EMI-RFI and Noise related HF Radio Station performance loss HF radio performance loss due to EMI-RFI and noise in and around the station environment is often a major issue that could almost cripple the communication capability. This is especially true during conditions of low SSN, the way it prevails during the ebbing part of the Solar Cycle. Many amateur radio operators do not realize the real consequences and the utter magnitude of loss in their radio station’s performance. More often than not, we have heard statements like – The HF bands are now dead at low SSN, the only viable way is to wo ..read more

Multiband End-Fed Half-Wave EFHW Antenna The End Fed Half Wave antenna or the popularly known EFHW antenna has been around almost ever since the inception of HF radio. Nevertheless, the EFHW antenna had in the past, been rather sparingly used by amateur radio operators due to various reasons. Although it is simple to build and is a multiband antenna, it has several attributes that make its overall performance far less than optimum for any serious HF DX operator’s liking. However, in the present day and age, thanks to many commercially manufactured EFHW antenna available in the market, more and ..read more

Antenna Bearings – Geodesic Map We present automatically rendered Antenna Bearings with Geodesic Paths projected on a Rectangular Map. Each geodesic great circle path displayed on the map originates from your location that is derived from your Internet IP address. Therefore the Antenna Bearing Geodesic Map generated below should be accurate and relevant to your physical location (QTH). This map is an alternative to the Great circle Map presented on another page of this website and hence provides an alternative perspective. However, beware that if you are using a VPN to access this website, the ..read more