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PK-88 OPERATING MANUAL
1.2.2
Modem Characteristics
Modulator/Demodulator:
Data format:
Modem Tones:
Transmitter:
Modulation method:
Frequency accuracy:
Harmonics:
Receiver:
Demodulation method:
Output Level:
1.2.3
Processor System
Protocol conversion:
RAM:
ROM:
Hardware HDLC:
1.2.4
Input/Output Connections
Radio Interface:
Input/Output Lines
External Modem Interface:
TTL Input/Output Lines
Terminal Interface:
Input/Output Lines
Terminal Data Rates
1.2.5
Controls and Indicators
Front Panel Controls:
Status and Mode Indicators:
AMD 7910 'World Chip' modem.
Serial, asynchronous
Bell 103 and Bell 202
Binary, phase-coherent NRZI FSK
Bell 202 (mark) ± 1 Hz
All others (mark) ± 0.4 Hz
45 dB below fundamental, single tone
Differential FM detection
5 to 100 millivolts RMS, adjustable by internal control
Zilog Z-80 microprocessor
32 kilobytes
Up to 48 kilobytes of ROM may be used
Zilog 8530 SCC
Eight-pin microphone connector
Receive audio
Transmit audio
Push-To-Talk (PTT)
External squelch input
Ground
Pins 13 through 17 of Connector J1
Receive data (RXD)
Transmit data (TXD)
Transmit Clock (TXC)
Data Carrier Detect (DCD)
Ground
Standard RS-232C 25-pin DB25 connector
RS-232C (CCITT V.24/V.28) with full handshake (hard-
ware and software)
Auto-baud selection of 300, 1200, 2400, 4800, and
9600 BPS. TBAUD adds 45, 50, 57, 75, 100, 110, 150,
200, 600 and 19,200 BPS terminal rates.
Power Switch
CONV, TRANS, CMD, SEND, DCD, STA, CON, MULT,
PWR
1 - 2
INTRODUCTION
PK-88 - 15
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Troubleshooting
