RF Technology
Doug Lung is regional vice president of technology for a major station group. Contact him via e-mail at
dlung@transmitter.com.
Lessons Learned from the CES Mobile DTV Demo
by Doug Lung, 01.27.2010
While the technology is there, it was clear a lot of work will be needed to develop a system that is compatible with different video sources and display devices. More...
RF: Its Past and Future
by Doug Lung, 01.05.2010
TV Tech RF guru Doug Lung marks 200th column More...
Digital Coverage Is Hot at IEEE Symposium
by Doug Lung, 11.23.2009
The signal level required for reliable DTV reception has been a popular topic for IEEE Broadcast Symposium papers over the last 20 years. More...
A Digital On-Channel DTV Repeater (DOCR) Service
by Doug Lung, 11.02.2009
To fill in the coverage holes created in the move from analog to digital TV and to provide seamless mobile DTV coverage, many stations will need repeaters. More...
Analyzing DTS Coverage With Longley-Rice, SPLAT
by Doug Lung, 09.02.2009
Analyzing coverage and interference in a distributed transmission system is not much more difficult More...
DTV Coverage Problems
by Doug Lung, 08.11.2009
This month I'll focus on relatively low-power synchronized transmitters and how they can improve reception. More...
RF at the 2009 NAB Show - Part 1
by Doug Lung, 07.02.2009
The success of mobile DTV will depend on reliable coverage. More...
Improvements in Propagation Models
by Doug Lung, 05.01.2009
This month, I'll look at an ITU propagation model that could replace Longley-Rice and some major updates to the popular open-source SPLAT! propagation software. More...
Solving VHF DTV Reception Problems
by Doug Lung, 04.23.2009
Many TV stations with high-band VHF analog channels are moving their DTV transmissions to those channels after analog is shut down on June 12. More...
Fixing DTV Coverage Problems
by Doug Lung, 02.10.2009
Low-VHF analog TV stations with UHF DTV channels experienced the biggest loss in DTV coverage. Even with 1,000 kW of effective radiated power, a UHF DTV service area contour usually will not match the low-VHF analog Grade B More...
DTV Transition Survival Guide
by Doug Lung, 01.05.2009
While it's probably too late to make any major changes before the analog shutoff next month, there are steps broadcasters can take to avoid unpleasant surprises. More...
2008 IEEE Broadcast Symposium in Review
by Doug Lung, 12.04.2008
This month, I'll discuss some of the papers presented at the 58th Annual IEEE Broadcast Symposium that focused on TV broadcast RF topics and the U.S. DTV transition. More...
Polarized Power for TV Broadcasting
by Doug Lung, 10.29.2008
Once the decision is made to transmit an elliptical polarized signal, the next decision is how much power to devote to the vertically polarized (v-pol) signal. More...
Circular Elliptical Polarization for TV
by Doug Lung, 10.01.2008
Broadcasters have watched the number of people receiving TV service over the air drop in comparison to the number of people receiving TV over cable or satellite. More...