crisp@uncecs.edu (Russ Crisp) (11/30/90)
Hello netlanders. Is there anyone out there who can help me understand how a FM broadcast translator works? Specifically, I need to know how the signal from the station being rebroadcast is extracted from the receiver side of the translator, what form it is in upon extraction, and how it is applied to the transmitter side. It would seem illogical to decode the stereo subcarrier, deemphasis it, only to turn around and encode the stereo signals, and add preemphasis again. Anybody got an idea here, or a good book to refer to on this subject? Regards, Russ Crisp Systems Analyst - Western Carolina University INTERNET: crisp@wcuvax3.wcu.edu
bill@videovax.tv.tek.com (William K. McFadden) (12/01/90)
In article <1990Nov29.180715.18701@uncecs.edu> crisp@uncecs.edu (Russ Crisp) writes: >Is there anyone out there who can help me understand how >a FM broadcast translator works? Translators are fairly simple. The kind used for FM broadcasting have an RF amplifier followed by a local oscillator and mixer to provide 10.7 MHz. This is passed through an IF filter to improve selectivity. So far, nothing is different than an ordinary FM tuner. Next, another local oscillator and mixer are used to beat the 10.7 MHz IF to the desired output frequency. This is then filtered and amplified and sent to the transmitting antenna. At no point is the signal demodulated, so all the subcarriers will be intact. -- Bill McFadden Tektronix, Inc. P.O. Box 500 MS 58-639 Beaverton, OR 97077 bill@videovax.tv.tek.com, {hplabs,uw-beaver,decvax}!tektronix!videovax!bill Phone: (503) 627-6920 "The biggest difference between developing a missle component and a toy is the 'cost constraint.'" -- John Anderson, Engineer, TI