Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module?
Am Samstag, den 17.08.2013, 23:05 -0500 schrieb Alan Kamrowski II:
Alan,
sent you the file by private mail. Note that serial data on this input
of the RFTG has to be ttl-level.
Have fun
Guido
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_putc('E');
checksum_putc('a');
checksum_putc(1); //month
checksum_putc(1); //day
checksum_putc(208); //year2 2000
checksum_putc(7);
checksum_putc(0); //h
checksum_putc(0); //m
checksum_putc(0); //s
checksum_putc(0); //frac40
checksum_putc(0);
checksum_putc(0);
checksum_putc(0);
checksum_putc(0); //lat4 0
checksum_putc(0);
checksum_putc(0);
checksum_putc(0);
checksum_putc(0); //long40
checksum_putc(0);
checksum_putc(0);
checksum_putc(0);
checksum_putc(0); //elip40
checksum_putc(0);
checksum_putc(0);
checksum_putc(0);
checksum_putc(0); //notused4 0
checksum_putc(0);
checksum_putc(0);
checksum_putc(0);
checksum_putc(0); //vel20
checksum_putc(0);
checksum_putc(0); //heading20
checksum_putc(0);
checksum_putc(0); //dop20
checksum_putc(0);
checksum_putc(0); //doptype 0
checksum_putc(12); //vissats 12
checksum_putc(8); //trackedsats 8
checksum_putc(0); //satid 0
checksum_putc(6); //trackmode sat time available
checksum_putc(0); //carrnoise
checksum_putc(2); //status using for time solution
checksum_putc(1); //2
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(2); //3
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(3); //4
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(4); //5
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(5); //6
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(6); //7
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(7); //8
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(32); //receiverstat 3d fix
txserial_putc(checksum);
txserial_putc(13);
txserial_putc(10);
Thanks,
Alan
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Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module?
Am Samstag, den 17.08.2013, 09:56 -0500 schrieb Alan Kamrowski II: Hi Guido, So you didn't fake the data from the UT, you only made something to ask the UT to output it. That´s exactly what I did, although I used the fake approach before that , when I didn't have a UT on hand. 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 in notebook computers or something that looks like SMA, but doesn't seem to have threads - push on??? Does the UT require a specific antenna? As has already been pointed out, no special antenna is needed as long as it's happy with a 5V supply. I believe I used a connector from a wifi-module of a laptop computer to put together an adapter. Aren't these called smc-connectors and come in normal and reversed fashion? Have fun, Guido ___ 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.
[time-nuts] Lucent RFTG-m-RB steered by Odetics GPStar
Hello and greetings to the list, I'm a new member and would like to report on my efforts in controlling the rubidium oscillator in the Lucent RFTG-m-RB module. I've been sifting through the time-nuts archives but haven't found any success stories on this apart from the original setup consisting of RFTG-m-RB and RFTG-m-XO. So maybe my experiences are of interest to those with a standalone RFTG-m-RB. In short, it seems to be possible to discipline the oscillator inside the module if pps signal and accompanying time tags are applied to socket J5. The pps should be of TTL level and the time tags must be of the form of the Motorola Oncore @@Ea... message. This message is described in the Oncore manuals so I won't go into it here. The time tags must go to pin 4 and the pps to pin 9 on J5. In a first approach, the pps was taken from an Odetics GPStar time and frequency system and the time tags were provided by a program running on a PC with a sufficiently accurate clock and piped out through the RS232 interface and a level converter. A few minutes after signals were applied, the NO GPS led went off, which I took for a hint that the setup wasn't completely idiotic. Also, pps signals from the RFTG-m-RB and the Odetics, which previously were apart several milliseconds, now followed each other by a 100 or so nanoseconds. Next I flashed a microcontroller board I had lying around, to poll the Odetics receiver for the necessary timing information and send it in Oncore message format to the Lucent module. The pps pulse from the Odetics receiver and a 10 KHz pulse train derived from the 10 MHz REF OUT were then observed on a TEK 2440 for several days. While before I applied the gps timing signals to the RFTG-m-RB, the 10 KHz pulses used to advance about 1.6 microseconds per day with respect to the Odetics pps, they now essentially stay where they are, apart for a wander of +/- 2oo nanoseconds during the course of a day. I would like to believe that this is an indication that the rubidium oscillator's frequency is indeed governed by the gps timing information. I'm now waiting for an Oncore UT+ receiver to arrive from China and will repeat the experiment with the original receiver. On the subject of the Odetics GPStar time and frequency system, I think I've seen a thread on this list last month where someone had several of them and was about to take them apart. I would like to buy one of those if possible. Also, I might be able to provide a bit of information on the programming interface as well as the the required antenna if someone is interested. Best regards Guido Kueppers ___ 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.
