PK-88 OPERATING MANUAL
INSTALLATION
2 - 2
PK-88 - 18
2.2.2
Radio Input and Output Connections (See Table 2-1)
We supply a shielded cable with your PK-88. You must supply and connect the plugs for
the cable ends. This cable connects your PK-88 to your radio's microphone receptacle or
PTT and phone patch/tone inputs.
NOTE:
Wire only the PK-88 cable end at this time. Leave the "radio" end unwired.
You will use the radio cable in a test configuration during your first 'loopback'
experiments with Packet operation.
Four signals and ground pass between your PK-88 and your radio via eight-pin receptacle
P2. The pin wiring is shown in Table 2-1.
Pin 2.4
Signal Name
Color
2.2.6
Description
1
3
2
8
7
Ground
Push-To-Talk
Microphone audio
Receive audio
Squelch input (Optional)
Brown
Red
White
Green
Black
Audio and PTT common return
PK-88 keys transmitter
AFSK from PK-88 to transmitter
AFSK from receiver to PK-88
Allows PK-88 to detect activity on a
shared-mode-channel (optional)
NOTE: The remaining pins are not connected.
Table 2-1
J2 Radio Port Connector
2.2.3
Computer Connections (See Table 2-2)
NOTE:
The serial interface in the PK-88 comes from the factory configured for RS-
232C voltage levels. Please see Appendix B for the TTL header installation in-
structions if your computer does not support RS-232C.
The PK-88's rear-panel serial port connector carries data and control signals between your
computer and the PK-88. The PK-88 is connected to a computer just like you connect a
RS-232C modem. If you now use your computer with a modem, connect the PK-88 the
same way. Use any terminal program you now use with your modem. The minimum num-
ber of pins that must be connected is shown in Table 2-2.
NOTE:
The following are the least number of wires you can use to connect the PK-
88 with a computer or terminal. This three-wire connection does not permit
hardware flow control. In this case, software flow control (XON-XOFF) must
be provided by the terminal program.
Pin
Signal Name
Description
2
3
7
Transmit Data
Receive Data
Signal Ground
Serial data from computer to PK-88
Serial data from PK-88 to computer
Common ground for both data lines
Table 2-2
Minimum Serial Port Connections Required by PK-88
