The Daiwa CS-201A is a commercial-grade, high-isolation 2-way coaxial antenna switch engineered to manage RF distribution lines within professional base stations, emergency dispatch centers, and high-power radio communications. Housed in a heavy-duty, die-cast metal chassis, this premium selector switch allows operators to toggle a single transceiver between two separate antenna systems, or route a single antenna array between two independent radio units. Built to strict industrial tolerances, the CS-201A provides reliable, low-loss performance across a wide frequency spectrum stretching up to 600 MHz.
The defining engineering asset of the Daiwa CS-201A is its specialized internal cavity construction, protected under Patent 1565157. This advanced design ensures that all **unused ports and circuits are automatically grounded** when not actively selected. This critical safety and technical functionality isolates unselected transceivers from stray RF energy bleed, dramatically reduces crosstalk interference, and helps protect offline equipment from atmospheric static discharge or nearby lightning induced currents. The heavy metallic enclosure acts as a continuous RF shield, delivering an outstanding isolation metric of 60 dB across its entire operational spectrum.
Capable of handling rigorous power configurations, the CS-201A supports up to **1.5 kW PEP (continuous wave)** from DC to 30 MHz, stepping to 1 kW from 30 to 150 MHz, and maintaining a robust 500W threshold up to 600 MHz. It features an exceptionally low insertion loss of just 0.12 dB and keeps the Voltage Standing Wave Ratio (VSWR) to a strict 1.2 or less at maximum frequency, preventing hazardous impedance mismatches. Outfitted with three precision-machined PL Type (SO-239) connectors matching standard 50-Ohm transmission lines, this 0.43 kg mechanical switch delivers a rugged, tactile plug-and-play solution built for absolute long-term reliability.
Key Features
- Patented Cavity Architecture (PAT. 1565157): Premium internal cavity configuration guarantees optimal shielding, minimizing internal signal leakage and impedance variations.
- Automatic Port Grounding: Intuitively grounds all unused terminal ports automatically to block stray RF bleed and protect inactive radio assets.
- High 1.5 kW Power Threshold: Safely processes heavy operational power outputs up to 1.5 kW CW on HF bands, supporting high-power commercial amplifiers.
- Outstanding 60 dB Isolation: Delivers deep 60 dB crosstalk attenuation to preserve maximum signal cleanliness between lines.
- Ultra-Low Insertion Loss: Maintains a tight 0.12 dB maximum transmission loss from DC up to 1,000 MHz, preserving fragile receive paths.
- Rugged Die-Cast Enclosure: Heavy-duty metallic casing weighs 0.43 kg, absorbing field impacts while providing continuous structural RF grounding.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Daiwa |
| Model Designation | CS-201A |
| Product Type | 2-Position RF Coaxial Selector Switch |
| Frequency Range Limit | DC up to 600 MHz (Insertion loss rated to 1,000 MHz) |
| RF Power Ratings (CW) | DC – 30 MHz: 1.5 kW 30 – 150 MHz: 1.0 kW 150 – 600 MHz: 500 W |
| Insertion Signal Loss | 0.12 dB (From DC to 1,000 MHz) |
| Cross-Port Isolation | 60 dB (From DC to 600 MHz) |
| Voltage Standing Wave Ratio (V.SWR) | ≤ 1.2 (Measured up to 600 MHz) |
| Nominal System Impedance | 50 Ohms |
| Coaxial Port Interface | 3x PL-Type (SO-239 / UHF Female Sockets) |
| Output Distribution Channels | 2 Ports |
| Chassis Structure Material | Heavy-Duty Protected Die-Cast Metal |
| Net Equipment Weight | 0.43 kg |
Package Content
- 1x Daiwa CS-201A 2-Way Coaxial Antenna Switch Unit
