Kurt,
The impedance of your 40 m dipole on 20 m is probably sky-high; 2.5:1
may be the best you can hope for. This probably won't hurt the rig, and
the power loss due to the high SWR is probably less than a dB assuming
the rig doesn't roll back power (or clip the voltage at the collector
of its PA).
Another thing you can try is to short the coax center connector to its
shield. This is an old trick for extending the matching range of an
antenna. Connect this to the T1's hot lead, then connect the T1's
ground to a ground counterpoise. The impedance will likely be very
different, giving the ATU a chance to match it. It will be slightly
noisier than a dipole, and the directivity will change, but you may not
mind.
73,
Wayne
N6KR
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http://www.elecraft.com
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