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
96
While the buffering removes drop-outs, on the other hand it introduces a
certain delay (latency) to the output audio.
The Min. buffer size and Max. buffer size parameters can be adjusted to
minimize the latency for a particular computer system.
The Min. buffer size parameter can be adjusted to the minimum acceptable
value before significant distortion or drop-outs develop. On the other hand, the
Max. buffer size parameter determines the maximum allowable latency.
AMS Capture Range
In the AMS mode, there is a certain "capture range", a frequency range within
which the receiver will capture the signal and lock to synchronization. If you
are tuning to a new signal, this Tune capture range is initially quite wide,
within ±1.5 kHz (factory default value) from the actual signal frequency, to
enable easy tuning by pointing and clicking near the peak in the DDC
spectrum, or dragging the filter passband area in the demodulator spectrum.
You can adjust the Tune capture range to a different width for tuning
convenience.