Using the LD(load) command to implement a parallel LC network should you set the resistance value very large or zero?
This answer was provided by Dr. James Breakall, Penn State University. The inputs on the LD command are ignored if you put zero in for the values. The parser in NEC knows to look for zero inputs as a sign that there is no element of that type. For instance if you put an LD series with 50 ohms and zero for L and the C and did the same for parallel, they would both give you the same result. You can see what the element is by looking in the NEC output listing. In the listing you will see nothing listed for the R or C or L type of element if a zero was input for the value, respectively. If you wanted a short for one of the values (really doesn’t make much sense), you would input something like 1E-10 or 1E-3 for the resistor. If you wanted an open or high value for the R, then you would enter something like 1E10 or 1E6.
