ALFA AWUS036ACS — Pocket-Size Dual-Band AC433
一句話定位（One-liner）: The AWUS036ACS is the 55 mm pocket ALFA — an RTL8811AU AC433 dual-band adapter with two fold-out 5 dBi antennas and DKMS-driven monitor mode. It is the adapter you carry because "you never know when you will want to look at some Wi-Fi."
規格總覽 (Spec overview)
| Item | Spec |
|---|---|
| Chipset | Realtek RTL8811AU |
| Wi-Fi class | AC433 (150 + 433 Mbps) |
| Interface | USB 2.0 |
| Bands | 2.4 + 5 GHz |
| Antenna | 2 × external 5 dBi, RP-SMA |
| Body | ~55 mm — pocket sized |
| Linux driver | rtl8811au (DKMS, not in-kernel) |
| Monitor mode | ✅ good |
| Packet injection | ✅ good |
Overview
The ACS is what happens when you shrink the classic ALFA formula without losing the essentials. It keeps dual-band, external antennas and working monitor mode, but wraps them in a 55 mm body that vanishes in a laptop bag. Its 1×1 RTL8811AU radio is AC433-class — enough for management-frame capture, injection demos and light analysis, and honest about its throughput limits.
The trade-off mirrors the other Realtek ALFAs: the driver is not in the kernel, so there is a one-time DKMS build (which handles kernel updates for you afterward). If you would rather have zero driver work, spend a little more on the in-kernel AWUS036ACM.
Install & drivers
Full details on the RTL8811AU driver page. The short version:
cd /opt && sudo git clone https://github.com/aircrack-ng/rtl8811au.git
cd rtl8811au && sudo make dkms_install
sudo modprobe 8811au
Expected output: DKMS: install completed. then an interface in iw dev.
Advanced usage
Monitor mode on the road
sudo airmon-ng check kill
sudo airmon-ng start wlan0
sudo aireplay-ng --test wlan0mon
Expected output: wlan0mon + 30/30: 100%.
Travel rig
Pair the fold-out antennas (they stay attached in transit) with a Jetson or laptop for a portable capture/analysis station. Fold the antennas, drop it in the pocket, done.
Compatibility
| Platform | Support | Notes |
|---|---|---|
| Kali Linux | ✅ | DKMS; aircrack-ng repo |
| Ubuntu | ✅ | DKMS |
| NetHunter / Android | 🔧 | Realtek, so not guaranteed |
| Windows | ✅ | Official driver |
| Raspberry Pi / Jetson | ✅ | DKMS build on ARM64 |
Troubleshooting
| Symptom | Cause | Fix |
|---|---|---|
| DKMS build fails | Missing headers / new kernel | sudo apt install linux-headers-$(uname -r); git pull && make dkms_install |
| Managed-mode only | Kernel stub conflict | Blacklist rtl8811au (see driver page) |
| Injection 0/30 | Empty channel | sudo iw wlan0mon set channel 6 |
| Throughput low | 1×1 AC433 hardware | Not a bug |
| Not detected after reboot | Module not auto-loaded | Add 8811au to /etc/modules-load.d/alfa.conf |
Related resources
- RTL8811AU driver page
- Kali setup guide
- AWUS036ACH — the full-size high-power sibling
- AWUS036ACM — in-kernel alternative
- Adapter comparison