Re: [IRCA] The 1130 problem

[bill kral <jwkral@xxxxxxxx>]

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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