I already tested the Zenith DTT900 versus Dish DTVpal. Although both received 4 stations, the DTVpal had lots of macroblocking on the weak channels so there was effectively only 1 watchable station. 4 stations versus only 1.
Here are my results with Zenith DTT900 versus the Channel Master CM7000:
- Rabbit Ears = 4 stations versus 5 stations.
- CM4228 = 8 stations versus 13 stations.
- Amplified settop antenna = Same number of stations on both boxes (5), but the Zenith experienced breakups, whereas the CM7000 was a solid 99-100 the whole time. No freezing or macroblocking.IMHO the CM7000 is the better box, with the ability to display stations as low as 10 on the strength bar.
At 10 the picture sometimes "smears" like a water-color painting, but at 20 it looks near-perfect. I was able to watch an entire episode of Cold Case from Philadelphia 50 miles away and it hovered between 15-40 on the strength bar. It appears the CM7000 has better error-correction.
Originally Posted by videobruce
Just where did that come from? Both have the same bandwidth, S video just separates the Y and C channels.
Yes true, but the Chroma is laid-over-top of the Luma, and most televisions simply "cut-off" the luma at 4 megahertz, thereby bandlimiting the maximum resolution to 320-330 horizontal per picture height. Anything above 4 megahertz is directed to the chroma decoding circuitry.
More expensive televisions with COMB filters can boost the resolution higher, but even they have limits to how much Luma they can "pull out" of the Chroma section of the band. The better solution is to simply leave the Choma and Luma separate to get the maximum resolution. (ALSO: Please note I used the word "about" in my statements, in order to provide for variance between sets.)
In real-world testing, the CM-7000 menu was difficult to read with Composite, but just as crystal clear as a VGA monitor after I switched to S-video.