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
63
threshold somewhere between these extreme values. Note that the noise
squelch is particularly effective in the FM mode and its values also depend on
the demodulator bandwidth setting.
The adjustment procedure for the voice squelch is similar: Tune to an
unoccupied channel first, then to an active voice channel, note the
corresponding Voice content values, and set the voice threshold between
these two extremes.
To enable the squelch action, click the Enable button. Clicking it again
disables it.
It is easy to forget that squelch is active. If the receiver doesn’t seem to
be operational (no sound from the speaker), check the squelch and mute
settings first.
Gain
The Gain tab contains several controls to adjust various gain-related settings
of the receiver. The gain is a software parameter, and can be set separately
for each of the two virtual receivers.
AGC
The Automatic Gain Control (AGC) acts upon the digitally down-converted
and filtered demodulator passband, in order to keep the signal coming to the
demodulator at a constant level.
This is in fact functionally similar to AGC typically implemented in conventional
receivers, which also works on the IF signal prior to demodulation. The
difference is that in a conventional receiver this is implemented in hardware,
while in the Excelsior it is a software function.