TS-520 CW/SSB FILTER SELECT MODIFICATION
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Those of you who own a TS-520 (series) transceiver have found that when copying
"weak" CW signals, the 500 Hz filter makes difficult. The following mod will
enable you to switch the 500 Hz CW filter in/out:
    1. Most TS-520 owners don't have any crystals in the FIX CH slots, so
use positions 3 (WIDE) and 4 (NARROW) for filter switching. This is done by
"bridging" the terminals on the back of the FIX CH switch.

     A. FIX CH 3 terminal <---------> IF SSB terminal
     B. FIX CH 4 terminal <---------> IF CW terminal

Placing the FIX CH switch to position 3 will operate the 500 Hz CW filter,
position 4 will operate the 3 KHz SSB filter. Have fun !!! 73, Steve