18
Any of these microphone jacks can be used with the StationPro, although the two on the left
will require washers to clamp them to the 5/8” hole in the front panel
You can “mix and match” microphone jacks in the StationPro, e.g., using one 8-
pin and one 4-pin jack. Also, you can easily configure the SP-II so that a microphone
wired for, say, a forty-year-old Collins KWM-2 transceiver, can be used with a modern
Elecraft K3 transceiver, even though the mic connectors are different
. Note, however,
that vintage microphones using a single shielded cable to carry audio signals (as opposed
to modern microphones having dedicated mic+ and mic- conductors) are particularly
susceptable to hum caused by ground loop currents. Before installing jacks intended for
such microphones (such as the 2-pin 5/8 in. jack – second from the right in the above
photo), you should carefully read
Appendix A: Avoiding Ground Loop Complications
at the end of this manual
III. Front Panel Assembly
The front panel is the most complex part of the entire assembly process, so we
will get it out of the way first. Begin by reading through these instructions. Then identify
the front panel circuit board and, referring to the parts listing shown below, collect all of
the components. (Additional information about each component is in
Appendix B: SP-II
Parts List
, at the end of this manual. Also, photos of most components are shown in the
step-by-step directions that follow.) Note that components mount on both the front and
rear sides of the front panel circuit board, as indicated by the white silkscreened legends.
Also note that Header H302 is unused, even though its outline is shown on the circuit
board
SPII Front Panel Parts List
IC socket
18 pin
DIP 18 pin IC socket
C301-C307
1000 pF
Capacitor, 50V, epoxy-dipped ceramic, qty 7
C308, C309
47 pF
Capacitor, 50V, epoxy-dipped ceramic, qty 2
C310
0.1
µ
F
Capacitor, 50V, epoxy dipped ceramic, qty 1
C311
1
µ
F
Capacitor, electrolytic, 50V, qty 1
DS301-DS304,
DS308, DS309
LED
LED, Green, qty 6
DS306-DS307
LED
LED, Yellow, qty 2
