Hi Albert and Gary,
Yes, here it is the same. The detuning due to wet soil is higher than on
LF. Also the relative rise of the resistive losses are higher than on
LF. It can make up to 3 dB here.
Now i think about a switch that allows to switch from LF to MF remotely.
The idea is that the LF coil remains connected to the antenna (i.e. is
not switched), only the MF coil would be switched in parallel. There
will be some reactive current through the LF coil when operating on MF
but it can be compensated and the losses will be low. I still did no
calculations. At least the MF voltages and currents are quite low
compared to LF...
73, Stefan/DK7FC
Am 13.01.2013 11:28, schrieb Albert W:
Hello Stefan es Gary,
The same here depending on weather conditions and of course frequency
change, using a relative small variometer (DC-motor adjustable from
the shack) in series with the fixed L.
73, Albert PA0A
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