Note
QST, Oct 1955, p. 156.
Allied Radio catalog 1958 (copyright 1957), p. 277.
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.
