**Do I need a key for AN-SOF Trial version?**

No. Just run AN-SOF and begin using it.

**Is there a time limit for the Trial version?**

No. There is just a limit of 100 unknowns (segments or connections).

**Will AN-SOF stop working when my subscription ends?**

No. There is no time limit on any of the plans. All licenses are perpetual.

**What happens if I don't renew my subscription?**

AN-SOF will continue to work but you will not be able to download updates.

**Can I import NEC files into AN-SOF?**

Yes. Most of the NEC cards are supported. Download NEC example files to import into AN-SOF from here>.

**Is AN-SOF based on a NEC engine?**

No. AN-SOF is an independent implementation of the Method of Moments (MoM) for wire structures. NEC is an old Fortran calculation engine that has several limitations. Many of these limitations have been removed in AN-SOF by implementing a completely new object oriented C++ code. See further details **here>.**

**What are the minimum PC requirements?**

Windows Vista/7/8/10. 2GHz CPU, 2GB RAM, 1GB free disk space.

**I get the error MCLMCRRT71.DLL was not found.**

In the link from where you have downloaded AN-SOF you will find a Math Package. After installing this package the error will be fixed. Math Package here>

**What is the upper frequency limit?**

There is no theoretical upper limit for the frequency since the structure size is **measured in wavelengths**. So we talk about a size limit in wavelengths instead of a frequency limit. The simulation requires solving a matrix equation of increasing order as the structure size is increased in wavelengths, so modeling large structures will require more computer memory and time on a particular PC.

**Does AN-SOF support parallel procesing?**

No, it does'nt. AN-SOF has been developed to run on home computers running Windows(R) OS, so numerical calculation strategies have been implemented to take care of the available RAM memory and at the same time obtain reliable results.

**Does AN-SOF support load impedances?**

Yes, it does. Resistance, inductance and capacitance elements can be added to the structure to model the connection of lumped load impedances.

**Are near E- and H-fields available in tables and for exportation as excel files?**

Yes, they are. The computed near E and H fields can be visualized in 2D and 3D plots as well as in tables and exported as CSV files. Cartesian, cylindrical and spherical near field components can be obtained.

**Is the thin-wire grid model well suited for surfaces?**

Although the Method of Moments (MoM) is specialized to thin wire structures in AN-SOF, metallic surfaces can also be modeled by means of equivalent wire-grids with reasonable accuracy. As a general rule, the wire radius must be 1/4 of the separation between the wires in a grid. You will find a paper about equivalent wire-grid modeling here>.