You are thinking of KQW in San Jose - which later became KCBS.   KPO became 
KNBR on 680.  ---  There is a plack at the old transmitter site of KQW, now 
used by the 1170 AM in San Jose.  But before KQW became KCBS on 740 --  KQW was 
on 1010 Khz.   KTRB in Modesto was assigned 740.   In the 1941 frequency sfift 
-- KQW was moved to 740 and KTRB was moved to 860.  ---  After 60 years -- KTRB 
moved the 860 to San Francisco and increasd power to 50 KW  and moved 840 into 
the Modesto area.   KQW used spark gap modulation.     
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