TM
FlexRadio Systems 2003 Page 6
clock jitter. All of these limit the effective dynamic range of the SDR-1000. Just
because a board is called a 16-bit board does not mean that it has 16 usable bits of
dynamic range. Some cards may only have 12-14 usable bits. A true 16-bit card will
have 96dB of dynamic range. You will loose 6dB of dynamic range for each bit that is
not usable.
Probable Causes:
1. If you just installed the RFE board, read the section above titled, “RFE Just
Installed - Now Signals Weak and Transmit Power Low.”
2. The sound card does not have sufficient dynamic range to support the SDR-1000.
Refer to the officially supported sound cards that are named in the
SDRConsole Installation and Quick Start Guide and on the Specifications
page of the FlexRadio Systems website.
3. Some mixers have special effects (reverb, etc.) that can significantly reduce the
dynamic range of the sound card. Make sure all effects are muted or turned off.
You want the sound card to have a completely flat input response for best
performance.
Tuning is Off Frequency
Operational Description: A 200MHz low jitter oscillator clocks the AD9854 DDS.
Frequency compensation is provided in the SDR-Console software to correct for
oscillator offset. A description of the procedure for offset compensation is covered
under the topic of Clock Oscillator Adjustment in the SDRConsole Installation and Quick
Start Guide.
Runtime Error 13 “Type Mismatch”
Operational Description: International customers may experience this error message
when loading SDR-Console with the Windows operating system set for the local
language. This is because the SDR-Console uses the English fractional (decimal)
delimiter “.” for display and storage of frequency. Some countries use “,” or other
symbols as fractional delimiters.
The current solution is to switch the OS to English using the Regional and Language
Options from the Windows Control Panel when running the SDR-Console. Windows
makes it fairly easy to switch back and forth between languages by placing the switch on
the task bar after you use it the first time.
If for some reason you open and close the SDR-Console in a language that does not have
the “.” delimiter, you will cause a very large frequency to be stored in the Windows
registry. This will cause the type mismatch error when you start SDR-Console. The only
solution is to delete the SDRConsole registry using regedit.exe. You will find the
SDRConsole folder under HKEY_CURRENT_USER\Software\VB and VBA Program
Settings\SDRConsole. Simply delete the folder, switch to English, and reload
SDRConsole. The defaults will then be restored.
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