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The CD100 Multicounter combines an accurate RF frequency counter, and an off-the-air decoder in one
hand held unit. Used as a test instrument for checking two-way radios, the CD100 demodulates an FM
carrier and decodes CTCSS, DCS, LTR, and DTMF. The two line by 16 character LCD display will
display the frequency on the top line and the selected decode mode on the bottom line.
The CD100 has a fixed 100 Hz resolution. It also incorporates digital filtering to ensure that frequen-
cies displayed are real transmitted signals and not noise. A frequency measurement and an associated
decode value can be stored in one of 100 non-volatile memories. The measurement data can be down-
loaded to a PC or recalled to the display.
The CI-5 serial data port can be used to communicate with a PC or to tune a radio receiver to the fre-
quency displayed. The ability to tune a radio from the digitally filtered frequency measurement is
known as “Reaction Tuning” which is a patented technique developed by Optoelectronics Inc.
Introduction
