2022年8月5日 · My architecture is inspired (among others) by thinkfat's DIY GPSDO project w/ STM32, TDC7200. However, I hope to improve on these aspects: However, I hope to improve on these aspects: Minimize digital processing of OCXO output.

2023年8月29日 · What I had to do was uncomment a compiler define for a screen. I initially tried enabling GPSDO_OLED, which seemed to sort of working but slowed the serial output down to once every 30 seconds to 1 minute. Not really useable but the averaging did seem to be working. So then I tried disabling GPSDO_OLED and enabling GPSDO_LCD_ST7735. Bingo!

2024年11月1日 · Apropos of just what can be achieved with a 'simple' G3RUH based gpsdo when using a ZED9FT receiver module, I've just posted an update on the latest progress with my pet RFS project along with a 12 hour run condensed into a two minute timelapse movie comparing the aforementioned gpsdo and the RFS along with an M8T based gpsdo and a 'spare LPRO ...

2024年4月9日 · > For proper GPSDO testing you'll need 3 units (2 known-good) and compare against each other using time interval counters. Or use a Cesium clock to be absolutely sure. Either way you'll need to measure over a 48 hour period so you have the GPS satellites fly in about the same formation over 2 times.

2020年4月14日 · Thanks Chris Edit: It looks llike whenn Lady Heather is switched from the NMEA mode to the ublox mode, the GPSDO switches also in the ublox mode and the run LED stops blinking. Switching back to NMEA mode in LH with /rxn will bring the unit back in the "normal" mode and the run LED starts bilking again.

2021年5月14日 · I uploaded to GitHub* Version v0.03e of the STM32 GPSDO firmware which implements a 64-bit counter (tested and working) and 64-bit ring buffers, and also provides a PWM signal with 16-bit resolution, which I still have to test and see whether it can be used instead of the 12-bit DAC, to control the OCXO frequency.

2022年12月21日 · This is all in the context of trying to figure out mathematically how much pps data you need to gather to achieve a certain GPSDO precision. Quote from: Gyro on December 21, 2022, 09:34:41 am Here's one I knocked together using a PLL and a …

2025年3月1日 · Unlike OCXO based GPSDO units, the TCXO based LB units lock and are ready to use in a minute or so. The ability to select almost any frequency you need is very handy. I use the LBE-1420 on 49.152 MHz to lock an Icom IC-9700 radio.

2017年8月12日 · -No standardized communication protocol like many commercial GPSDO’s-No display Why did I do this? Since about 2010 I have developed my GPSDO. It started just because I was lazy and tired of tweaking my 10MHz house standard. The only thing I am proud of is the 1ns resolution TIC. A couple of years ago I published an old version on the time ...

2023年3月28日 · Will be interesting to see pics of the inside of that - appearently it might be the same PCB as my GPSDO w/LCD (no dates on front/end of case), so wonder if it would be a 'simple' modification. Main PCB says: GNSS-D-OCXO(RB) 2021-06-10 Display board says: 20210527 And LCD says: BG7TBL V20220808 when powering up.