dtv is from only channels 2 through 51. 52 through 69 are disappearing for the same reasons channels 70 through 83 and previously channels 84 through 114. Channels 2 through 6, 54 to 88Mhz are going to be mostly ignored by dtv. They are low frequency and require the long/wide elements on an antenna.They suffer interference from the FM radio broadcast bands and vice versa. Channels 7 through 13 are 174 to 225 Mhz. Channels 14 and up start on the upper side of the 470Mhz Ham and and two way radio bands. The so called "dtv" is usually built without the specific long elements for channels 2-6. This causes no loss on channels 7-52 and cuts the antenna width by 2/3 and reduces the length by half. My antenna has no elements for channels 2-6 but receives them just well as the old antenna. The TV signal maybe weaker but the amount of FM radio interference has also been reduced.It's about a draw on performance. The advantage is a much smaller antenna that doesn't wind load the tower and rotor as much. The main problems are old crummy RG-59 coax, no antenna amp, no rotor and a poorly designed/poorly constructed dtv converter box.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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