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
45
Tuning Tab
The Tuning tab contains controls for Passband tuning, BW presets,
demodulator spectrum Centering, AFC (Automatic Frequency Control),
TTP (Tune to Peak) and Stepping controls. For the AMS, ISB and DSB
modes, it also contains lower or upper sideband selection, and for the UDM
mode there is also a mode selection.
Passband tuning
The passband tuning control duplicates the function of dragging the
demodulator passband using the right mouse button. These two methods are
interchangeable. The advantage of this control is that the actual tuning offset is
visible and can be precisely adjusted.
Passband tuning makes it possible to finely adjust the demodulator filter
position in the AMS, LSB, USB and CW modes without a whistle effect due to
a misaligned BFO, making it possible to avoid interference and finely tune the
receiver for optimum reception.
Pressing the Reset button sets the passband tuning offset to zero.
Demodulator Bandwidth Presets
The Demodulator filter bandwidth (which represents the overall selectivity of
the receiver) can be set in two ways: The quickest way is to use the preset
values represented by the row of 15 buttons at the bottom of the Tuning tab: