The HAP chart is a guide to frequency selection for HF communications between mobiles and a specified base station, in this case Johore Malaysia which also can be refer as a whole of Malaysia. The recommended frequency for communications with the base at a given hour is read off from the point in the map corresponding to the mobile's location.The predictions are made from real time data which are updated each hour. 'dash lines' - If present, these delineate areas of unlikely communication. Poor communication areas which can result from one or more of the following conditions:- the Absorption Limiting Frequency (ALF) is higher than the Optimum Working Frequency (OWF).- the ALF exceeds the highest frequency in the user's frequency set. - there is no suitable frequency from the user's set that is between the OWF and ALF
Monday, August 18, 2008
HF Hourly Area Perdiction Chart
The HAP chart is a guide to frequency selection for HF communications between mobiles and a specified base station, in this case Johore Malaysia which also can be refer as a whole of Malaysia. The recommended frequency for communications with the base at a given hour is read off from the point in the map corresponding to the mobile's location.The predictions are made from real time data which are updated each hour. 'dash lines' - If present, these delineate areas of unlikely communication. Poor communication areas which can result from one or more of the following conditions:- the Absorption Limiting Frequency (ALF) is higher than the Optimum Working Frequency (OWF).- the ALF exceeds the highest frequency in the user's frequency set. - there is no suitable frequency from the user's set that is between the OWF and ALF
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