PrincessPi/Precision-Timekeeping-Fuckery
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i dont even know where i am currently :3

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Princess Pi
2026-03-28 08:28:39 -06:00
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10MHz-Reference-Sources.md
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# 10MHz Reference Sources
1. 10mHz (1ns period) OCOX (Oven Controlled) oscillator for beat time perhaps?
1. **investigate** state of the art **10mhz** and see if can **input** via clock/something else
2. check specs!
1. repeatability
2. reliability
3. margin of error
4. stability (time)
5. power input
6. signal output
1. connector
2. voltage
3. power
7. noise
8. operating temperature
9. square wave ideally?
3. check off TCXO **only use OCXO and DOCXO**
4. only use 10mhz reference sources
5. square wave ideally
6. output over gpio ideally
7. 3.3v/5v ideally
8. usb-c for power ideally
9. acquire ALL DA DATASHEETS
10. **MUST SUPPORT FREQUENCY DIVIDER down to 1MHz MAX**
11. **CAN DISCIPLINE GPSDO PPS IF SUPPORTED**
1. [One (aliexpress)](https://www.aliexpress.us/item/3256809505766372.html)
2. [Two (aliexpress)](https://www.aliexpress.us/item/3256810096296631.html)
3. [Three (aliexpress)](https://www.aliexpress.us/item/3256805803653257.html)
4. [Cheap Reference OCXO (aliexpress)](https://www.aliexpress.us/item/3256807112194740.html?spm)
5. [Quality Variable Reference OCXO (aliexpress)](https://www.aliexpress.us/item/3256808516082974.html)
6. [OCXO with atomic clock port, no reference?](https://www.aliexpress.us/item/3256804938971512.html)
7. [Cheap Ref 10mhz sma connectors low noise](https://www.aliexpress.us/item/3256808618867244.html)
8. [SMD OCXO 10mhz](https://www.aliexpress.us/item/3256809395237681.html)
9. [TCXO Ref 10MHZ 5V SQUARE WAVE 50ohm load required usb-c power](https://www.aliexpress.us/item/3256810530735650.html)
Grandfatherclock.md
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# Version 3
## To Figure Out
1. Details on the NEO-F10T/breakout
1. Battery
2. GPIO Pinouts
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1. pulse out/in (32kHz 31.25us period/10mhz 1ns period?)
3. [Pulsar Clock](Pulsar-Clock.md)
1. all daaat shit lmao
4. [10MHzReference Sources (If Needed)](10MHz-Reference-Sources.md)
5. figure out how to support Universal Beat Time to high precision
6. Boot up sequence
1. warm ups
2. get signals
3. run services with affinityies
4. check
## Hardware
1. [Raspberry Pi 5 16GB](https://www.adafruit.com/product/6125)
1. Raspberry OS Lite
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1. [Adafruit DS3231 RTC Precision I2C Breakout Module](https://www.adafruit.com/product/3013#tutorials) x1
[CR1220](https://www.adafruit.com/products/380) x1 (Battery)
7. [Gen 10 Timekeeping Specific GPS Module - NEO-F10T](https://gnss.store/collections/neo-f10t-timing-gnss-modules)
1.  
8. GPS Module
1. [Buy Varieties (Europe)](https://gnss.store/collections/neo-f10t-timing-gnss-modules)
1. Make sure **BATTERY** **TYPE** and **APPLICATION** is figured out
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### Wiring of Note
- CLK/PCM/GPIO18/PIN12:
- CLK in/out up to 10mHz (1ns period)
- ![9824306b308e6d2d21274a5bfe933c6b.png](../../_resources/9824306b308e6d2d21274a5bfe933c6b-1.png)
- ![9824306b308e6d2d21274a5bfe933c6b.png](../../_resources/9824306b308e6d2d21274a5bfe933c6b.png)
- only one i2c port?
- mostly all 3v3?
- PCM is kinda like DAC?