RECEIVER SELECTIVITY

Transmitters and Receivers Glossary

Transmitters and Receivers — Receiver Selectivity

Information on Receiver Selectivity

The selectivity of the receiver is its ability to receive the wanted signal and reject unwanted signals in adjacent channels. Receiver selectivity is normally quoted by means of a graph showing the output of the receiver in dB relative to the maximum output, plotted against the number of kHz off-tune, or by quoting some points on this graph. For example, the selectivity of a HF receiver may be quoted as -6 dB at 3-kHz bandwidth and -60 dB at 12-kHz bandwidth. Typically, an AM receiver has a 3 dB bandwidth of about 9 kHz, an SSB receiver approximately 3 kHz, and an FM receiver's bandwidth is about 200 kHz. The adjacent channel selectivity of a radio receiver is the responsibility of the IF amplifier.

If you would like to propose related entries to be added to the glossary, please contact us. © Argos Press Pty Ltd, Canberra, 2003-2009. All rights reserved. Please contact Argos Press Pty Ltd to request permission to reproduce, broadcast, adapt and communicate content from this web site (such as this entry on Receiver Selectivity).