IMPORTANT - Because of SysCalc's new features, several changes must be considered when reading older SysCalc projects:
Projects converted to the new SysCalc6 format cannot be read by previous versions. If you must preserve older projects, do not convert them; rather copy the older projects to the SysCalc6 Projects folder and convert those files instead.
Previous to SysCalc5, system bandwidth was a global parameter that was set in the Project Properties dialog; all components had infinite bandwidth. Starting with SysCalc5 components are frequency dependent; the system bandwidth is determined from the components themselves rather than from a global bandwidth parameter. To simulate the global bandwidth specified in previous projects, a band-limited probe having the same bandwidth is appended to the end of the cascaded chain (See Probe Settings). This ensures that the system performance between the older and newer projects is identical.
Previous projects (SysCalc4 and earlier) do not contain sufficient information to utilize the new filter and mixer capabilities. Since there is no way to convert filter and mixer components in older projects to the newer format, they are left as "simple" models (see Bandwidth Considerations, Filter and Mixer Specifications). To properly make use of SysCalc's new features, you will want to specify appropriate parameters for each filter and mixer. For filters, this will include filter family, filter type, frequency, bandwidth, etc. For mixer, you can specify conversion type (up/down converter), fixed/tunable, RF/IF frequencies, SSB noise, spurious suppression, etc.