WB6JHQ REPEATER CONTROLLER


                               ERRATA SHEET            06/11/97

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       1.      DO NOT INSTALL C18 OR R1.  IN PLACE OF THESE COMPONENTS PUT
               TWO 27pf CAPS. CX & CY. PER THE COMPONENT PLACEMENT DIAGRAM.
               Solder the two 27 pf. caps. together close to the body.  Then
               cut one lead of the soldered leads off.  Put the remaining
               lead through the left hand hole of the C18 location.  Solder
               each of the leads on the other side of the 27 pf. caps. into
               the holes for R1.  This puts a 27 pf. cap. to ground from
               each side of the 4 Mhz. crystal.

       2.      SOLDER RX (4.7K) ON THE BOTTOM OF THE BOARD FROM U2 PIN 4 TO U2
               PIN 36.  THIS IS A PULLUP RESISTOR FOR MI (IRQ).

       3.      ADD RES. RZ  (1K) FROM U7 PIN 14 TO U7 TO PIN 10.

       4.      Add Res. RY (2.2k) on the bottom of the board from pin from
               pin 17 of U4 to the via hole just below R16. 

       5.      ALL TRANSISTORS ARE MOUNTED WITH THE FLAT SIDE toward the top
               of the board.  IGNORE THE SILK SCREEN ON THE BOARD.
               THE FLAT SIDE SHOULD BE FACING TOWARDS U4 (THE 6821)
               FOR T1 THROUGH T7.  THE FLAT SIDE OF T8 FACES TOWARD U8
               (THE LM556).

       6.      WHEN ADJUSTING THE 1 HERTZ TIMER START WITH R4 FULLY CLOCKWISE.  
               DO FUNCTION F32, 1 HERTZ POT. ADJUST
               AND TURN POT. CCW SLOWLY FROM THE FULL CW POSITION UNTIL
               THE LED ASM LIGHTS UP.  THEN SLOWLY TURN CW UNTIL ALL LEDS
               GO OFF.  THIS WILL GET THE TIMER TO APPROXIMATLY 1 HERTZ.
                 SOME FINE TUNING MAY BE DISIRED TO GET WINDBAG TIMER TO
               3 MINUTES.  I FOUND THIS PROCEDURE GETS VERY CLOSE USING
               THE 4 MHZ. CRYSTAL THAT IS DIVIDED BY 4 IN THE 6802 AND
               COUNTING MPU CYCLES TO GET 1 HERTZ.  73, CHUCK

                Ref. photos of board.