copied from the internet:
From: laduke@hpdmd48.boi.hp.com (Terry Laduke)
Newsgroups: rec.radio.amateur.misc
Subject:  FT-101 Mod for 30-meter (10MHz) Transmit

  I made several of these mods about ten years ago but I
am a little fuzzy.  The FT101 uses 10mhz for its WWV position but
they left out the driver and final coil connections in the
transmit section of the radio.  So you either add coils or you
can jump the band switch in the driver portion and the final
section.
     Connect a jumper from the 20meter driver coil tab, to the
WWV driver tab; and the 40 meter final coil tab to the WWV final
tab.
     This will make the driver tune in the 40meter position and
the final will dip around the 20meter position.
     A cheap mod for another band,  Good Luck but remember that
packet or rtty is continious power so you need to back off the
drive to about 1/3 normal or you will cook the finals!!!!!!
                              Terry  WA6RNF  @ Boise,Idaho
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Note: I haven't tried or verified this, proceed at your own risk.  WA2ISE
/EX