Re: LF: EA in LF soon

[DAVE PICK <daveyxm@virginmedia.com>]

Luis

Good job!

But if the top coil is wound the wrong way it will be subracting from the main coil.

Move it away from it, maybe stand it on something else a metre away, this will reduce the mutual coupling and increase the total inductance.

If it had been would the same way, as Stefan said, moving it closer would increase the inductance - but as it is the wrong way it decreases!

73

Dave G3YXM

On 11 April 2016 at 10:05 VIGILANT Luis Fernández <luis@vigilant.es> wrote:

Hi LF

 

My progress to get access to LF:

 

Added a coil on top of the 300mm pipe. With this in series can reach resonance at 270KHz

https://dl.dropboxusercontent.com/u/7162072/Fotos%20varias/MF/IMG_20160409_183709.jpg

https://dl.dropboxusercontent.com/u/7162072/Fotos%20varias/MF/sark_029.bmp

 

Then added another coil. Two layers winding, reaching 152KHz

https://dl.dropboxusercontent.com/u/7162072/Fotos%20varias/MF/IMG_20160411_093327.jpg

https://dl.dropboxusercontent.com/u/7162072/Fotos%20varias/MF/sark_031.bmp

 

I'm afraid I winded "the wrong way" to get it working as yougurt cup over the top coil. Will try to

reverse it. Anyway a convenient fixing (not the one shown in picture) can be made keeping one over the other

 

Next is to play with top load capacitive wires to increase capacity and get it down to 137KHz

 

.....keep tuned ! ;-)

 

73 de Luis

EA5DOM