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
26
The dark blue rectangular area inside DDC1 spectrum corresponds to the
DDC2 bandwidth, while the grey area inside both the DDC1 and DDC2
spectrum relates to the demodulator filter bandwidth. This bandwidth
represents the selectivity bandwidth of the entire receiver and, for the best
signal-to-noise ratio of the received signal, you might wish to adjust this
bandwidth to very closely embrace the visible spectrum of the received signal.
You can do this either using the DEM BW control, or by dragging the edges of
the grey area in the DDC2 spectrum.
You can also drag these areas sideways, by clicking and dragging at their
centre or anywhere inside them, in both the DDC1 and DDC2 spectrum. This
is equivalent to the IF Shift function in conventional receivers.
Clicking on any of the spectrum scopes will cause the receiver to tune to the
corresponding frequency. But as the WiNRADiO Excelsior consists of two
receivers in one, this does have some ramifications which will be further
explained in the following chapters.
If you are a newcomer to software-defined receivers and need a little more
detailed background information on software-defined receivers and digital
down-conversion, please read our SDR and DDC Primer in Appendix A.