The **CCT-38SX30-RMS** is a high-performance electromechanical coaxial switch manufactured by Teledyne Coax Switches. It belongs to the **CCT-38S** series, which are typically SPDT (Single Pole Double Throw) switches designed for high-frequency microwave applications. --- ### 1. General Specifications This component is used to route RF signals between a common port and two output ports with high precision and low signal loss. | Feature | Specification | | :--- | :--- | | **Switch Type** | SPDT (Single Pole Double Throw) | | **Frequency Range** | DC to 18 GHz (Typical for 38S series) | | **Actuator Type** | Latching | | **Connector Type** | SMA (Female) | | **Operating Voltage** | 28 Vdc (Indicated by the '30' code) | | **Termination** | Non-Terminated | --- ### 2. Breakdown of the Model Number The alphanumeric code identifies specific electronic and physical characteristics: * **CCT**: Refers to the series family (Commercial Coaxial Switch). * **38S**: Standard SPDT configuration with specific frame size/frequency rating. * **X**: Placeholder for specific mounting or accessory options. * **30**: Indicates the **Actuator Voltage** (Nominally 28-30 Vdc). * **RMS**: Represents the specific electronic circuit features: * **R**: Positive Common (Standard for many latching types). * **M**: Indicator Contacts (Allows a remote system to verify the switch position). * **S**: TTL Logic Driver (Allows the switch to be controlled via low-power digital signals). --- ### 3. Key Electronic Subsystems #### A. The Latching Actuator Unlike a "failsafe" switch which requires constant power to stay in a position, this **Latching** switch uses a pulse of current to flip the contact. It remains in that position even after power is removed, making it highly energy-efficient for aerospace or remote installations. #### B. TTL Logic Driver ('S' Suffix) The "S" indicates an integrated **TTL Driver**. This is a critical electronic part that acts as an interface between a microprocessor (5V logic) and the high-power actuator coils (28V). You do not need a separate relay or transistor circuit to trigger the switch. #### C. Indicator Contacts ('M' Suffix) The internal electronic assembly includes a secondary set of contacts mechanically linked to the RF path. These allow the user to: 1. Light up an LED on a control panel. 2. Send a "Status OK" signal to a computer controller. --- ### 4. RF Performance Metrics Electronic performance is measured by how "invisible" the switch is to the signal: * **Insertion Loss:** Very low (usually <0.5 dB), meaning minimal signal strength is lost. * **Isolation:** High (>60 dB), ensuring no signal leaks into the "Off" port. * **VSWR:** Typically <1.5:1, ensuring minimal signal reflection back to the source.