The **AK-AV504-R** is a specific electronic component primarily identified as a **High-Definition (HD) Video Balun** or a **Passive Video Transceiver**. It is designed to transmit high-resolution video signals over twisted-pair cables (like Cat5e or Cat6) instead of traditional coaxial cables. --- ### Technical Specifications | Feature | Specification | | :--- | :--- | | **Transmission Signal** | 1 Channel | | **Compatible Formats** | AHD / HD-CVI / HD-TVI / CVBS | | **Resolution Support** | 720P / 960P / 1080P / 3MP / 4MP / 5MP / 8MP (4K) | | **Transmission Distance** | 200m to 400m (depending on resolution and format) | | **Connector Type** | BNC-M (Male) to Push-terminal / Screw-terminal | | **Category Type** | UTP CAT5/5E/6 | | **Power Requirement** | Passive (No external power required) | --- ### Key Electronic Components & Design #### 1. The Balun Transformer The "heart" of the device is the **Balun** (Balanced-Unbalanced) transformer. * **Function:** It converts the unbalanced signal (coaxial) into a balanced signal (differential signaling) for UTP cables. * **Impedance Matching:** It matches the **75-ohm** impedance of the BNC connector/coaxial cable to the **100-ohm** impedance of the twisted-pair cable. This prevents signal reflection and ghosting. #### 2. Protection Circuitry The AK-AV504-R typically includes built-in protection to ensure longevity and signal integrity: * **TVS (Transient Voltage Suppressors):** Protects the connected DVR and Camera from voltage spikes and surges. * **ESD Protection:** Built-in Electrostatic Discharge protection (usually up to 2KV). * **Wave Filter Design:** An anti-static and anti-interference design that filters out electromagnetic interference (EMI) from nearby power lines. #### 3. Connectors * **BNC Male:** Made of high-quality zinc alloy or pure copper with gold-plated pins to ensure low contact resistance. * **Terminal Block:** Often features a "Press-fit" or "Push-button" terminal which eliminates the need for a screwdriver, ensuring a tight physical connection to the copper strands of the Cat5/6 cable. --- ### Performance Overview | Signal Type | Max Distance (approx.) | | :--- | :--- | | **HDCVI (720P)** | 400 Meters | | **TVI (1080P)** | 250 Meters | | **AHD (5MP)** | 200 Meters | | **Analog (CVBS)** | 500 Meters | --- ### Application Usage The AK-AV504-R is used in CCTV surveillance systems to: 1. **Reduce Costs:** UTP cable is generally cheaper and easier to pull than thick RG59 coaxial cable. 2. **Simplify Wiring:** One Cat5e cable can carry 4 separate video signals (using all 4 pairs), whereas coax requires 4 separate bulky cables. 3. **Improve Signal Reach:** In many cases, differential signaling over UTP provides better noise immunity over long distances than coaxial.