Re: LF: Results of optimising an active antenna

["Roelof Bakker" <roelof@ndb.demon.nl>]

Hello Stefan,

Thank you for your detailed description.
I have carried out the same tests some five years ago and arrived also at  
a length of 30 cm.
The wire can be replaced by a 30 x 40 mm piece of copper clad PCB for the  
same results.
Using SMD parts, which have less capacitive coupling due to the small  
size, a further size reduction is possible.
Your findings that raising the antenna higher than 4 m is correct as the  
signal to noise ratio will not improve, so nothing will be gained.  
However, this depends on the surroundings. At the border of a lake, I  
found an height of 2 m sufficient for weak signal work at LF.
Best regards,
Roelof Bakker, pa0rdt