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Above: Telrad Heater element with power cord and RCA phono style male connector (95,411 bytes).
The Telrad sight is a versatile illuminated finder where the observer looks at a tilted glass window onto which is projected a red LED illuminated reticle pattern; this pattern appears suspended over the target area in space. Seeing through the sight and into the distance depends on being able to have the Telrad window remain free of dew or frost. Invariably, telescopes are used at night and often in areas where dew can form. Dew is moisture naturally found in the air that condenses onto surfaces when their temperature cools down to the 'dew point', at this temperature materials including the glass window of the sight become a condenser so a fog will form across the window and it becomes opaque. To prevent this occurrence Company Seven offers two optional solutions:
2. Telrad Window Heater Element - an active, powered resistive heater element that works with an optional heater controller
The Telrad Window Heater Element is powered by 12 volts dc with the current regulated by an optional heater controller. The power cord is provided with an RCA phono style male connector so that it can plug into one of the sockets of controllers offered by Company Seven. The controller in turn plugs into a 12 volt DC power source, this can be a battery or an AC to DC Power Supply.
Right: Heater element installed in the Telrad window, it reduces the field somewhat but all Telrad reticle circles remain visible.
The Window Heater Element accessory for the Telrad sight is installed by the user, and no tools are needed. Simply slide the heater element onto the window of the sight, into the void between the Telrad lens and display window as shown at right.
A side benefit of the heater is that in freezing conditions, this can prevent frost (from operators breath for example) from forming on the window.
Operation of the Telrad Window Heater Element:
TELRAD WINDOW HEATER SPECIFICATIONS
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