[Elecraft] a few basics please, watt to watt compare

[MC Carpenter]

Can one of the more experience members help on this one,

watt to watt,  
meaning in the 3 to 5 watt range ,  the lower the frequency,  say 40 meters, at night the longer the skip, there fore the longest contact possible, except in summer when its best in early morning hours round four  AM or so. So anyone trying for contacts in mid day would be best to use 10 meters or higher  and in winter months,   Is this right,   the reason is that I never hear anyone on 80 or 160 meters but 10 meters in the day is a circus trying to sort out the over lapping  and all the signals sometimes.  I am wondering if this is the reason that Elecraft does not have 160 and 80 on there small CW units, I have never heard any signal from South America like Brazil , not even one when DX's,  yet I am told there is plenty of action on 160 and 80 in that region of the world