RADIXON WR-G35DDC EXCALIBUR ULTRA, User Manual

Page: 121 / 128

WiNRADiO G35DDC User’s Manual
121
DDC Bandwidth
(kHz)
DDC Recording
Sampling Rate (kHz)
2000 2500
2500 3333.3
3200 4000
4000 5000
5000 6250
6400 8333
8000 10000
10000 12500
12500 16667
16000 20000
20000 25000
25000 33333
32000 40000
(Note: The Nyquist theorem is satisfied because there are two values (I
and Q) for each sample (stored as two stereo channels), so the effective
sampling rate is twice of that shown.)
The Audio recorder can record standard Windows “ .wav ” files with 16 bit
word length, sampled at 32 kHz, in mono, or in WINRADiO proprietary WWV
(extension “ .wwv ”) file format, which also stores the actual time, frequency,
mode and the RMS signal strength. These additional data can be viewed in
special WWV players, such as the WiNRADiO
WAARP .
The following standard naming conventions apply to files created by the DDC
and audio recorders:
If the Insert FDT button is pressed, a file with a name such as
rec-12.345678MHz_11-07-04_15’34’57.ddc is created. The center frequency
of the DDC spectrum, together with the current local time, are saved as a part
of the file name, to be able to position the spectrum accurately during
playback. With audio recordings, the actual tuned frequency and the local time
are inserted. (This information serves merely for the user’s convenience, i.e.
the receiver is not tuned to this frequency when such file is played back.)
If you select Increment for the If file exists condition and start recording, this
will create a file named for example rec-12.345678MHz-$001.ddc . The file
name includes a “counter” prefixed by the “ $ ” sign. With each new created file,
this counter will be incremented.