Compact digital TV tuner unit

A compact digital Television (TV) tuner unit mounted on an analog receiver equipped with an analog tuner, comprising:

• a rectangular boxy chassis;
• a terminal face of the chassis facing the analog receiver;
• an antenna input terminal that is placed on the terminal face, and is connected to an external antenna wire;
• an antenna output terminal that is placed on the terminal face in parallel with the antenna input terminal, and is connected to the analog receiver;
• a digital tuner module that is placed in the chassis and that receives digital broadcast signals input through the antenna input terminal to generate digital signals;
• a decoder module that is placed in the chassis and that decodes the digital signals to convert the demodulated digital signals to analog signals;
• and
• an RF module that is placed in the chassis and that modulates the analog signals to generate analog broadcast signals that are output to the antenna output terminal,
• the digital tuner module, the decoder module, and the RF module are placed on a loop line starting at the antenna input terminal and ending at the antenna output terminal in the chassis;
• a power supply circuit of the compact digital TV tuner unit, a RAM and a ROM used by the decoder module are placed outside the loop line;
• and
• the axial directions of both antenna input terminal and antenna output terminal are perpendicular to the terminal face and the loop line that are placed in parallel.