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
98
It is also possible to channel the audio output to an ASIO (Audio Stream
Input/Output) device, if it is available in your system. This feature makes it
possible for an ASIO device to bypass the Windows audio processing layers
and access the receiver’s audio output directly, with the lowest possible
latency and eliminating any artifacts introduced by the computer’s operating
system.
Show Measurements
The Test and Measurement functions of the Excelsior receiver make it
possible to indicate the ADC input level (in percentage of the entire ADC
range), Frequency error of the received signal (assuming the receiver is
tuned to the correct frequency), AM modulation depth (for AM-modulated
signals), Frequency deviation (for FM-modulated signals), SINAD (signal-
plus-noise-plus-distortion to noise-plus-distortion ratio) and THD (total
harmonic distortion):
For SINAD and THD, the test frequency is assumed to be 1 kHz.
Note that this function is also conveniently duplicated by the information
button
in the DDC2 spectrum scope “toolbox”.
Show Data Rates
The Show Data Rates display shows the various internal data rates of the
entire G39DDC receiver system. This may be useful especially for debugging
of installation problems: