| Write/Read | About IM Spectrum | 
| Description | Sets and returns the receiver Start frequency for the IM Spectrum measurement. Valid ONLY when Tracking is NOT enabled and when Sweep Type = Linear. Otherwise, this setting is ignored. | 
| VB Syntax | ims.SpectrumStartFrequency = value | 
| Variable | (Type) - Description | 
| ims | An IMSpectrum Object | 
| value | (Double) Start frequency in Hz. Choose a frequency within the range of the VNA. | 
| Return Type | Double | 
| Default | 950 MHz | 
| Examples | ims.SpectrumStartFrequency = 10e9 'Write | 
| value = ims.SpectrumStartFrequency 'Read | |
| C++ Syntax | HRESULT get_SpectrumStartFrequency(double *pVal) | 
| Interface | IIMSpectrum |