Home |
Search |
Today's Posts |
#5
![]() |
|||
|
|||
![]()
Chuck wrote:
I've been looking through your Ver. 3 manual and I cannot find any reference to non- radiating networks: two-port network specification (NT)) or the thin-wire option: the Extended Thin-Wire Kernel (EK). Nor do I see these functions in your control panel. The extended thin wire kernel is invoked automatically when the model is such that it's needed, according to the criteria given in the NEC manual. Two port networks are used by EZNEC only to create current sources and transmission lines. In looking through the NEC2d docs, my concern regarding NEC's ability to 'see' "induced current at one or more points in a structure" has been put to rest. However, in Section V of the NEC2d docs (p 62), quite a lot of attention is given to (1) source modeling and (2) nonradiating networks. . . . I'm glad you've finally looked in the manual to correct your misconceptions about the NEC transmission line model. All EZNEC seems to offer ITR, are simple transmission line simulations where the fed (source) energy is applied to a segement (load). In the Transmission Lines window, the user specifies which wires the two ends of the transmission line are connected to. There's no requirement that one be a "source" or one a "load". These use the NEC network model, as does NEC. Figure 20 (p 69) and Figure 21 (p 70) and the related discussion, make clear that NEC can model parallel elements coupled through a 2-port network (simulated bi- directional transmission line). Since your control center appears to not utilize 2-port networks, it is no wonder your software fails to agree in some instances with empirical data. Huh? I'm always interested in hearing of any case where EZNEC disagrees significantly with NEC-2 for any model, and I'm not aware of any such cases. Anyone seeing such disagreement is encouraged to contact me. Please include both the NEC and EZNEC models. You are, however, obligated to provide ALL of the NEC capabilities in your software! No, Chuck, I'm not obligated to do anything you say. Anyone not satisfied with the capabilities of EZNEC is encouraged to not purchase it. I guarantee that anyone who does purchase it will be satisfied. If, in your closed-minded ignorance, you wish to call critical coupling a "pseudo-scientific" theory, so be it. But in doing so, you leave me wondering if, perhaps, some concepts simply lay beyond your ability to visualize. Indeed. I also have trouble with Chi, the healing power of crystals, astrology, homeopathy, reflexology, phrenology, and water witching. Believers in those things say exactly the same thing about me, so surely you must be right. Guilty as charged. Roy Lewallen, W7EL |