Specifications

1.4 PK-900 Specifications
As part of its program of product improvement, AEA reserves the right
to make changes in this product's specifications. Changes may also be
made to the information in this document and incorporated in revisions
to this manual. Prices and specifications are subject to change
without notice or obligation.
1.4.1 Modem Characteristics
Port 1:
Demodulator: Programmable Limiter-discriminator type,
preceded by an 8-pole Chebychev 0.5-dB
ripple bandpass filter.
Receive Band-pass: Automatically switched by operating mode
VHF packet: Center frequency 1700 Hz,
HF (except CW) Center frequencies: 1700, 2210,
2337.5 or 2550 Hz depending on
frequency shift chosen.
Bandwidth: 200, 470, 725, or 1150,
optimized for operating mode.
CW Center frequency 750 Hz,
bandwidth 200 Hz
Modulator Crystal controlled, 1 Hz step
programmable, phase-continuous, Direct
Digital Synthesis sine wave generator
Output Level: 5 to 100 millivolts RMS into 600 Ohms,
adjustable by a rear-panel control
Port 2:
Modulator/Demodulator AMD 7910 'World Chip' FSK Modem
Modem Tones: Bell 103 and 202
Output Level: 5 to 100 millivolts RMS into 600 Ohms,
adjustable by a rear-panel control
Options: 9600 baud direct FSK packet modem
(G3RUH/K9NG compatible)
Grey scale HF FAX receiving program
1.4.2 Processor System
Protocol conversion: Zilog Z-180 (64180) microprocessor
RAM: 64 Kilobytes
ROM: Up to 256 Kilobytes of ROM may be used
Display and memory ARQ
processor: 68HC05B4
DSS processor: 68HC05C4
Hardware HDLC: Zilog 8530 SCC
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