But I could not locate any supplier of a breakout module board with the M8T on it
for anywhere less than $100 USD. Where do you guys find a timing module on a breakout board that can actually be used without
doing your own wave soldering and PCB design?
You like it accurate, so you have to pay. If you need just a "frequency" you can set a cheap $US15 UBlox module output with UCenter.
I do not understand why you want to use an "High End Lars-Board" with the lowest quality pulse generator.
Contradiction in terms
See att
https://www.ebay.com/itm/1x-Ublox-LEA-6T-2-000-50-channel-15ns-1pps-Timing-GPS-module-WD22UGRC/313149500246?hash=item48e92a2b56:g:IR8AAOSwULhfEG5T
RE:
I do not understand why you want to use an "High End Lars-Board" with the lowest quality pulse generator.:-) :-) If you read a little higher, you may notice that I purchased both a Skytraq Venus838LPx-T Timing GPS module breakout,
AND the U-Blox M9N. The M9N is a very good enough receiver for hobby level work on my projects, and got here in days,
so I could play and learn while the Skytraq takes one month to arrive.
Some of us are "time-nuts" {tm}, but I am not. My personal goal for this project is to learn more about how a GPSDO
really works, learn time lab and lady heather, and compare the result to my $175 commercial GPSDO. If I wanted or
needed "Aerospace" level accuracy, I could indeed choose to rip the wallet wide open and spend spend spend. But I like
the idea of seeing if my parts spend can be less than or equal to the commercial unit, yet match or exceed it's performance.
Each person has a different reason. :-)
As far as accuracy for the $50 Skytraq Venus838LPx-T Timing GPS module:
The Venus838LPx-T module will provide PPS quantization error correction messages, allowing you to remove the quantization
error present on the PPS output. Without correcting this error, the PPS will have approx. ±6 ns of jitter.
Back to the non-timing and typically fake eBay U-Blox Neo-6 modules; They are more than good enough for
my GPS disciplined Wall Clock projects, where a human can't tell if you are half a second off;
https://nealix.zenfolio.com/img/s/v-10/p4012064259-4.jpghttps://nealix.zenfolio.com/img/s/v-10/p4012064258-4.jpghttps://nealix.zenfolio.com/img/s/v-10/p4012064260-4.jpghttps://nealix.zenfolio.com/img/s/v-10/p4012064255-4.jpgand finally, when I receive the Skytraq Venus838LPx-T Timing GPS module and can build Lars/PaulV's schematic,
this is what I wish to compare results to (The simple China BG7TBL GPSDO that uses FLL instead of PLL):
https://nealix.zenfolio.com/img/s/v-10/p4012055982-4.jpgand yes, accurate to half a Hertz is more than good enough for my amateur hobby needs.
So anyway, thanks again for putting up with another newbie here. But I am learning from you guys and having fun
at the same time. For that, huge thanks!
Cheers,
Neal