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FLEX-6000 Signature Series - SmartSDR for Windows Software User’s Guide

Page 122

31 HOW TO OPERATE IN DIGITAL MODES

With the introduction of DAX (Digital Audio eXchange), digital audio signals can be transferred from

the radio to third-party sound card applications without the need for a radio-to-PC audio interface

or a physical sound card in the PC. This method provides a signal path without multiple digital to

analog and analog to digital conversions, without injected noise and with higher dynamic range over

multiple channels. Using DAX is the preferred method for operating digital modes with the FLEX-

6000.

This procedure described here assumes that you have a working knowledge of operating digital

modes with your favorite sound card based digital mode program and will not delve into the details

of configuring specific third-party digital mode programs. For the examples in this procedure, Fldigi

v3.20.x will be used.

31.1 USING DAX FOR OPERATING DIGITAL MODES

Digital Audio eXchange, DAX, is a standalone radio client application that facilitates the exchange of

several kHz of audio data from a Slice Receiver with third-party programs on your PC by emulating a

sound card interface. It is designed to provide you with the audio from a Slice Receiver so the limits

on the Slice Receiver bandpass filter will set the limits on this audio passband. The Audio support is

bi-directional meaning you can both RX and TX. DAX supports up to 8 channels in the radio depending

on the radio model (see section 31.1.3 for details).

31.1.1 Connecting to the FLEX-6000 via DAX

To use DAX, there are two separate components; the DAX Control Panel which is a standalone

application and a Slice Receiver in SmartSDR that passes audio to a DAX Channel, or a Panadapter

that passes wide band IQ audio to a DAXIQ Channel.

31.1.2 SmartSDR for Windows Configuration with DAX Audio

Set DAX Audio Channel on Slice

Select one of the DAX channels in SmartSDR on a Slice Receiver. Each channel can be selected on

only one Slice Receiver. The radio prevents selection of multiple Slices per channel. The selection

is made in the DAX panel and the associated drop-down menu:

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