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HD Radio Boosters and Single-Frequency Networks
This map shows a detail of the box referred to above. (The route taken in the NPR van is shown as the black/grey/white contiguous squares.) From this map of actual field measurements one can see along I-10 that, for the most part, the measurements indicate the digital signal was available between 97 and 100 percent of the time. As also predicted from the earlier map we can see that considerable interference was noted towards the eastern end of the measurement route.
As anyone who has constructed a booster knows, the goal is to have a net increase in the number of listeners that can get an easily useable signal; the hope is that there will be considerably more of those than are left with a diminished signal because of new interference. Measurement results would seem to indicate that with KCSN, a whole new area (south of the Beverly Hills and north of LA proper) were given access to KCSN's HD Radio signals.
The WD2XAB results (from the NAB Fastroad paper) are interesting in that they show before and after field measurements after an appropriate time delay was added in the booster's transmission path.
ComStudy was used to determine areas of predicted overlap between the two RF sources; that ended up being near Hartford road. As part of this experiment, iBiquity took RF spectrum measurements in the center of the predicted overlap region along Hartford Road.
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