Re: LF: Results of optimising an active antenna

[Alberto di Bene <dibene@usa.net>]

Roelof Bakker wrote:
> Hello Alberto,
>
> I have used a large coffee tin (30 cm high and 27 cm diameter), for a  
> passive electric field probe.
> The capacitance was way to high for active circuitry. Instead a rf  
> transformer wound on a hefty high mu toroid was used to couple the antenna  
> to the coaxial feedline. It worked, though the bandwidth was restricted to  
> LF and MF.
> An other example is using a small diecast alluminium box (50 x 50 x 30 mm)  
> with the buffer amplifier mounted inside.
Hello Roelof,

  thanks for the info. Well, 30 x 27 cm was rather a big coffee tin...
Who knows, may be a small beer can, those of 33cl, has the right capacity
towards ground... must do an experiment. Suggestions about the brand of the
beer are gladly accepted... :-)

73  Alberto  I2PHD