Note
The HD-3006 was on the market for just over two years. The idea was to replace the oscilloscope—the traditional means of tuning in a RTTY signal—with a tiny, low cost, solid-state device. The HD-3006 uses 16 LEDs to indicate correct tuning. Eight vertical LEDs indicate mark strength, and 8 horizontal indicate space strength. Just tune the receiver for maximum vertical and horizontal display. The unit has a wide voltage range and is compatible with almost any interface or terminal unit with a scope output for tuning.
Input level threshold: 0.3 volts RMS AC or 0.5 volts DC.
Maximum input: 15 volts RMS AC or 15 volts DC.
Each axis: requires about 14 dB no-signal-to-signal voltage ratio (5:1) for full width display.
Power requirements: 8-16 volts AC/DC, 150 mA typical
Photos, general information and specifications from "Heathkit: A Guide to the Amateur Radio Products," by Chuck Penson, WA7ZZE. Used with permission.
