From 51d096f856378683749486effceaa8fbe36a9496 Mon Sep 17 00:00:00 2001
From: PrincessPi3 <human.bagel@gmail.com>
Date: Sat, 28 Mar 2026 08:28:39 -0600
Subject: [PATCH] i dont even know where i am currently :3

---
 10MHz-Reference-Sources.md | 34 ++++++++++++++++++++++++++++++++++
 Grandfatherclock.md        | 15 +++++++++------
 2 files changed, 43 insertions(+), 6 deletions(-)
 create mode 100644 10MHz-Reference-Sources.md

diff --git a/10MHz-Reference-Sources.md b/10MHz-Reference-Sources.md
new file mode 100644
index 0000000..1562bdb
--- /dev/null
+++ b/10MHz-Reference-Sources.md
@@ -0,0 +1,34 @@
+# 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)
\ No newline at end of file
diff --git a/Grandfatherclock.md b/Grandfatherclock.md
index 7af2c4d..72d8d16 100644
--- a/Grandfatherclock.md
+++ b/Grandfatherclock.md
@@ -1,7 +1,5 @@
 # Version 3
-
 ## To Figure Out
-
 1.  Details on the NEO-F10T/breakout
     1.  Battery
     2.  GPIO Pinouts
@@ -15,6 +13,14 @@
 	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
@@ -40,9 +46,6 @@ sudo chrt -f -p 90 1234 # set pid 1234 to priority 90 (1-99  highest)
     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.  &nbsp;
-        
 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 
@@ -76,7 +79,7 @@ sudo chrt -f -p 90 1234 # set pid 1234 to priority 90 (1-99  highest)
 ### 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?