Modulation Dependent Carrier-Level control (MDCL) Stephen S. Lockwood, P.E. Hatfield & Dawson Consulting Engineers 9500 Greenwood, Ave, Seattle, WA
[email protected] NAB Fall Radio Show 2011 Hatfield & Dawson Consulting Engineers NAB Fall Radio Show 2011 Hatfield & Dawson Consulting Engineers 1 Green Vs. Green If it is not a good financial decision I seriously question if it is a good “green” decision NAB Fall Radio Show 2011 Hatfield & Dawson Consulting Engineers History • Concepts date from 1930 • Renewed interest in late 1970-1980 when energy cost increased • Work done by: – British Broadcasting Corporation – Brown Boveri (BBC – ABB) – AEG-Telefunken • Systems currently implemented by: – North American Manufactures: Harris & Nautel – European Manufactures: Thomson, Transradio, Riz & Others NAB Fall Radio Show 2011 Hatfield & Dawson Consulting Engineers 2 Energy Savings Methods • HaPuG – Harbich, Pungs & Gerth • Dependent Amplitude Modulation (DAM) • Dynamic Amplitude Carrier Modulation (DACM) • Dynamic Carrier Control (DCC) • Amplitude Modulation Companding (AMC) • Adaptive Carrier Control (ACC) • Dynamic Amplitude Modulation (DAM – again?) • Modulation Dependent Carrier-Level control (MDCL) NAB Fall Radio Show 2011 Hatfield & Dawson Consulting Engineers Variations on Two Methods • Reduction of carrier level during lower modulation levels – DAM, DACM, ACC • Carrier is reduced at higher levels of modulation – AMC • DCC – has been used to describe both methods • Modulation Dependent Carrier-Level control (MDCL) for the generic description