Hi All,

Found this forum and note when looking for some help on my MFJ-259B.

My MFJ 259B has developed a fault where the Impedeance meter Z reads 0 at all times and doesn't deflect at all. The SWR meter does read and dips when I tune through the resonant frequency of my aerial.

Using the instructions in this note for testing I get R240 S139 Z000 with Open circuit and R202 S039 Z000 with Short Circuit.

My thoughts are the Z000 matches the zero on the meter and so problem is probably the bridge and not the wiring or the meter itself?

Dismantle and check diodes?

Any help appreciated.

Paul

An