Barrett HF SDR 4000 Series, Руководство пользователя

Страница: 7 / 38

7
DIGITAL VOICE AND SECURE DIGITAL VOICE - OVERVIEW
This manual describes utilising Digital Voice (DV) and encryption (Secure Digital
Voice (SDV)) for HF radio with the different Digital Voice (DV) and Secure Digital
Voice (SDV) products available from Barrett Communications. Details on how to
install, configure and use the DV and SDV products with Barrett 4000 and 2000
series HF Transceivers are covered in this manual.
Digital voice can improve the reliability of communications over noisy channels
where reception of analogue voice can be very poor. Poor voice quality can
be improved mark edly by the use of digital voice modules to the point where
barely usable frequencies are made clear. SDV allows users to encrypt their com-
munications over HF therefore providing a secure HF network.
Both DV and SDV capability can be utilised in Barrett 4000 and 2000 series HF
Transceivers using Barrett digital voice modules which are designated as:
DV Digital Voice module with no encryption
SDV-56 Secure Digital Voice module with DES 56 encryption
(No export licence required)
SDV-256 Secure Digital Voice module with AES 256 encryption
(Export licence required)
Signal-to-noise ratio conditions can change during communications between
HF stations. The digital voice modules have auto baud capabilities which auto-
matically adjust baud rates up or down whilst communicating between the
transceivers allowing the users to transmit and receive signals with optimal
voice clarity.
PLEASE NOTE, the SDV-56 and SDV-256 are not compatible due to dif-
ferent baud rate capabilities.
Introduction