[Lowfer] Ferrite Loading Coil ?

[k2ors at comcast.net]

Peter,

  DK5PT used a pot core ferrite loading coil for transmitting and varied 
the air gap of the core to fine-tune the inductance:

http://www.wireless.org.uk/dk5pt-f.htm

  However, verticals are rarely the best receiving antennas due to their very susceptibility to noise.
--
73 Warren K2ORS
WD2XGJ     136-140kHz
WD2XSH/23 505-510kHz
WE2XEB/2   160-189kHz
WE2XGR/1 505-515kHz

FN42hi
http://www.w4dex.com/wd2xgj.htm