Re: [time-nuts] Lucent RFTG-u REF0-REF1 cable

Just to close this one out, I was able to get the Ref-0 and Ref-1 working standalone with 10Mhz on both using my spare Motorola UT+ GPS. Lots of help from lots of people and especially Peter Garde who stuck with me to the end. It would be nice if all this was in one place or maybe one combined

Re: [time-nuts] Lucent RFTG-u REF0-REF1 cable

Is there an easy way to get 10Mhz out of the REF1? Next time I am using my electric screwdriver to take this apart. I can’t believe how many bolts it has. I used a screwdriver that turns double in reverse, pretty cool tool, but even then it took forever. > On Nov 15, 2017, at 7:00 AM, Bob

Re: [time-nuts] Lucent RFTG-u REF0-REF1 cable

Hi At some very basic level, the GPSDO needs to decide when to go into or come out of holdover. That decision often involves initial setup of the GPS module and subsequent monitoring of the module. The risk in swapping modules is always tripping over an obscure IF statement somewhere that does

Re: [time-nuts] Lucent RFTG-u REF0-REF1 cable

Am 15.11.2017 um 05:06 schrieb Jerry Hancock: problem solved. I also have to get the 10Mhz out of the REF1 but that looks easy. It is best to just double the 5 MHz that comes straight from the MTI-260 oven. <  http://www.hoffmann-hochfrequenz.de/downloads/DoubDist.pdf > regards, Gerhard

Re: [time-nuts] Lucent RFTG-u REF0-REF1 cable

: [time-nuts] Lucent RFTG-u REF0-REF1 cable Isn't info about what satellites are where, just eye candy and irrelevant to a real GPSDO? Tweaks to the elevation mask ought to be measurable in the PPS quality (if they aren't then they're irrelevant). Tim

Re: [time-nuts] Lucent RFTG-u REF0-REF1 cable

I can’t find the instructions on how to make the REF1 work without the REF0. Other than adding the 10Mhz, do I have to do anything to it to enable it to run without the REF0? > On Nov 14, 2017, at 7:52 PM, Tim Shoppa wrote: > > Isn’t info about what satellites are where,

Re: [time-nuts] Lucent RFTG-u REF0-REF1 cable

It turns out I don't have an M12+ in the TAPR GPS. I always knew I had an older model. I checked the numbers and pictures and it it just what I need, an Oncore UT+. So the first thing I need to do is get my REF1 standalone and then add this GPS to the REF0 and problem solved. I also have

Re: [time-nuts] Lucent RFTG-u REF0-REF1 cable

Isn’t info about what satellites are where, just eye candy and irrelevant to a real GPSDO? Tweaks to the elevation mask ought to be measurable in the PPS quality (if they aren’t then they’re irrelevant). Tim > On Nov 14, 2017, at 10:39 PM, Mark Sims wrote: > > The M12

Re: [time-nuts] Lucent RFTG-u REF0-REF1 cable

Mark, I went back and looked at the PDF from Peter and the Oncore GPS looks quite a bit like the M12+ I have. Peter mentions something about firmware in the Oncore. Anyone know if there would be an issue between using the Oncore and the 12+? If this works then I can just drop in my 12+,

Re: [time-nuts] Lucent RFTG-u REF0-REF1 cable

I remember seeing that pdf and thinking that the Motorola UT+ mounts look a lot like the Motorola 12+ and was wondering if would just fit. I'll go back and look. Thanks. On 15 Nov 2017 at 0:38, Mark Sims wrote: > There is also a nice pdf out there by Peter Garde that tells how to add a GPS

Re: [time-nuts] Lucent RFTG-u REF0-REF1 cable

Hi If you compare the PPS output of a simple GPS module (any of them) to a properly functioning GPSDO, you will see jumps in the module output. They are a function of the way all of the modules quantize the PPS signal. For higher resolution on the PPS you would have to use the sawtooth

Re: [time-nuts] Lucent RFTG-u REF0-REF1 cable

Thomas, Yes, thank you, I read the work Dan posted. I have this TAPR GPS with the M12+ board in it that I received for free after machining the end plates and the unused standby REF0 or REF1, can’t remember which has the GPS in it. I would like to have another 10Mhz standard in my office.

Re: [time-nuts] Lucent RFTG-u REF0-REF1 cable

Hi Jerry, the 15 MHz is disabled by default, just bridging some pins enables the output: http://syncchannel.blogspot.se/2015/11/denuo-gps-hits-rev-b-dongles.html If you want to insert some 1PPS signal to discipline it, you need some fake some GPS messages. Dan has done some nice work here, a

Re: [time-nuts] Lucent RFTG-u REF0-REF1 cable

Hi Just going by memory (never a good thing ….); You can make the GPS unit believe that it has a “slave” present *and* that the slave is not working properly. It’s all done with logic levels. In the “slave down” mode, the unit with the GPS puts out the 15 MHz and all the messages. The thing

Re: [time-nuts] Lucent RFTG-u REF0-REF1 cable

Bob, I thought you had to send it code, etc? I have the two units with cable, etc running upstairs. I want another one for in my office but the same guy only sells the REF0 and REF1 units separately now without the cable. I thought about splitting the two and using this other GPS unit I have

Re: [time-nuts] Lucent RFTG-u REF0-REF1 cable

Hi If you are going to get out the soldering iron, why simply make up a plug to run the GPS unit stand alone? Keep the second unit powered down as a set of spare parts….. Yes, it does depend a bit on what you are doing with them …. Bob > On Nov 13, 2017, at 11:50 PM, Jerry Hancock

Re: [time-nuts] Lucent RFTG-u REF0-REF1 cable

Yes, the cable is pretty easy, basically DB15 pin 1 to 15; 2-14; 3-13; 4-12; 5-11; 6-10; 7-9 and 8 to 8 followed by 9-7; 10-6; 11-5; 12-4; 13-3; 14-2; 15-1. If you do a search for "Lucent RFTG-U" and look around on time-nuts you will find it laid-out in a little more detail. I was just

Re: [time-nuts] Lucent RFTG-u REF0-REF1 cable

I need to make one, is there a schematic of the interface available? Dave Thompson > On Nov 13, 2017, at 22:50, Jerry Hancock wrote: > > Anyone have a spare cable for the Lucent setup? I guess I can make one with > some DB15 connectors but trying to skip the effort. > >