TH22AT.1

  The following are modifications which will extend the RX and TX range
  of the Kenwood mini-HT's  TH22AT  and  TH42AT.  My thanks to the two
  individuals back in 9 land who supplied them to me.

  
  Disassembly:   1. Remove soft case and belt clip if used.
                 2. Remove battery and antenna.
                 3. Remove knobs by pulling them off.
                 4. Gently pry off rubber escutcheon from top of HT.
                 5. Remove two screws on back of case holding the
                    front and back together.
                 6. Gently squeeze plastic half of radio on sides
                    and pull back half away from front half.
                 7. Take care not to damage silver interconnect ribbons.

  Modification:               
                 Remove W 202  on control board.  (one of two green
                 jumper wires).

  Important Note:
                 This mod has been confirmed on my TH42AT and works
                 well.  This is not the mod I originally did on my
                 TH22AT.  On the 2M radio I was advised to remove
                 SMA diode D208 and install it where diode D212
                 should go.  You should note on the schematic that
                 W 202 is in series with D208 and removing it has
                 the same effect as removing diode D208.  If you
                 want to take the risk (minimal in my opinion) you
                 can try the removal of W 202 on the 2M rig too
                 instead of removing the D208 diode and see if it
                 is really necessary to move D208 to the D212 spot.
                 This is much easier than trying to remove and
                 reinstall these very small SMA diodes, and likely
                 successful as the control boards and schematics of
                 the two radios appear to be nearly identical in these
                 areas.
    
  Good luck.  Ed  WB6SAT