Note
The Micoder ll is identical in appearance and specifications to the original Micoder. The big difference is that the Micoder ll is designed with single chip tone encoder technology, which means that no calibration or frequency counter is required.
Note: The side of the microphone opposite the keypad can be fitted with a decorative nameplate or a hanger button. If the hanger button is present, there is no outward way to distinguish the HD-1982 “Micoder” from the HD-1984 “Micoder II.”
Microphone type: electret condenser.
Output level: 30 mV RMS maximum.
Frequency response: 300 to 3000 Hz.
Output load: 10kΩ minimum.
Encoder frequency tolerance: 1.5%.
Distortion: less than 5% (harmonic plus intermodulation)
Operating temperature range: –20 F to +110 F
Battery life: about 6 months.
Power requirements: one 9-volt battery (NEDA 1604), 12 mA.
Photos, general information and specifications from "Heathkit: A Guide to the Amateur Radio Products," by Chuck Penson, WA7ZZE. Used with permission.
