Coax cable loss refers to the reduction in signal strength as it travels through the cable. By measuring this loss, we can determine the efficiency of our antenna systems and make necessary adjustments. Coaxial cable loss is a critical factor to consider in any ham radio setup. Understanding how to measure it ensures optimal signal transmission, reception, and overall performance. With the information shared here, you'll be able to identify and address deteriorating signal quality, troubleshoot connection issues, and finetune your radio system for peak operational efficiency. In this video, we perform a loss test on some coaxial cable with the NanoVNA using what is called an S21 Gain measurement.

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