For sale Working AN/URM – 25J RF Signal Generator in excellent condition. Very hard to find one of these that hasn’t been bashed around and complete with all it’s optional extras, including copy of manual enclosed. These were commonly used by the U.S. Navy, and as such run on 110v so a step down transformer has to be used. Frequency output ranges from 10 kHz to 50 MHz with amplitude modulation selectable at 400 and 1,000 Hz. RF level from 0.1 microvolts to 100 millivolts or 2 volts is available depending upon termination load. Output impedance is 50,500 ohms. As with all vintage electronic equipment no warranties given or implied.