2021年5月14日 · 1. The use of a PLL, as in Lars' DIY GPSDO or in Brooks Shera original design from 1998 (or in many commercial GPSDOs), requires the use of extra components (ICs, capacitors, resistors), some of which may or may not require calibration and may or may not be temperature and supply voltage sensitive.

2017年8月11日 · I have built several complete GPSDO’s but now the only one I have running continuous is a rubidium based DIY Arduino GPSDO I use as a lab standard for my instruments. That Rb GPSDO has been running almost continuous for more than five years with different versions of my Arduino software.

2023年8月28日 · Re: Yet another DIY GPSDO - yes, another one « Reply #897 on: December 02, 2023, 11:39:15 pm » Thanks for the numerous and excellent suggestions, kff, I still have to set aside a few hourss to go through the code, but unfortunately other …

2018年8月7日 · Re: How to test a DIY counter and GPSDO « Reply #24 on: March 27, 2019, 03:50:29 pm » TimeLab allows you to read data in the csv format, and you may configure the TL parser in the setting window - for example whether your data is frequency, or a …

2022年3月21日 · Hello, I finally finished wiring my build of Lars' DIY GPSDO on a breadboard using an Arduino Uno clone. I turned it on a couple of hours ago, set the gain to 100 and am waiting now for the "Lock" status LED to come on.

2021年6月11日 · Re: Yet another DIY GPSDO - yes, another one « Reply #68 on: July 01, 2021, 12:46:19 am » I have everything but the black pill, which should arrive in a day or two.

2019年11月26日 · Re: DIY GPSDO project w/ STM32, TDC7200 « Reply #19 on: December 15, 2019, 11:58:48 am » For measuring the TDC7200 and the circuits around do not use 1PPS from an external source!

2021年8月8日 · In Lars' GPSDO and the STM32 GPSDO, this is a constant defined at compile time, in Erik's GPSDO this is a variable that "adapts" to the stability of the TCXO. When using an analog hardware control loop as in the Miller design and various old commercial GPSDOs, changing the corner frequency of the low pass filter requires changing an onboard ...

2022年4月16日 · One can notice that whatever type of oscillator is used, the stability of the GPSDO is bound by the intrinsic stability of the oscillator used until it intersects the GPS PPS Allan deviation, and by the GPS PPS stability after that point - just like any other GPSDO, including the Lars' DIY GPSDO or the STM32 GPSDO.

2021年6月3日 · Re: Yet another DIY GPSDO - yes, another one « Reply #35 on: June 05, 2021, 01:41:33 pm » Bob, I can if you want send you a Black Pill with the program flashed, but I can't really recommend that.