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time-nuts mailing list --
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,
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
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 for
Samsung Mobile gesendet
Alan Kamrowski II ala...@earthlink.net 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 a
second
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;
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:
http://www.ko4bb.com/Manuals/05%29_GPS_Timing/RFTG-m
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
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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
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
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 for
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
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 ala...@earthlink.net
wrote:
Hi Bob,
Is it 0.71 ppb off or 0.071 ppb off?
This is how I
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