Simple QRP projects, 10m, 8m, 6m, 4m, FT8, 160m, WSPR, LF/MF, sub-9kHz, nanowaves and other random stuff, some not related to amateur radio.
22 Mar 2014
Longer low Marconi - not too good on 474.2kHz
Overnight with my 5mW ERP on 474.2kHz reached 3 Dutch stations, 1 Belgian and one English. This is a low number so I conclude the longer low Marconi is NOT a good antenna configuration for 474.2kHz.
It is the length of the vertical portion of the Marconi that is determining the ERP. The horizontal top wire is only providing additional capacitance. My Marconi-T is 8 meters high and has 20 meters horizontal wire. It is about 25 dB down compared to a full-size quarterwave vertical.
Good to see you reached the other side of the North Sea :-) 73 Ron pa2rf
ReplyDeleteIt should have done better Ron, I suspect the top wire is too close to plants with rising sap.
ReplyDeleteHi Roger,
ReplyDeleteIt is the length of the vertical portion of the Marconi that is determining the ERP. The horizontal top wire is only providing additional capacitance. My Marconi-T is 8 meters high and has 20 meters horizontal wire. It is about 25 dB down compared to a full-size quarterwave vertical.
73, Robert
Agreed Robert. I need a bigger (taller) Marconi to get the best from
ReplyDeletemy MF/LF work.