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- This is the instructions for interfacing the morse code input and output.
- USE AT YOUR OWN RISK. If you don't know what you are doing - DON'T DO IT.
-
- To connect a paddle to the joystick port all you need is a female DB-9
- and then you wire your paddle directly to the plug:
-
- Pin
- 2 DOT
- 4 DASH
- 8 GND
-
-
- If you also want to use the morse code output from the joystick port (with
- or without the PTT) then you need a small interface to connect the joystick
- outputs to your rig. The specific requirements of the interface depend upon
- your rig. Some rigs use a positive keying voltage while others use a
- negative voltage. Some use quite high voltages (e.g. -75V) on the keying
- input and so you not only must ensure that you get the right transistor for
- the job but that it can also handle the voltage on the keying line.
-
- For the IC-735 which uses a low positive voltage, a simple 2N2222 NPN
- transistor is sufficient for both keying and PTT.
- The circuit for them is:
-
- Code output.
-
- ____ KEY input to rig
- C/
- Joystick |/
- Pin 9 ----/\/\/\/\-----|
- 10K |\
- E\____ GND
-
- 2N2222
-
- ==================================================================
-
-
- PTT
-
- ____ PTT from rig
- C/
- Joystick |/
- Pin 5 ----/\/\/\/\-----|
- 10K |\
- E\____ GND
-
- 2N2222
-
-
- ==================================================================
-
-
- Even if you use the morse code output you do not have to use the PTT. You
- can use the VOX on your rig to key the rig if you wish. This is useful if
- you have semi- or fast- breakin. If you do not use the PTT it is best to
- put the command "x 0" in your defaults file so that PTT won't be generated.
-
- ==================================================================
-
- The above diagrams will NOT work with a PNP transistor and negative keying.
- I have not figured out a circuit that will connect the joystick output to
- a negatively keyed rig.
-