SWR Meter - Pencil Box

This SWR Meter is housed in a pencil box. The transmission line is a length of TV hardline. Sensing

Pencil Box
lines are hook-up wires, run close to the centre conductor through longitudinal holes made in the foam dielectric.
Pencil Box Schematic
A tuning indicator (salvaged from an old Philips transistor radio) is used as the indicator, along with a 47KΩ potentiometer for sensitivity adjustment.
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