Overview
The Yaesu XF-115C is an optional narrowband CW filter designed for use in select Yaesu HF and HF/VHF/UHF transceivers. It improves receiver selectivity by reducing the IF bandwidth, allowing better isolation of weak signals in crowded band conditions. This filter is intended primarily for continuous wave (CW) operation.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | XF-115C |
| Type | Mechanical filter |
| Manufacturer | Collins |
| Collins Part Number | 526-8686-030 |
| Center Frequency | 455 kHz |
| Bandwidth | 500 Hz |
| Application | CW (Morse code) operation |
| Installation | Internal plug-in module |
| Compatible Radios | Yaesu models supporting 455 kHz optional filters (e.g., FT-817, FT-857, FT-897, FT-847; compatibility depends on filter slot configuration) |
Physical Description
The XF-115C is a compact plug-in module housed in a rectangular metal shield can mounted on a small circuit board. It incorporates a Collins mechanical filter element (P/N 526-8686-030), known for its narrow bandwidth and sharp selectivity characteristics. The module uses pin connectors for installation into compatible Yaesu transceivers, and the shielded enclosure helps maintain signal integrity within the receiver’s IF stage.
History
Yaesu offered a range of optional IF filters to enhance receiver performance across many of its transceivers from the 1990s through the 2000s. The XF-115C was part of this lineup, utilizing a Collins-manufactured mechanical filter to provide a 500 Hz bandwidth option for CW and weak-signal work. These filters allowed operators to tailor receiver performance for demanding conditions such as contesting and DX operation.