Merge pull request #76 from carabidulebabat/patch-2

Update APFPV.md

Author: BlackFox-org

src/content/docs/use-cases/fpv/APFPV.md

@@ -389,58 +389,68 @@ nmcli device disconnect wlan0
 
 Thats all, now put the SD card in your vrx and turn it ON, you will get 2 wifi interfaces connected to APFPV credentials, and with ip route it will pick the best wifi card every time, the range should increase significantly.
 
-### Using APAlink 
-APAlink will modify the bitrate on the fly to keep link alive, it still on exprimental stage, use on  your own risk! 
- 1. Download it from [GitHub](https://github.com/carabidulebabat/CaraSandbox/blob/main/ap_alink.sh).
- 2. Modify rc.local in /etc/ folder and add before exit 0 and save the file.
-```bash
-/etc/ap_alink.sh &
-````
- 
- 3. SSH into it(putty can be used) and type:
+Using APALink
 
-```bash
-chmod +x /etc/ap_alink.sh
-```
+APALINK is a C program designed to keep your video link alive. It uses fallback logic to switch to a lower bitrate (e.g., 2 Mbps) when the signal is weak.
 
-Now lets see the different setting, cause its experimental we can play with various parametrer
+Installation
 
-bitrate=30 is the default bitrate, when its boot it will start at 30mbps
-bitratemax is the max bitrate allowed, majestic will not go higher than this value
-default value is bitrate 30 and max 40, its good if you have a radxa gs with good wifi card, if your on android try lower value like
+To install it is easy:
 
-```bash
-bitrate=4
-bitratemax=10
-````
+1. Go to https://github.com/carabidulebabat/CaraSandbox  
+2. Follow the steps in the README.md.
 
-Power output is not adaptive yet. 
-```bash
-get_dynamic_interval() {
-    dbm=$(get_dbm)
-    echo $(awk -v d="$dbm" 'BEGIN {
-        if (d > -40)      print 8;
-        else if (d > -65) print 6;
-        else if (d > -75) print 4;
-        else if (d > -85) print 2;
-        else              print 1;
-    }')
-}
-```
-This function allows to increase the bitrate faster or lower depends on link quality in dbm. You can modify the d value to set the sensitivity of APAlink.
-```bash
-get_dynamic_decrease() {
-    dbm=$(get_dbm)
-    echo $(awk -v d="$dbm" 'BEGIN {
-        if (d > -60)      print 2;    
-        else if (d > -75) print 5;  
-        else if (d > -85) print 15;    
-        else              print 20;    
-    }')
-}
-```
-Same thing as get dynamic interval, but it will lower bitrate faster or lower depends of link quality.
+3. Copy the ap_alink binary to /usr/bin:
+
+'''bash
+chmod 777 +x /usr/bin
+'''
+
+4. Copy the ap_alink.conf file to the /etc/ folder.
+
+5. (Optional) Copy vtxmenu.ini to /etc/ as well to enable the APFPV menu.
+
+6. Go fly!
+
+Settings
+
+You can edit the ap_alink.conf file:
+
+'''bash
+bitrate_max=22 ## its the bitrate when good signal
+bitrate_min=2 ## its the fallback bitrate
+dbm_threshold=-47 ## this value is the threshold of when fallback mode needs to kick in. WARNING: set this value as your Wi-Fi RF sensitivity
+'''
+
+- A lower threshold = better image quality for longer, but video may lag or freeze under weak signal.
+- A higher threshold = fallback triggers faster, possibly reducing lag but also image quality.
+
+Recommended Settings
+
+EU2:
+'''bash
+bitrate_max=12
+bitrate_min=2
+dbm_threshold=-52
+'''
+
+8812AU AF1:
+'''bash
+bitrate_max=10
+bitrate_min=2
+dbm_threshold=-48
+'''
+
+MSP Menu
+
+Navigate to the MSP menu just like in HDZero or WFB-NG.
+
+Inside the "BASIC SETTING" submenu, you have:
+
+- Tx Power: 1500 or 2000 (representing MIN/MAX power). 25mw or 100mw.
+- Channel: Every 5GHz Wi-Fi channel is listed.
+- AutoPower 0 or 1 enable set tx power auto of iw
 
-I suggest to try different value for d > dbm and see in flight.
-You can killall ap_alink.sh and type sh /etc/ap_alink.sh to execute script with log, log will show current bitrate, interval and dbm. Thats all for APAlink at the moment
+That’s All
 
+Straightforward, easy to understand — just plug and fly without overthinking.