Note
QST, Oct 1955, p. 156.
QST, Oct 1964, p. 190.
QST, Mar 1968, p. 168.
90672 operating manual.
Antenna bridge for measuring impedance in the range of 5 to 500Ω for unbalanced input, and 20 to 2000Ω for balanced input (using a 4:1 balun) at radio frequencies up to 200 MHz. The meter is 50 µA movement. The 90672 was designed to use a grid dip meter as a signal source.
It is an entirely passive device, and requires no battery or external power.
