Note
QST, Nov 1981, p. 205.
QST, Apr 1982, p.127.
Models 401 and 405 use the Curtis 8044 IC, and have an easier to use design and layout than the old Econo Keyer line.
All controls are located on the front panel where they are easy to find and use.
There are front-panel controls for both speed and volume. The on/off switch and auto/semi-auto switch are also on the front. This switch lets you use the Econo Keyer Il like a bug or it can be used to make tuning more convenient. A red LED indicates when the MFJ-401/405 Econo Keyer Il is on.
The units may be used with an internal 9-volt battery or any source of 5-9 V dc.
Circuitry is provided for both grid block and direct keying. This lets the keyer work well with tube-type and solid-state rigs.
The MFJ-405 Econo Keyer II has a built-in clear lucite paddle and a jack on the back for an external iambic paddle. The MFJ-401 does not have a built-in paddle, but all other features are the same.
