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 Handheld 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 longer shared with voice users so this connection
will probably not be needed.
This completes the minimum necessary connections for transmit and
receive operation with the PK-232. If you are interested in using the
PK-232 to transmit Morse code (CW) or transmit RTTY using FSK inputs
on your HF transceiver, the following three sections (3.3.6, 3.3.7,
and 3.3.8) should be read.
If you will not be using any of the connections described in the
following sections, then skip ahead to the Final Adjustment section
3.4 where you will set levels and prepare to go "On the Air".
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