What difference does a V make?

NOAA weather satellites Automatic Picture Transmission
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srcejon
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What difference does a V make?

Post by srcejon »

In Adam-9A4QV's weather sat antenna v-dipole tutorial, he suggests bending the dipole to 120°. The question is often asked, what difference does the bend make? Here's a few plots from Matlab's antenna designer:

V0deg.png
V0deg.png (148.37 KiB) Viewed 982 times
V30deg.png
V30deg.png (151.85 KiB) Viewed 982 times

The bend helps match the antenna to a 50ohms receiver, resulting in more signal power being delivered to the SDR.

(I used a slightly shorter element length, as calculated by SDRangel's Antenna tools, to account for the end effect.)
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