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

Page 127

DAX will allow multiple PCs to use the same DAX channel(s). For example, you could use two PCs to

listen to the same frequency with different decoding programs. If more than one PC is used on the

same DAX channel, the TX selection in the DAX Control Panel will determine which PC will be the

source of the transmit audio. If you select TX in one DAX control panel for a given DAX Channel, all

other PCs will be deselected as the transmit audio source.

You can also see the data rate from the radio to the computer and the level being received from the

radio listed in kbps while transmitting. Use the sliders to set audio levels while keeping the peaks ~6

dB below the maximum.

The DAX control panel retains a memory of its position and size on the desktop. If it is visible when

Windows or the control panel is shut down, it will be visible when Windows or the control panel is

restarted. Similarly, if it was minimized, it will be restored in minimized state.

31.1.4 DAX Channels to Sound Device Mappings

There is a four-to-one mapping between DAX channels and the sound devices that are available on

your PC. Each DAX channel consists of an RX or receive audio link or conduit. There is one TX or

transmit audio link as only one Slice Receiver can be transmitting at any point in time. Each link or

conduit has two endpoints; a reserved endpoint that connects only to the radio and an audio

endpoint that is connected to the digital modem program running on the PC. So, for each DAX Audio

channel, you will see two RX sound cards and two TX sound cards.

Let's assume we're looking at DAX Channel #1. You will see:

• DAX AUDIO RX 1

• DAX RESERVED AUDIO RX 1

In addition, you will see the shared DAX transmit channel:

• DAX AUDIO TX

• DAX RESERVED AUDIO TX

You will connect your 3rd party software to the DAX AUDIO RX/TX sound cards. The ones marked

RESERVED are for internal use in the software, so you should never connect to them.

31.1.5 DAX TX Channel Switching

The DAX system implements a single dynamically switched transmit channel. There is no DAX TX

channel number. Since only one Slice Receiver can be enabled to operate the transmitter at any

given time, DAX automatically switches the DAX TX channel to the enabled Slice Receiver. To transmit

audio supplied by the DAX TX channel, the channel must be enabled in the DAX control panel, and

DAX must be selected as the input source in the P/CW panel.

Numerous digital modem programs can be configured to transmit via the shared DAX TX channel. At

any point in time, at most one of these programs will be transmitting, and if all the criteria mentioned

above are met, the DAX TX channel will be connected to that program.

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