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
46
The numbers on the buttons represent the bandwidth in kHz. These preset
bandwidths change depending on the selected mode, offering an optimum
choice of typical values applicable to that mode.
To change the demodulator bandwidth continuously, you can use the
DEM BW control located above the demodulator spectrum scope:
There are two ways you can use this control: Either click on the box and
highlight all digits, then type the bandwidth directly into the edit box (you can
terminate the entry with h for Hz or k for kHz, or select the required bandwidth
value using the drop-down list).
Another very convenient method of adjusting the demodulator filter bandwidth
is a graphical one, by dragging the edges of the shaded area representing the
filter passband in the demodulator spectrum:
Continuous adjustment of the demodulator filter bandwidth makes it possible
to adjust the bandwidth to exactly fit the actual spectrum of the received signal,
to obtain the best signal-to-noise ratio and minimize interference from adjacent
channels.
For USB/LSB modes, dragging one edge of the shaded area adjusts the
tuning position, dragging the other adjusts the filter bandwidth. The “tuning
edge” is highlighted for easy orientation. The same applies to AMS, ISB and
DSB modes if only one sideband is selected.