Heathkit HD-1420 VLF Converter

Input frequencies: 10 to 500 kHz

Output Frequencies; 3.510 TO 4.000 MHz

Sensitivity: 1 to 1.5 uv typical

Power: 6 to 14 vdc, type 1604 9 volt battery or
       external power supply at 20ma typical

Dimensions: 5 1/8" x 5 1/8" x 2 1/4"

Weight: 1 lb