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-900 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-900, 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 level Audio Frequency
Shift Keying (AFSK) to the transmitter's microphone audio
section. If you are connecting a Handheld transceiver to your
PK-900, 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. For the PK-900 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-900 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-900. Most VHF/UHF
Packet channels 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-900. If you are interested in using
the PK-900 to transmit Morse code (CW) or transmit RTTY using FSK
inputs on your HF transceiver, the following three sections (3.3.6
and 3.3.7) 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".
1/93 3-5
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