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
72
Note that the best achievable accuracy of the various point-and-click
operations inside the displayed spectra will be limited by the width of the
displayed spectrum (remember that the width of any of the spectrum
scope windows is adjustable and can be extended over two or more
monitors) and the respective RBW limit of the particular spectrum scope,
which is dependent on the currently selected DDC bandwidth.
Spectrum Averaging
The AVG control employs time averaging to smooth the spectrum trace. The
trace is averaged over the selected time period, variable from 0 to 2 seconds.
This makes the viewing of the spectrum easier on the eyes, reducing the noise
floor fluctuations while leaving the useful signal clean and steady.
The
and buttons make it possible to reveal minimum and maximum
signal values (respectively) received during the averaging period. These
buttons are enabled only if the averaging period is non-zero.
Waterfall Spectrum
The DDC and wideband spectrum scopes are both equipped with the
Waterfall function. Clicking on the Waterfall button transforms the standard
spectrum scope into a waterfall-type one, where the vertical-axis represents
time and signal strength is represented by a palette of colors: