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
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2. If the AGC is enabled and the sound is distorted despite the volume being
turned down, make sure that the AGC reference level is not set too high. If the
volume is too low, try to increase the AGC reference level.
3. If the AGC is disabled and the sound is too weak despite the volume control
being all the way up, try to increase the manual gain.
4. In LSB, USB, ISB, DSB and CW modes, manual gain is often preferable to
automatic gain because there is no “carrier” the AGC would act upon and
maintain at a constant level. If AGC is used, then the slow setting is
preferable.
Noise Blanker
The Noise Blanker can be used for removal of random high-level noise-spikes
resulting from atmospheric effects and man-made interference.
There are two types of noise blankers available, one using the Short Time
DDC Averaging method and another one using the ADC Input Threshold
method.
The Short Time DDC Averaging method is based on comparing the
instantaneous signal level at the DDC output (demodulator input) to a short-
time exponential average. If the instantaneous level exceeds the short-time
average, these samples will be replaced with zeros.
With the ADC Input Threshold method, the blanking effect occurs much
earlier in the signal processing chain: The signal samples arriving from the
ADC are compared to a threshold value, and, if greater, then these samples
are zeroed.