Bird 25D RF Coaxial Load Resistor

The Bird 25D is a 25-watt RF coaxial attenuator designed for power reduction in RF circuits and test setups. It is engineered to minimize signal distortion and reflections, ensuring measurement integrity and component protection. This attenuator is part of Bird Technologies’ line of robust, self-cooled RF power attenuation solutions, suitable for various professional RF applications.

### Technical Specifications

* **Power Rating:** 25 Watts (average)
* **Frequency Range:** 200-500 MHz (Some sources indicate broader ranges for other 25W series attenuators, such as DC-4 GHz, DC-6 GHz, and DC-18 GHz, but the 25D specifically is listed within the 200-500 MHz band in multiple sources.)
* **Attenuation Values:** The Bird 25D is a plug-in element for Bird wattmeters and typically operates within a specific frequency band at its rated power. While the prompt specifies 3, 6, 10, and 20 dB as potential values, the primary designation “25D” in datasheets and product listings often refers to the power rating and frequency band rather than a specific dB value. However, Bird offers a wide range of attenuator elements, including those with various dB values and power ratings up to 25 watts across different series (e.g., 25-A Series, 25-6A Series, 25-18A Series). For instance, a “25D Bird Wattmeter Element” is described for the 200-500 MHz range at 25 Watts. Other 25W attenuators are listed with specific dB values, such as 30 dB.
* **Connector Type:** Type N connectors (Specifically, N male to N female is a common configuration for attenuators.)
* **Impedance:** 50 Ohms (standard for Bird wattmeter elements and attenuators)
* **VSWR:** While specific VSWR figures for the 25D are not consistently detailed across all search results, Bird wattmeter elements are designed for low insertion VSWR, typically less than 1.05:1 up to 1000 MHz. Other 25W series attenuators often specify a VSWR of 1.10:1 or 1.25:1 across their operational bands.
* **Accuracy:** Plug-in elements are calibrated according to meticulous Bird calibration procedures to assure adherence to advertised specifications.
* **Cooling:** Convection-cooled, passive self-cooling, requires no external power or active cooling.
* **Shielding:** Fully shielded to prevent unwanted radiation and minimize stray interference.
* **Construction:** Robust construction for durability.
* **Application:** Designed for use in test environments, system protection, signal isolation, and reducing power levels in RF circuits.

### Electrical Specifications

* **Insertion Loss:** Typically negligible in addition to the specified attenuation value, designed to minimize signal degradation beyond the intended attenuation.

### Interfaces

* **Connectors:** Type N connectors are standard. Specific configurations may vary (e.g., N Male to N Female).

### Physical Specifications

* **Form Factor:** Plug-in element for Bird Wattmeters (e.g., Bird 43 Wattmeter).
* **Size:** 7/8 Inch is mentioned in the context of plug-in elements.

### Compatibility

* **Wattmeter Integration:** Designed as a plug-in element for Bird Thruline Wattmeters, such as the Model 43.
* **System Integration:** Suitable for use in various RF test setups and systems requiring controlled power reduction.

### Why Choose Aumictech for Bird 25D?
At Aumictech, we specialize in supplying high-end RF coaxial attenuators and related equipment. Whether you need reliable power reduction for critical RF circuits, precise attenuation for test and measurement setups, or robust components for system protection, our team ensures the Bird 25D delivers maximum performance and measurement integrity for your application.