mt2060_spurcalc
Spur=mt2060_spurcalc(lo1,lo2,if2);
Sp1 = mt2060_spurcalc(lo1+I,lo2+I,if2);
Sp2 = mt2060_spurcalc(lo1-I,lo2-I,if2);
Spur = mt2060_spurcalc(lo1+I,lo2+I,if2);