Abstract: A digital target spotting system for scoring projectile shots on a target. The system has a computer with a display, a digital image capturing device (e.g. digital camera or camcorder used with an optical spotting scope) adapted for capturing digital images of a target, an event sensor that detects when a projectile is shot at the target, an anemometer for detecting wind speed and detecting wind direction and a chronograph for detecting the projectile speed of a projectile shot at the target. A communication hub acts as a communication hub between the computer and the input sensor devices. Computer software loaded on the computer processes digital images from the digital image capturing device and extracting hits on the target image to determine where on the target hits are made and scores a shooter's performance.

Abstract: A sine wave modulator for decoding a sine wave encoded television signal includes a passive attenuation network comprising a pi-arrangement of PIN diodes. The encoded signal is supplied to the input port and the decoded signal is taken from the output port. A common bias arrangement for the series-shunt-connected PIN diodes results in the impedance of one PIN diode changing oppositely to the impedance of the other PIN diodes such that the impedance presented to the input and output ports remains substantially constant.