PK-232MBX – OPERATING MANUAL INTRODUCTION
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1.4.1 Modem Characteristics
Demodulator: Limiter-discriminator type, preceded by an eight-pole Cheby-
shev 0.5-dB ripple bandpass filter
Receive Band-pass: Automatically switched by operating mode
VHF packet: Center frequency 1700 Hz, bandwidth 2600 Hz
HF (except CW) Center frequency 2210 Hz, bandwidth 450 Hz
CW Center frequency 800 Hz, bandwidth 200 Hz
Modulator: Low-distortion AFSK sine wave function generator, phase-con-
tinuous AFSK
Output Level: 5 to 100 millivolts RMS into 600 Ohms, adjustable by a rear-
panel control
1.4.2 Processor System
Protocol conversion: Zilog Z-80 microprocessor
RAM: 32 kilobytes
ROM: Up to 128 kilobytes of ROM may be used
Hardware HDLC: Zilog 8530 SCC
1.4.3 Input/Output Connections
Radio Interface: Two five-pin Molex connectors, selectable on the front-panel
Input/Output Lines Receive audio
Transmit audio
± Push-To-Talk (PTT) (+25 / -40 VDC)
External squelch input
Ground
External modem
connector Five-pin Molex- TXD, RXD, DCD, PTT and Ground (TTL levels)
Direct FSK Outputs Normal and reverse
Oscilloscope Outputs Mark (Stop) and space (Start)
CW keying Outputs Positive: +100 VDC max., at up to 100 mA
Negative: -30 VDC max., at up to 20 mA
Terminal Interface: RS-232-C 25-pin DB25 connector
Input/Output RS-232-C with full handshake (hardware and software)
USE WIRES 1 THROUGH 8 AND 20 ONLY.
Terminal Data Rates Autobaud selection of 110, 300, 600, 1200, 2400, 4800 and
9600 BPS. TBAUD COMMAND adds 150, 200 and 400 BPS.
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