The **1261-R** typically refers to a high-performance **Intermediate Frequency (IF) Bandpass Filter**, often manufactured by companies like *CTS Electronic Components* or *Tusonix*. These components are critical in RF (Radio Frequency) communication systems. --- ### 1. Key Technical Specifications The "1261-R" series is designed to isolate specific frequencies while suppressing noise. Below are the generalized specifications for this class of component: | Parameter | Typical Value / Description | | :--- | :--- | | **Component Type** | Helical or Dielectric Bandpass Filter | | **Center Frequency** | Varies by model (often in the 400MHz - 2.5GHz range) | | **Impedance** | 50 Ohms (Standard) | | **Mounting Type** | Through-hole or Surface Mount (SMD) | | **Operating Temperature** | -40°C to +85°C | | **RoHS Status** | Compliant (indicated by the 'R' suffix in many series) | --- ### 2. Functional Role in Electronics The 1261-R serves several vital roles within a circuit board: 1. **Signal Selection:** It allows a narrow band of desired radio frequencies to pass through to the receiver while blocking "image" frequencies and interference. 2. **Harmonic Suppression:** In transmitter stages, it ensures that only the intended frequency is broadcast, preventing interference with other devices. 3. **Impedance Matching:** It often helps match the impedance between different stages of an RF amplifier chain to maximize power transfer. --- ### 3. Common Applications These parts are found in industries requiring high reliability and precise frequency control: * **Wireless Infrastructure:** Base stations and repeaters for cellular networks. * **Satellite Communications:** Down-converters and signal processing units. * **Military/Aerospace:** Secure radio communication sets and radar sub-assemblies. * **Test Equipment:** Spectrum analyzers and signal generators. --- ### 4. Identification Tips If you are looking at a physical part labeled "1261-R": * **Manufacturer Logo:** Look for a stylized "CTS" or a small "T" (Tusonix). * **Date Code:** There is often a 4-digit code (YYWW) indicating the year and week of manufacture. * **Housing:** Usually encased in a metal shield to prevent Electromagnetic Interference (EMI).