[Elecraft] KPA-1500: Widely varying drive requirement - same frequency, different antenna

[N4ZR]

I have two 40M antennas, a Carolina Windom and a full-wave parasitic 
sloper.  I have just noticed that on any given frequency, my K3 must 
deliver considerably more power on one than the other, in order for the 
amp to produce 1500 watts.  The difference is 27 watts on one vs 42 
watts on the other.  Is this normal?

-- 

73, Pete N4ZR
Check out the Reverse Beacon Network
at <http://reversebeacon.net>, now
spotting RTTY activity worldwide.
For spots, please use your favorite
"retail" DX cluster.