Measuring output from the FoxTrak, adjusting RV1

Some cool AFSK images:

Measuring output from the FoxTrak, adjusting RV1

Image by Richard Corfield (M0RJC)
Yaesu specify an input of 5mV into a 2K load. Here I have a 2K resistor across the radio connector. When I first set this up I pushed the resistor ends and the probe into the pins of the DB9 socket.

The FoxTrak has been commanded to output a mixed signal using its configuration program.