Here's a modification to the Yaesu FT-747GX to give you CW spotting
capability. I'm using it on mine. Schematic and instructions follow:
           J03
        +----------+                              ^ to +5 volts
        |to DN sw. |  1N4148          100K        |
        |    O---------|<|-------+---^^^^^--------+
        |to UP sw. |  1N4148     |               /       2N3906
        |    O---------|<|-------+    100K     |/  E
        |          |             +---^^^^^-----|         this circuit
        +----------+                           |\  C     on display
                                                 \       board
  ................................................|....................
                                                  | (shielded cable)
                                                  |
    this circuit                      1N4148      |  B _______
    on main         from Q36   ---------|>|-------+---|       |
    board           pin 7             (diode          | Q29   |
                                       replaces       +-------+
                                       jumper)


(1) Replace jumper at base of Q29 on main board with 1N4148 diode.
(2) Wire up 2N3906 circuit to display board.
(3) UP/DN switches on mike will still function, and in CW mode you
    will hear sidetone and can quickly spot proper frequency.
(4) The sidetone oscillator on my FT-747GX measured 724 Hz, very close
    to the 700 Hz CW offset in the FT-747GX, so by matching
    the tones I can quickly "zero beat" the desired signal.

WA4VLV @ N4NIA.GA.USA.NA
tijc02!jceng1!jkl141@uunet.uu.net

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