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
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
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
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
: [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
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,
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
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
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+,
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
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
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.
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
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
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
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
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
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.
>
>
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