TAPR1.6

From: KC6HPN @ WB6YMH.#SOCA.CA

TAPR FULL-DUPLEX (NEW) 9600 BAUD MODEM MODS BY KC6HPN  (PART 4 OF 4)

(E) Solder one end of a thin, flexible wire to U18, pin 11 on the back side of
the modem board.  Bring the end of the wire up and around to the top of the
board, routing it alongside U18.  Connect the wire to point C (pin 11) on the
double buffer assembly.

(F) Next, connect a wire to point E (pin 7), ground, of the double buffer
assembly.  Solder the other end of the wire to the center pin of U5, the 7805
voltage regulator.

(G) Connect a wire to point D (pin 14), +5 volts, of the double buffer
assembly.  Solder the other end of the wire to the pin of U5 furthest from the
modem PC board edge.

(H) Carefully turn the assembly upright and insert a 74HC74 dual D flip-flop
IC into the socket.  Make sure the notch on the IC is on the same side as the
notch on the socket.

(I) Apply a thin strip of double-backed tape to the IC, invert the IC and
assembly and stick it to the modem PC board in the unused U6 location.

(J) Carefully power up the TNC and check for normal operation.

HINTS:  Use heat shrink tubing wherever possible to minimize exposed
connections.  Carefully premeasure all wire lengths before soldering.  Wires
to the assembly should be long enough to allow access to the IC, for insertion
and removal, but no longer.

- END OF TAPR MODEM MODS FILE -