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PK-88 OPERATING MANUAL
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
Signal Name
1
Ground
3
Push-To-Talk
2
Microphone audio
8
Receive audio
7
Squelch input (Optional)
NOTE: The remaining pins are not connected.
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 instructions 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 number 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
2
Transmit Data
3
Receive Data
7
Signal Ground
Table 2-2 Minimum Serial Port Connections Required by PK-88
Color
Brown
Red
White
Green
Black
Table 2-1
J2 Radio Port Connector
Description
Serial data from computer to PK-88
Serial data from PK-88 to computer
Common ground for both data lines
2-2
Description
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)
PK88-20
INSTALLATION
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