There are two audio cables. The preparation is the same for both.
Only the connections to the interface are different.
| Before you start, unscrew the metal audio connectors and
slide the orange and white cable through the spring, then the
cover and finally the clear plastic protector. Now strip
back a few inches of the cable. This cable is like the
yellow cable you worked with for the serial port. This
time we will wire both black and red and ground wires. |
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| Strip the red and black wires so there is only about 1/2
inch of insulation exposed. But leave the wire a lot
longer as it's easer to handle. Carefully twist the wire
ends together to make then smooth. Cut off the very end at
an angle so it's sharp. Now push the wire through the
small holes on the connector. Make sure they go in the
holes indicated. I know it's a tight fit, but they will go
through as in the picture. If it turns out you can't get
it to go then the second best way is to just tin the connector
and tin the wire and then solder them both together. No
matter which way you do it, make sure the wires are short
and not touching each other. |
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| That should leave the bare wire. Wrap it around the back of
the connector and solder. Use pliers to pinch the end of
the connector to lightly hold the cable body. Now slide
the clear plastic protector over the connector body. Then
screw the body together. Do the same to the other cable. |
 |
You should now have a white and orange cable with connectors on
one end and the other end still raw. Lets take advantage
of this and test your soldering job.
- Strip a few inches off the raw ends and strip back 1/4
inch of insulation on all the wires.
- With an Ohm meter test to make sure there is an open
between the red, black and bare wires.
- Check to see a short between the red wire and the tip of
the connector. (Very end of the connector)
- Check to see a short between the ring of the connector
and the black wire. (Middle ring on the connector)
- Check for a short between the bare ground wire and the
sleeve of the connector. (Body of the connector)
If all checks out okay.. Woo-Hoo.. we are in the home stretch
now. Lets attach the two cables to the board.
|
| The black wire isn't used at this time so as before, wrap it
around the cable body so it can be used later. Do this to both
cables The Orange cable : Put the bare ground wire through
hole C-13 and pull tight and solder to F-13. Now run the
red wire through hole E-16 to the loose transformer wire at F-16
Solder both together |
 |
The White cable: Push the bare ground wire of the white cable through
hole E-10 and solder to the common ground at F-10
Push the red wire through the hole at E-8 and solder it to
the loose end of the transformer at F-8 Solder both
together. |
 |
| Now all we need to do is lash down the 3 cables so we don't
break then off. Use the supplied bare wire to lash the
wires down. I suggest you start the wire in a spare hole and
solder it to keep it from moving. I just wound it in and
out a few times and then pulled it tight and soldered it in
place. It isn't critical. Just make sure you don't cover
the mounting holes. |
 |
| A quick check should show the following: The red wire from
the orange cable should be connected to B
The ground from the orange and white cables should be connected
to C
The red wire from the white cable should be connected to D |
 |
| This finishes up the computer cables.
The white cable is the soundcard's audio line out or speaker
The orange wire is the soundcards audio line in or microphone
If you have a choice, use the computers line in and out
connectors.
Now lets test this baby once more.
- Now you should read about 67 ohms between the connector
tip and the connector body.
- You should read about double that between the two
connector tips. ( about 134 ohms ).
- Measure zero (short) between the serial connector pin 5
and the two audio connector bodies.
The Club Website will have the latest version of
these directions.
Take a look at
http://w4fhu.org/digital or
contact me at joel@cyberbest.com |
