The HYPER ELECTRONIC YUNOST-402B is a 12 inches portable B/w television with 4 programs keyboard preselection with potentiometric tuning search system.
The mechanical turret approach to television tuning has been used almost exclusively for the past 60 years. Even though replete with the inherent disadvantages of mechanical complexity, unreliability and cost, such apparatus has been technically capable of performing its intended function and as a result the consumer has had to bear the burdens associated with the device. However, with the " recent " Broadcast demands for parity of tuning for UHF and VHF channels, the increasing number of UHF and cable TV stations have imposed new tuning performance requirements which severely tax the capability of the mechanical turret tuner. Consequently, attempts are now being made to provide all electronic tuning to meet the new requirements.
One " " new " " tuning system currently being incorporated in some television receivers uses a varactor tuner which overcomes some of the disadvantages of mechanical turret tuner by accomplishing tuning electronically. As the name indicates, the heart of such a tuner is a varactor diode which is used as a capacitive tuning element in the RF and local oscillator sections. In this system, channel selection is made by applying a given reverse bias voltage to the varactor to change its electrical capacitance. The channel selection biasing can be performed by mechanically or electrically switching approximately 5 or many more preset potentiometers. The problem with such arrangement is that it quite seriously limits the number of channels available to the consumer. Additionally, it suffers from the drawback that all potentiometers require adjusting for the desired channels. The VHF channels are usually factory adjusted while the six UHF channels require on-location adjustment. Moreover, using this arrangement, the only indication--during adjustment--of which channel is selected is by station identification.
Thes set is developed and fabricated entirely in U.R.S.S. with complete Russians components at all levels, from semiconductors to all discretes and even the CRT TUBE.
The chassis technology is all discretes based, No ICS. and can be powered with a 12Volt source or Mains 220V.
The Power switch is right side located and unlike many other sets wich have the volume potentiometer toghether with power switch, the HYPER ELECTRONIC YUNOST-402B has the brightness potentiometer integrated with the power switch. When the set is powered off a nice screen fade to black is provided.
All other commands are above located in one rail potentiometers line.
Black and white portable television set equipped with a semiconductor. Screen with a diagonal of 31 cm. A channel selector for I.-V. zone 4 mechanically operated preferences. Plastic housing. Speaker preferences at the right of the screen, the other controls on top of the rear. Possibility of mains or 12V car battery.
Even if it's fabrication year is 1984 the set is still realized in very old fashioned construction technology like one of first semiconductors based portable television sets.
Hyper Electronic , was , is a specialist retailer in consumer electronics.
Basically it's an importer from many lands (Russia) of products then rebranded and marketed.
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