The interference problem on 1130 in the CKWX coverage area might be happening because there is a significant reduction of ground wave strength east of the flatland Tx location due to a rapid rise in topography (just a few miles east of the Fraser River delta),which is higher than the height of the towers of CKWX and other Vancouver stations which have their towers on the marshes or farmlands just south of the city.This plateau extends from around Surrey eastward for about 10 miles and drops down again to just above sea level near Langley and includes a few higher elevations which produce enough signal loss in that direction to reduce the strength enough to create some dips in the ground wave. The same thing happens to the north of Vancouver where high mountains block the signal.Here in Victoria,CKWX has a clean signal at night with just a hint of "unders" audible when their signal is nulled. Bill in BC
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