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
97
Once locked to a signal, the capture range automatically reduces to ± 50 Hz
(factory default value) from the signal frequency. The reason for such
reduction is to avoid "kidnapping" of the synchronization frequency by a
nearby strong signal if the carrier signal fades, as may happen especially with
long-distance reception due to ionospheric effects.
You can adjust the Sync. lock range as a compromise value – if it is too
small, then you may lose sync in case the transmitter frequency drifts (modern
day transmitters have much better frequency stability than those of
yesteryear). On the other hand, if the Sync. lock range is too wide, then there
is an increased possibility of losing sync due to a nearby strong signal.
When the signal is locked in synchronization, this is indicated using a "lock"
symbol located in the top left corner of the frequency display
Audio Output
The audio output function makes it possible to allocate the audio output of the
receiver to different Wave out audio devices available on your computer. This
may be handy in special applications where you might wish to use one
receiver for audio output only, another one for data decoding (via a virtual
sound card), etc.