Note
Ham Radio, Nov 1971, p. 118.
Ham Radio, Oct 1972, p. 87. ("B" version)
QST, Feb 1973, p. 120.
Ham Radio, Apr 1974, p. 40.
The Memory-Matic 500 keyer was designed to send all code elements: dot, dash, dot space, dash space, character space and word space in an instant-start, self-completing mode with no missed or extra dots or dashes and provides jam proof dot, dash, character and word spacing. Each code element is automatically generated with little or no effort on the part of the operator.
The memory system included with each Memory-Matic 500 provides operator with provision for instant storage of code characters or messages, for an immediate reply to on-the-air contacts.
Messages of approximately 40 code characters are easily keyed into the
memory for calling stations, giving a contest exchange, calling CQ or testing. Loading code characters into memory or transmitting messages from memory is accomplished at the same speed and weighting ratio in use by the operator. The memory allows continuous transmission on a repetitious basis of any message in storage.
Iambic squeeze keying is provided through the use of twin paddles. Iambic operation provides alternate dots and dashes when both paddles are squeezed.
Advanced dot-dash memories automatically insert a dot in a series of dashes or a dash in a series of dots and insures against missed or extra dots or dashes. Jam-proof spacing is provided for dots, dashes, characters and words. Dot and dash spacing i s automatically added fol- lowing each dot or dash. Character spacing is automatically added following the last dot-dash element which make up each character. Word spacing is automatically added following the last character which makes up each word.
A 500-bit instant-load memory is provided in the Memory-Matic 500 which can be programmed or updated by moving the function switch to rnemory- load and keying any message into memory. When 50 storage positions re- main in memory the monitor's sidetone pitch automatically increases, indicating to the operator that the memory is near-full. The monitor will emit a steady sidetone if the memory overflows; this condition necessitates reprogramming of the memory-load sequence. Once a message is entered into memory it can be transmitted manually or automatically at intervals ranging from a fraction of a second to several minutes.
Adjustment of the automatic transmission interval is accomplished by a rear panel control.
Speed range is 5 to 85 words per minute with adjustable weighting, independent of speed. They have provision for keying with a regular straight key and keyer activation by either a single or dual paddle key.
Tune switch, variable pitch sidetone oscillator, 117-Vac power supply, and off-the-air self-testing circuitry are built into the keyer.
The "B" version, released late in 1972, has an option to expand to 800 bits of memory.
References
Brief description (500B). Ham Radio, Apr 1974, p. 74.
