American QRP Club NUE-PSK Manuel de l'opérateur - Page 3

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1) Introduction

PSK31 is one of the latest communications modes to capture the interest of hams

worldwide. Its inherent ability to dig out weak, nearly-inaudible signals is ideally suited

for low power QRP enthusiasts. The PSK31 digital modem engine, however, requires

intense DSP processing that is only commonly available in PC sound card. Thus the

PSK operator desiring portability for field operation is locked into using a laptop

computer as a controller, which results in a cumbersome station. But there's hope!

The NUE-PSK Digital Modem offers a unique way for hams to get on the air using the

digital modes. No PC is required, thus enabling one to communicate using PSK31. This

self-contained, hand-held modem connects to your SSB transceiver and allows you

send and receive text data using the PSK31 digital mode.

PSK31 is actually one-of-many modulation techniques within the "phase shift keying"

family of communication. PSK31 operates at 31.25 bits/second, while other speeds may

be achieved using variations to the software algorithm. PSK is perhaps more accurately

termed BPSK, for bi-phase shift keying, whereby two distinct phase states separated by

180 degrees are used to convey the information. Four states may also be

encoded/decoded, as is done with QPSK (quad-phase shift keying), in order to provide

higher speeds with greater error correction ability.

The NUE-PSK digital modem can currently support the digital modes of BPSK and

QPSK, and will soon support MFSK and RTTY. In fact, the field updating capability –

that is, the ability to download new/improved programs from the Internet and simply

program them into the modem – will allow users to stay current with new features and

modes for years to come!

2) Connections

Ideally, you just need to connect up two cables:

a) Connect the modem's "Radio" cable to the "data" jack on the back of your SSB

transceiver. Most radio manufacturers today provide this way for getting audio

modulated tones to/from the rig.

b) Connect a standard PS2 keyboard, or a PS2/USB combination keyboard, to the

"Kbd" jack on the modem.

You are now ready to rock & roll using PSK31 ... read on and enjoy!

NUE-PSK Digital Modem Operator's Manual, ver 1.30c