[time-nuts] TICC plots

[Mark Sims]

Here's an hour of Thunderbolt data... with labels for the xDEVs. On narrow screens only the 1-10-100-1000... divisions are labeled and not 1-2-5-10-20... Otherwise the longer labels run together.

I also enabled the PPS plot which is basically the PPS jitter.

The Star-4 PPS seems to be around 3 times better than the Thunderbolt PPS (and that's with an indoor antenna on the Star-4). It uses an LEA-5T + their highest spec 8663 DOCXO. I need to get a TADD-Mini to measure the 10 MHz.

[Chris Caudle]

On Sat, February 18, 2017 8:20 pm, Mark Sims wrote:
> The Star-4 PPS seems to be around 3 times better than the Thunderbolt PPS

I have not heard that product mentioned before. Are you referring to this
Oscilloquartz product?

http://www.oscilloquartz.com/files/1363163133-da_Star4.pdf

When I searched I found an old posting from last November from Mark
mentioning Star 4, but I don't remember a multi-week thread going on about
fine points of connector pin-outs, etc. like there have been for other
surplus GPSDO. Were there not many on the used market?
--
Chris Caudle




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[Mark Sims]

Yes, that is the board in the unit. It is boxed up by BG7TBL and sold on Ebay. It uses the highest spec ATDC version of the Star-4 with the highest spec 8663 DOCXO.

http://www.ebay.com/itm/10Mhz-GPSDO-OSCILLOQUARTZ-OSA-OEM-GPS-GPSDO-10MHz-1PPS-STAR-GPS-Clock-/262675973538?hash=item3d28b545a2:g:sbYAAOSwh2xYAjrp

Earlier versions brought out the Ublox receiver to the RS-232 connector. He now brings out the "management interface" so that Lady Heather can control and configure the device. I mod'd mine to bring out the management interface. There is also a software compatible NEC GPSDO (115200 baud). Both boards came out of WiMax systems in Japan.

So far I am rather impressed with it. The pk-pk jitter span on the 1PPS output is around 1/2 to 1/3 the Tbolts. Preliminary tests of ADEVS on the 1PPS seem to be around 50% lower.

I don't like the software interface. It is polled (like SCPI receivers) and getting consecutive time stamps is problematic. Heather does a lot of foo to patch them up. The NEC unit does not have the issue, probably due due to its higher baud rate.

BTW, ignore the adev data in that TICC plot. It is bogus. That message was meant for John Miles (not the list) to show the labeling of the ADEV plots... he had suggested that adev plot labels would be a good idea... he's usually right.

-------------------

I have not heard that product mentioned before. Are you referring to this
Oscilloquartz product?

http://www.oscilloquartz.com/files/1363163133-da_Star4.pdf
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