# 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)