PK-232 MBX – OPERATING MANUAL RADIO INSTALLATION
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3.3.5.3 Prepare the Connector
Now that the cable is prepared, you are ready to prepare the connector for wiring. If the
connector you are wiring has a shell, be sure that it is placed over the cable before any
connections are made. If this is not done, an otherwise perfect wiring may have to be re-
done.
3.3.5.4 Wire the Connector
The following connections must be made for transmit and receive operation of the PK-
232. Refer to table 3-1 and figure 3-2 as well as APPENDIX E and your transceiver's man-
ual when making these connections.
HINT: When wiring a Connector, it is often easier to wire the inside or middle con-
nections first and work your way to the outside pins. For this reason the fol-
lowing steps are not numbered and may be done in any convenient order.
o Connect the Shield/Drain wire (Silver wire with no insulation) to the Microphone
GROUND connection if your transceiver has one. If your transceiver does not have a
separate Microphone or Audio-In Ground connection, then this wire should connect
to the single Ground along with the Brown wire. See the next step.
o Connect the BROWN wire to the main GROUND on the connector. This Ground is the
one used for the PTT and receive audio. You should connect the Silver Shield/Drain
wire to this GROUND only if there is not a separate Microphone Ground as described
in the previous step.
o Connect the RED wire to the Push-To-Talk (PTT) terminal on the connector. At this
time, check the manual to determine whether your transceiver uses positive (+) or
negative (–) PTT. The PK-232 comes from the factory set for Positive PTT since most
transceivers use this method of keying. This will be discussed in more detail in the
Adjustment sections below. If you are connecting a Handheld transceiver to your
PK-232, you will probably need a resistor and/or capacitor to isolate this connection
from the AFSK audio. Check APPENDIX E.
o Connect the WHITE wire to the MICROPHONE AUDIO terminal on the connector.
This connection carries the low to medium level Audio Frequency Shift Keying
(AFSK) to the transmitter's microphone audio section. If you are connecting a Hand-
held transceiver to your PK-232, you will probably need a resistor and/or capacitor
to isolate this connection from the PTT. Check APPENDIX E.
o Connect the GREEN wire to the RECEIVER AUDIO terminal on the connector. If the
connector you are wiring does not have receiver audio available, then the included
3.5 mm Audio Cable may be used. This cable connects audio from your transceiver's
external speaker/earphone jack to the RX AUDIO IN Jack on the PK-232. For the PK-
232 to operate properly, we recommend at least 200 mV RMS of receive audio be
available. If you are connecting to an Accessory Jack, make sure the available level
is at least 200 mV RMS. For CW work 400 mV may improve operation.
o If you will be using a Packet-Radio channel that is shared with voice users then you
should connect the BLACK wire to the SQUELCH status pin of the connector. This
will prevent the PK-232 from transmitting when there is a received signal strong
enough to open the Squelch. If you connect this pin you may have to change the
setting of the SQUELCH command in the PK-232. Most VHF/UHF Packet are no lon-
ger shared with voice users so this connection will probably not be needed.
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