On 8/17/2025 2:30 PM, David Gilbert wrote:
Even if you have "equal" length feedlines they don't necessarily have
exactly the same velocity factor.
Of course, and with instrumentation capable of TDR, we can measure and
trim their electrical lengths to match. I'm using the excellent DG8SAQ
VNWA, built and sold by a ham in the UK. It implements TDR by performing
an inverse FFT on wide frequency sweep. We can select from a half-dozen
windowing functions for the best view of the data.
73, Jim K9YC
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