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
116
Problem Solution
I can hear the
audio and tune the
receiver, but the
audio is very
noisy.
Make sure the Attenuator is disabled (on HF bands)
and the Preamplifier is engaged (on VHF/UHF/SHF
bands). Check that your antenna is properly
connected, the connector is not loose and that the
antenna cable is not damaged. Does the noise floor
drop significantly if you disconnect the antenna? If so,
then perhaps the antenna is picking up too much
ambient noise. Try to improve the antenna, or move it
further away from the PC. An outdoor antenna is
preferable. Watch for ground loop problems (for
details, see the chapter Connecting the Antenna).
Reception is
obscured with a
buzzing
interference or
periodic RF peaks.
Check for the sources of interference in your
surroundings: it could be fluorescent lights, a lamp
dimmer, or other household appliances. Your PC
could be the culprit. Unless you are able to suppress
the interference at the source, the only solution is to
install a better antenna, preferably an outdoor one.
Computer networks are especially noisy and if your
PC is connected to one, you will almost certainly need
an outdoor antenna. If the interference level varies
periodically with peaks about 30-100 kHz apart, the
most likely culprit is the monitor or the video card.
Modern LCD monitors generate much lower levels of
interference than old CRT ones. A noisy laptop may
also create “comb-like” spectra with peaks several
MHz apart. Switch the monitor off - if the interference
disappears then the cause is the monitor. Move the
antenna away from the computer and observe if the
interference reduces as a result. (See also Appendix
D – Dealing With Interference.)