4nec2 is a completely free Nec2, Nec4 and windows based tool for creating, viewing, optimizing and checking 2D and 3D style antenna geometry structures and generate, display and/or compare near/far-field radiation patterns for both the starting and experienced antenna modeler. When running frequency sweeps, linear or logarithmic style SWR, Gain, […]
Daily Archives: June 4, 2012
3 posts
Reject unwanted MW AM signals from your RX Front End A nearby broadcast AM station in the Medium Wave band can sometimes cause interference to HF receivers over a broad range of frequencies. A band-stop filter can reject the unwanted frequencies and keep them out of your receiver. This design […]
The KD9SV Front End Saver in a new fashion. If you use a separate receive antenna, you need a Front End Saver to eliminate the possibility of blowing out your receiver’s front end while using an auxiliary receive antenna. Unfortunately, all the radios produced by Icom, Kenwood, Yaesu & TenTec […]