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Picture : R.L. DRAKE COMPANY
Microprocessor-Controlled Communications Terminal
Receive only
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 | This compact receive-only communications terminal is
designed to demodulate and display the three most popular over-the-air modes of data
communications: CW (Morse code), RTTY (Baudot), and ASCII. |
| Any standard TV monitor can be used. |
| A full-featured microprocessor controlled unit, the Drake
‘Theta 550 has selective calling, battery backed-up memory, audio monitor, and
informative L.E.D. tuning indicators . There is also interfacing to permit the addition
of a dot matrix printer for "hard" copy and a keyer paddle input to permit CW
transmission with full iambic operation. |
| This unit is ideal for shortwave listeners and hams who have
been missing the increasing volume of data communications over the air. |
PRELIMINARY SPECIFICATIONS
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MODES: CW - automatic tracking of speed range 5 to 50 words/minute RTTY and ASCII - 9
selectable speeds of 45.45, 50, 56.88, 74.2, 100, 110,. 150, 200, and 300 baud.
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DISPLAY: 40 characters/line x 16 lines/page x 2 pages
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INPUTS : Audio or TTL logic inputs
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AFSK TONE SETS: CW - 790 Hz or 395 Hz
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RTTY and ASCII - Marking tone of 1275 Hz or 2125
Hz, Space tone at
170 Hz, 425 Hz, or 850 Hz
shift
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MEMORY: 4 memories of 47 characters each
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OUTPUTS: 75 ohm video, parallel ASCII printer port,
opto-isolator keyer output
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POWER: requires 12 to 13.8 VDC at 800ma.
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