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
92
The Notch and Audio filter lengths can also be adjusted using this facility,
resulting in sharper (or shallower) notch and audio filtering, tailored to specific
customer requirements.
Should the computer become sluggish or even “freeze” as a result of this
adjustment, please reduce the respective filter length to a lower value.
Note also that the CPU load can be lowered (while keeping selectivity high) by
reducing the DDC1 bandwidth. For example standard HF and narrow-band FM
signals can be demodulated with 20 kHz DDC1 bandwidth without decrease in
demodulation quality. Wider DDC bandwidths affect display and recording,
while increasing the CPU load considerably.
Front Panel LED
This function is only applicable to the WR-G39DDCe (USB interfaced) model.
Normally, its front panel blue LED flashes with various different patterns which
are useful for installing the receiver and debugging possible interface problems
(see Appendix C).
However, as the flashing LED may be disturbing, the behavior of this LED in
its normal "receiver ready" state can be controlled by the user, making it
possible to keep the LED continuously on or off, to suit the user's preference: