AT&T Vice President Joan Marsh questioned conclusions in a report...
AT&T Vice President Joan Marsh questioned conclusions in a report by lower 700 MHz block licensees analyzing the relative impact of Channel 51 and E block signals on Band 12 and Band 17 devices, filed at the FCC last week…
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(CD July 16 p10). “The lengthy report claims to show that Band 12 LTE devices are unlikely to experience interference levels high enough to translate to reduced performance in a 700 MHz B and C block LTE deployment like that being completed by AT&T,” Marsh wrote (http://xrl.us/bnhcee). “While we have not yet had a chance to fully review the submission, even a cursory review of the report raises significant credibility issues for both the testing methodology employed and the field results submitted.” Among them is that the report is based on field tests using Band 12 devices in Waterloo, Iowa, even though the nearest Channel 51 transmitter “located about 30 miles away from Waterloo proper, and the drive route used for the testing was largely in the surrounding countryside even farther from the Channel 51 tower,” she said. “It is not surprising that Channel 51 transmissions originating up to 40 or 50 miles away would have little or no measurable impact on the performance of a Band 12 device -- at that distance the Channel 51 signal is simply too weak to cause a strong interfering reverse intermodulation product."