ID: 
1886
Maker's Name: 
Radiophysics Laboratory
Where made: 
Australia
Dimensions: 
25.7 × 24.5 × 11.5 cm

The unit consists of quarter-wave cavity whose length can be varied by a plunger attached to a micrometer thimble. A crystal diode and 100uA meter at the electrical node indicate a maximum when the cavity is set to the right length. The frequency range is 1.76 to 4.93 GHz. The unit is calibrated indirectly with a sub-standard signal generator.