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Welcome to the DRM Lecture Series entitled Transmission systems for digital shortwave using the DRM system which were conducted by John Stanley in Chile around March 2002. These lectures were transcribed from videotape, therefore some of the Q & A sessions have been omitted. For a copy of the videotapes, please contact John Stanley at jnrstanley@alum.MIT.edu for more details.



Transmission systems for digital shortwave using the DRM system
The lectures series are divided into 6 sections and they are as follows:-

Section 1     Introduction : What is DRM ?
Introduction : What is DRM ?
4 years of DRM
Broadcaster's Commitment
IBOC - DRM's Competitor ?


Section 2     Course Prerequisite and review
Course Prerequisite : Basic Technical Background
Time and Frequency Domain Concepts
Cooledit

Section 3     Nature of the signal to be transmitted

Section 4
Changes in Low Pass Filter (T6)
Introduction to Linear Technology's Switcher CAD III
Setup and Measurement of Digital HF Transmitter at Station Juelich
Digital Operation of 100 kW Transmitter at SWR Site Muehlacker Germany

Section 5
EER Testing
Transmitter Testing for Digital Readiness
Two Tone Testing for Linear Amplifiers and the EER Method
Peak-to-Average Ratio
A Tutorial on Peak to Average Ratio and Spectrum of Complex RF Signals, Using Cool Edit
6T1 Circuit Functions
6T1 Outputs
Phase Delay Control
RF Bandwidth
6T1 into DBM Results
Adjustments on 6T1 and Results
LTSpice to Simulate Defects

Section 6
Transmitter Modifications (applies to Harris SW-100 and similar)
Harris Changes for EER
Further Developments in the Use of the Harris SW-100 for DRM




This website was last update was on the 5th of Apr 2004.

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