Note
HD-1418 1983-1985 $49.95
HD-1418A 1985-1991 $49.95
The HD-1418 features 12 total poles of filtering that can be combined in various ways to make better copy out of closely packed AM, SSB, or CW signals. The unit features separate high and low pass filters that are a 5-pole tunable elliptical type with a 300-2500 Hz range at –6 db.
The notch/peak filter is a 2-pole tunable type creating a notch as narrow as 200 hertz and as deep as 30 dB. Input impedance is Hi-Z, 5000Ω minimum. Input/output connections are RCA jacks. A convenient tape output is at –20 dB.
Note that the headphone jack is a mono connector and that you’ll have to use an adapter if you use stereo phones. When the HD-1418 is switched off, signals are bypassed around it.
The HD-1418 uses 22 common ICs. The unit is designed for standard power cube operation. The original is brown while the "A" version is gray.
References:
Review. QST. Mar 1984, p. 42.
High pass filter: 5 pole tunable, 300 Hz to 2500 Hz @ –6 db
Low pass filter: 5 pole tunable, 300 Hz to 2500 Hz @ –6 db
Notch/peak filter: 2 pole tunable
range: 300 Hz to 3000 Hz
width: 200 Hz @ 6 db
depth: 30 db
Input impedance: 5000Ω minimum
Nominal gain: unity
Audio amplifier power: 1 watt into 4Ω
Power requirements: 7 to 13.5 VAC, or 9 to 18 VDC, 400 mA
Photos, general information and specifications from "Heathkit: A Guide to the Amateur Radio Products," by Chuck Penson, WA7ZZE. Used with permission.
