Coax & Heliax Vp

Nominal velocity factor by cable type. Tap a cable to use it in the length calculator at the bottom.

	Dielectric

Cut length for a given frequency

Cable

Vp (editable)

Frequency, MHz

Quarter wave

Half wave

Full wave

Example inputs shown. Lengths are electrical length in the cable, measured from connector reference plane to reference plane. Ranges use the midpoint. Foam Heliax shifts by size and series, so confirm on the CommScope datasheet and with a VNA or analyzer for phasing lines, stubs and filters.