RADIXON WR-G35DDC EXCALIBUR ULTRA, User Manual

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WiNRADiO G35DDC HF Receiver
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Appendix F – Recording File Formats
The DDC recorder can record the DDC stream in a standard WAV file format,
but saves the files with an extension “ .ddc ” in order to avoid confusion with
audio wave files. The proprietary WiNRADiO RXW file format (extension
“ .rxw ”) is often a better choice, because it also contains additional data such
as the current DDC center frequency, date, time and internal compensation
data, which makes it possible to simulate original conditions during the
playback. When replaying an
RXW recording, the recorder panel shows the
original time of the played back signal and the DDC spectrum scope shows the
original DDC frequency. If “
Waterfall timestamps ” option is enabled, the DDC
waterfall also shows the original time in its vertical axis.
All DDC files are stereo (as they are stored in the I/Q form) and 32 bit, except
for 3.2 MHz and wider DDC bandwidth which are 16 bit.
The recording sampling rate varies according to the selected DDC bandwidth,
shown in the following table:
DDC Bandwidth
(kHz)
DDC Recording
Sampling Rate (kHz)
20 25
24 32
32 40
40 50
50 62.5
64 80
80 100
100 125
125 160
160 200
200 250
250 312.5
320 400
400 500
500 625
640 800
800 1000
1000 1250
1250 1666.67
1600 2000