---
# System prepended metadata

title: Regular Meeting (2022.8.8)
tags: [Regular Meeting, DeWei]

---

# Regular Meeting (2022.8.8)

* Zybo-z7
* CDCFE Fanout Baord
	* Discussing cable(Measurement) solution between Fanout <-> FE

## 1 Zybo-Z7

Assemble initramfs

## 2 CDCFE Fanout Baord

### 2.1 From \[4 Layers\] -> 2 \[Layers\] (Reason: Cost)

|JetPCB, 2L/4L|欣興/2L|欣興/4L|
|-|-|-|
|![](https://i.imgur.com/Iivd5If.png)|![](https://i.imgur.com/DTD8MAH.png)|![](https://i.imgur.com/TSFt2D0.png)|

* Either JetPCB or 欣興, the price gap between 2L and 4L is too big 
	(but price gap between 4L/6L is normal)

### 2.2 [Spec.](http://tw.jetpcb.com/rule/capability.aspx) of PCM Manufactor(JetPCB)

* Finished layout
	* Smoothing edge of ground panel
	* ![](https://i.imgur.com/fYAmALG.png)
	* Also tried to place compoment on 1:1 sheet
		* ![](https://i.imgur.com/yZ8YSm4.png)
		* ![](https://i.imgur.com/fpBhtCW.jpg)

### 2.3 Cable's solution from Fanout-Board to OSC/CDCFE-Portotype

* Note: 
	* SMA-Plug: male
	* SMA-Jack: female
* We [present U.FL-SMA(Jack)\*2](https://uk.rs-online.com/web/p/coaxial-cable/7942894): price = 10 GBP
	* 
#### Sol1. \<Recommend\>

![](https://i.imgur.com/5iW5bbP.png)
* Well noise attenuated(Double Shielding)
* Diameter(1.32)
* Length: 10cm
* Price(digikey/NTD):
	* [SMA-Plug/SMA-Plug](https://tinyurl.com/5ebna78e): 28\*10 = 280 (5~10 DT)
	* [U.Fl to SMA-Jack](https://tinyurl.com/3nmp5tmp): 270\*2\*10 = 5400
	* Total = 6000
#### Sol2. 

![](https://i.imgur.com/NveAsf9.png)
* Single Shield
* Higher Diameter(1.37)
* Length: 20cm (Longer cable(may) damage quality of signal because of thin cable)
* Price(Mouser/NTD):
	* [U.Fl to SMA-Plug](https://tinyurl.com/285twp9e): 354\*10 = 2840
	* [U.Fl to SMA-Jack](https://tinyurl.com/2cb4zzm9): 284\*10 = 3540
	* Total = 6380

#### Sol3.  <Dr.Hsu recommend>

![](https://i.imgur.com/h3Lnq8m.png)
* Diameter(1.32)
* Double Shielding
* Length: 5 cm
* Using **probe** to measure
	* Distortion of probe
* **Lifetime** of U.FL **~30 times**, *Sol1* or *Sol2* should avoid this problem
* Price(Mouser/NTD):
	* [U.Fl to U.FL](https://tinyurl.com/sr64xvt7): 177\*8 
	* Lowest cost

### 2.4 RG-58/RG-316/RG-400(Replaces RG142 now) 

* Bentenz's experiment

| RG-58 | RG-400 |
| --- |--- |
| ![](https://i.imgur.com/lVQWDz9.png) | ![](https://i.imgur.com/1MqRyiv.png) |

* Price: 
	* RG58: 150NTD/1m
	* RG316: 300NTD/1m (present in lab521)
	* RG400: 440NTD/1m, 220NTD/0.5m
* Shield
	* RG58, RG316: Single
	* RG400: Double
* [RG-Series cables](https://en.wikipedia.org/wiki/Coaxial_cable#Standards)
* [RG-174/RG-178/1.13mm/1.32mm/1.37mm](https://www.data-alliance.net/blog/ufl-cables-coax-types-compared-113mm-132mm-137mm-rg174-rg178/)
* [Core Size of 1.13mm/1.32mm/1.37mm](https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=1-1773441-5_UMCC&DocType=DS&DocLang=English)
###### tags: `Regular Meeting` `DeWei`