Note
QST, Nov 1973, p. 172.
Ham Radio, Aug 1975, p. 64.
Kit or assembled.
The 872 Viditype will provide a video display of RTTY signals on any standard television receiver's unused channel. No modifications are required to the TV receiver - simply connect the unit to the antenna terminals.
The model 872 is directly compatible with all common RTTY terminal units and features CR-LF on line feed signal, automatic CR-LF on 40th character or a space in positions 36 to 40, automatic page unshift at the end of the 25th line, manual clear (starts print at upper left screen), selectable down shift on space, manual letters key, and print suppression on all nonprinting functions. Character format is 40 characters per line, 25 lines of display and 1000 character display capacity. The video system uses a crystal-controlled sync generator with a video bandwidth of 3 MHz and 30 Hz refresh rate.
Output is 2000 uV at 50 ohms on TV channels 3 to 6.