Here is the mod for the DX440 and Sangean ATS-803A that allows you
to hear the receiver as you spin the dial instead of getting muted.
I don't know who the original poster was, but I don't take credit
(or blame) for this mod, but it does work.
 
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                Sangean 803 / DX440 Modification
 
The following mod will remove the "chuffing" heard while tuning the
Sangean 803/DX440 radios.
 
WARNING:  a.    This operation will void your warrantee.
          b.    You do this at your own risk.
 
1. Place the radio face down on a suitable surface and orientate it so
   that the base of the radio is towards you.
 
2. Remove the battery cover and take out the D-cells.  You do not need to
   remove the AA batteries but you will lose your clock and memories, so
   make a note of them before you go on.
 
3. Remove the six screws which hold the back of the radio in place.  One
   of these is in the battery compartment.
 
4. Lift off the back cover and swing it over towards your left to lay it
   down.  This is to avoid breaking off the wire going to the whip
   antenna.
 
5. Locate the 8-wire flat cable which runs from the circuit board above
   the loudspeaker on your right horizontally across to the rf/if board. 
   The cable plugs into an 8-pin socket which is located almost dead
   center in the radio on the rf/if board.
 
6. Carefully remove the cable from its socket.  Identify the second wire
   from your left in the cable.  (Second to last on the side furtherest
   from the loudspeaker.)  Bend this wire up and out of the way (or cut
   it off!) so that it will not plug back into the socket or make contact
   with the socket in any way.
 
7. Carefully plug the cable back into the socket and check that the wire
   you modified is not making contact with the socket.
 
8. Repeat steps 4 through 1 in reverse order and reprogram your clock and
   memories.
 
9. Turn on the radio and enjoy the lack of "chuffing".  (You may still
   hear a "thud" while tuning across a strong station.)
  
Remember:  a. This will void your warrantee but if done carefully it is
              reversible.
 
           b. Follow the above instructions at your own risk.
 
 
 
 
The main purpose of the muting circuit that gets disconnected by this
modification is probably to make the set silent when you hit the
"search" button. I personally think that it is a feature to hear the
"search" in operation. 
 
The reason why the set is "chuffing" is a result of a bad desing of the
mute circuit:
   It is placed where there is a DC potential.
   It is placed after the volume control (less audiable if placed 
before).
 
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Brett Miller  N7OLQ @ N6LDL.#NOCAL.CA.USA
brett@micromed.com

-- 
brett@micromed.com (brett miller)


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