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The Icom IC-7300 transceiver's stock cooling fan, a 12VDC unit typically run at 6VDC with a 10VDC transmit kick, is often perceived as noisy. This modification replaces the original fan with a **Noctua NF-A8 PWM** fan, which is described as "silent" even during the initial 10V transmit kick. The resource provides specific wiring details, noting black for negative and yellow for positive connections, and suggests using readily available 2-pin fan plugs for a clean installation. This fan replacement significantly reduces operational noise, improving the user experience of the IC-7300. The Noctua NF-A8 PWM fan is available for under £20 in the UK, making it an accessible upgrade. The modification is presented as a straightforward process, enhancing the rig's acoustic profile without compromising cooling efficiency, based on the experience of Bjorn Eklund, **SM7IUN**.

Callook provides a **USA amateur radio callsign lookup service** with data current as of March 25, 2026. The platform allows users to search for valid callsigns and retrieve detailed information, including geographic coordinates sourced from the Bing Maps API. A mathematically calculated **grid square** is derived from these coordinates, though accuracy is not guaranteed due to reliance on external services. The service supports multiple access methods, including a browser search plugin, direct API access with a reference, and plain text output for integration into other applications or scripts. This tool facilitates rapid identification of US amateur radio operators, offering an alternative to other callbook services. Its API access enables developers to integrate callsign lookup functionality into custom applications, streamlining data retrieval for logging software or contest management. The direct presentation of FCC data, combined with grid square calculation, assists DXers and contesters in verifying contact information and location details during on-air operations.