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
91
Enable second RX
By default, the second receiver is enabled. If disabled, then only the RX1 tab
remains active and it will not be possible to activate the RX2 tab. This feature
is useful with computers of insufficient processing power to run both receivers
with satisfactory DDC bandwidth and filter selectivity. By deactivating RX2, the
CPU load will be reduced and this additional power will become available for
RX1 which will then be able to achieve a wider DDC bandwidth and/or greater
selectivity.
Filter Length
This facility makes it possible to adjust the digital filter “length” (which directly
translates into selectivity) for three types of filters used in the Excelsior:
The Demodulator filter length has a direct influence upon the overall
receiver selectivity. Greater length gives better selectivity.
The maximum achievable selectivity is limited by the processing power of your
computer: The greater the CPU power, the “longer” (and therefore sharper)
can the filter be made.
This function also makes it possible to observe the CPU load, which will
depend on this setting. It may not be advisable to select a value resulting in
more than say 30% CPU load, as the computer may then become sluggish.