Note
The HD-3030 was designed to bring radioteletype into the computer age. The HD-3030 can be used in conjunction with Heath’s H-89 computer and other DOS-based computers (with the appropriate software), or with traditional mechanical teletype units.
The HD-3030 can send and receive ASCII and Baudot RTTY, as well as CW, and is designed with eight plug-in circuit boards and a mother board. Features include 6-pole active pre-select filtering, data rates up to 300 baud (RTTY), TTL and RS-232C I/O, and a built-in 20/60 mA loop supply for old-style terminals.
The unit also features a crystal controlled AFSK generator, capability for full FSK with equipped transmitters, and true mark/space detection. An autostart function energizes an AC receptacle on rear panel. The front panel has LEDs for power, send, RDA, mark, and space, and a 10-segment bargraph tuning indicator.
Front panel controls include flag-type pushbuttons for power, operate/standby, send/receive, CW/RTTY, send/receive (reverse shift), preselect/bypass, and 170, 425, and 850 hertz (independent and interlockable shifts). A preselect filter for 170 hertz is optional, and an optional 425/850 Hz filter/shift board provides a 425 or 850 shift, but not both. This option is chosen during assembly.
Rear panel connections include a loop jack input (100 VDC @ 20 or 60 ma), 25-pin DB-25 I/O connector for TTL and RS-232C computers, terminals and printers, a 120 VAC 340 watt autostart receptacle, and ground post. There is also an output for scope tuning. Caution: the Autostart receptacle is not fused.
Note: You will absolutely need the manual to make sense of the HD-3030. Calibration requires an AC voltmeter or oscilloscope.
References:
Review. CQ. Nov 1984, p. 60.
Review. QST. Feb 1985, p. 38.
INPUTS
KEY-N: TTL compatible, active only in Send only. Requires pull-down to
enable AFSK downshift for CW ID.
AFSKIN-TTL: TTL compatible, Mark high. Requires pull-down for Space.
AFSKIN-RS: RS-232C compatible bipolar input. Mark = –3 volts minimum, Space = +3 volts minimum.
SEND-N: TTL compatible. Requires active pull-down to place interface in Send mode.
SEND-P: RS-232C compatible bipolar input. Requires active pull-up to place interface in Send mode. Transmit = –3 volts minimum, Receive = +3 volts minimum.
RECAUDIO: (Receiver audio input) Connects to any source between 4Ω and 16Ω impedance. 100 mV minimum level.
OUTPUTS
DMOUNT-TTL: TTL compatible demodulator keying output. Mark high.
DMOUNT-RS: RS-232C compatible bipolar output. Mark = –6 volts minimum, Space = +6 volts minimum into a 3000Ω load.
XMIT-P: Positive keying for PTT or CW. 50 mA maximum. Toggled by Send-N and Send-P inputs.
XMIT-N: Negative keying for PTT or CW. 50 mA maximum. Toggled by Send-N and Send-P inputs.
SCOPE MARK: 50kΩ impedance. Mark filter output, phase corrected for accurate “+” display on oscilloscope.
SCOPE SPACE: 50kΩ impedance. Space filter output, phase corrected for accurate “+” display on oscilloscope.
SENDAUDIO: AFSK audio output. Adjustable 0 to 2 volts RMS, 600Ω impedance.
FSK: Frequency shift keying bipolar output. Mark = –6 volts minimum, Space = +6 volts minimum into a 3000Ω load.
RDA OUTPUT: TTL compatible active pull-down output. Indicates presence of received signal in Receive mode. Locked off during Send.
LOOP OUTPUT: 100 volts, 60 mA or 20 mA current loop. Internal jumper required for 60 mA.
AUX OUTPUT: 5 amp relay contact supplies 120 VAC when triggered by Autostart.
CW DEMODULATOR
Center frequency: 750 Hz
–3 db bandwidth: 70 Hz
–20 db bandwidth: 250 Hz
170 HZ PRESELECTOR (optional)
–3 db bandwidth: 350 Hz
–20 db bandwidth: 665 Hz
GENERAL
Power requirements: 120 VAC, 60 Hz
Photos, general information and specifications from "Heathkit: A Guide to the Amateur Radio Products," by Chuck Penson, WA7ZZE. Used with permission.
