User's Manual
Table Of Contents
- Table of Contents
- Introduction
- The Hardware
- Installation
- Getting Started
- Inside the Excelsior
- Resizing the Application Window
- Drop-Down Menu Controls
- Tuning the Excelsior
- Receiver Selection
- Mode Selection
- Function Tabs
- Spectrum Scopes
- Recording Functions
- Attenuator
- Preamplifier
- S-meter
- Top Menu Bar
- File
- Options
- Auto-mute RX not in focus
- Enable second RX
- Filter Length
- Front Panel LED
- Display Offset
- Time
- Keyboard Shortcuts
- VSC Set-up
- Audio Buffering
- AMS Capture Range
- Audio Output
- Show Measurements
- Show Data Rates
- Of particular interest to many users will be the CPU load (excessive CPU load may cause sluggish behaviour or freezing of the computer), and Audio latency. Apart from DDC bandwidth, CPU load may be minimized by reducing the Demodulator filter length (...
- Note: When measuring sensitivity using SINAD, it is very important that the Audio Filter is enabled and the cut-off frequencies (and for FM measurements, also the de-emphasis) are set according to the specified test conditions. Proper audio filtering ...
- Show Waterfall Timestamps
- Calibration
- Hand-Off Receiver
- Color scheme
- Restore factory defaults
- Memory
- Scheduler
- Scanner
- Logger
- Plugins
- Power Switch
- Date and Time Display
- Appendix A – SDR and DDC Primer
- Appendix B – Troubleshooting
- Appendix C – USB Interface Diagnostics
- Appendix D – Dealing with Interference
- Appendix E – G39DDCi PCIe Card Connections
- Appendix F – Waterfall Spectrum Palettes
- Appendix G – Recording File Formats
- Appendix H – Compliance Declarations
- Appendix I – Safety Disposal
WiNRADiO G39DDC User’s Guide
123
DDC Bandwidth
(kHz)
DDC Recording
Sampling Rate (kHz)
2000
2500
2500
3333.3
3200
4000
4000
5000
Note: The Nyquist sampling 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, 48, 64, 96 or 128 kHz (according to the ASR –
Audio Sampling Rate setting), 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 Frequency and Date/Time checkbox is checked in the recorder
“toolbox” 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 its name 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.
If you engage the Split button and the file size reaches 2 GB, the existing file
will be automatically closed and named rec-12.345678MHz-$001-^001.ddc,
where the “^” sign denotes these split sections, and recording will
automatically continue into a file named rec-12.345678MHz-$001-^002.ddc. If
you manually stop and restart the recording, it will continue to a file named
rec-12.345678MHz-$002.ddc, etc.