from my experiences with DXing on Topband I found that there are some frequencies which are not usable in some DX locations cause of local heavy QRM over there or permanent local BC interfered signals or other problems.
These frequencies are permanently unusable or even forbidden for DXing in that DX location and its not efficient to calling CQ or looking for DX from that location overe there...
In my oppinion it will be very usefull for all Topband enthusiasts to have the table of that "forbidden QRGs" available for quick check if needed. This table will be updated as many time as possible.
|QRG (kHz)||Forbidden range (kHz)||DX-location||Comments|
|1820||1819 - 1823||JA||permanent BC QRM in JA around 1820|
|1818||1815 - 1821||ZL||strong QRM from local GPS correction on 1818|
Informations about another "forbidden QRGs" in Your locations are welcommed for sure!
73, Petr OK1RP