Chapter 4 181
Downloading and Using Files
Downloading FIR Filter Coefficients
Selecting a Downloaded User FIR Filter as the Active Filter
Using FIR Filter Data for Custom Modulation
Use the following steps to select user FIR filter data as the active filter for a custom modulation format.
Via the front panel:
1. Press
Mode > Custom > desired format > Filter > Select > User FIR
2. Highlight and select the desired file in the catalog of FIR files.
3. Turn on the selected format.
4. Modulate and activate the carrier:
a. Set the carrier frequency.
b. Set the carrier amplitude.
c. Turn on modulation.
d. Turn on the RF output.
Via the remote interface:
[:SOURce]:RADio:<desired format>:FILTer "<file_name>"
[:SOURce]:RADio:CUSTom[:STATe] On
Troubleshooting FIR Filter Coefficient File Download Problems
NOTE Review “Data Requirements and Limitations” on page 179.
Symptom Possible Cause
ERROR -321,
Out of memory
There is not enough memory available for the FIR coefficient file being downloaded.
Either reduce the FIR file size, or delete unnecessary files from memory.
ERROR -223,
Too much data
User FIR filter has too many symbols.
Real Time cannot use a filter with more than 64 symbols (512 symbols maximum for
ARB). You may have specified an incorrect oversample ratio in the filter table editor.
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