Astrophysics (index)about


(device that reduces the frequency of a signal)

A downconverter is a device often used in the front end instrument of a radio telescope that converts the signal received (from the antenna, often amplified) to a lower frequency, preserving some of the signal characteristics, i.e., relevant information, within a particular band of interest. The frequencies of interest may be very high (in the MHz or GHz range, which are within the frequency range of radio, i.e., radio frequency or RF). A sufficiently lower frequency can more easily be carried by cable and/or can be low enough to be digitized and processed using digital techniques, which offer the flexibility to extract more of the information of interest.

(instrument type,radio,electronics)