RE: LF: EA5DOM going vertical

[VIGILANT Luis Fernández <luis@vigilant.es>]

Hi Stefan

 

This is a picture of the coil

25cm diameter pipe, 90 cm high

 

https://dl.dropboxusercontent.com/u/7162072/Fotos%20varias/MF/CAM00571.jpg

 

I can also fit this variometer on the top side of the pipe

 

https://dl.dropboxusercontent.com/u/7162072/Fotos%20varias/MF/CAM00559.jpg

https://dl.dropboxusercontent.com/u/7162072/Fotos%20varias/MF/CAM00558.jpg

 

The -3dB of my signals yesterday are probably due to QRN on the Rx. We had a big storm down in south EA

 

Another one is predicted for tomorrow just here and strong rain. No good for installing the coil

 

73 de Luis

EA5DOM

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De: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] En nombre de DK7FC
Enviado el: domingo, 18 de octubre de 2015 23:20
Para: rsgb_lf_group@blacksheep.org
Asunto: Re: LF: EA5DOM going vertical

Hi Luis,

Am 18.10.2015 21:59, schrieb VIGILANT Luis Fernández:

For the transformer I plan to recycle the one osed for the loop. It has two big toroids 80mm external diameter

and 8mm thick. Both joined make 16mm thick. Unfortunately don't know which is the material used

Hm, sounds not optimal, somehow :-) But just start with a 1:1 transformer and a 50 Ohm dummy load as a first test. If the transformer stays cold and the load (e.g. power consumption, or current meter reading of the power supply) is the same with or without the transformer, everything is fine.

Can be primary and secondary be wounded one on top of the other ??

Yes, this is recommended!

Tonight reports on my remote monitor are 3dB down. I made a modification

I have finally connected a wire from top terrace to the fire extinguish pipe which runs inside the building down

to the basements, were pumping system is located. The wire is not yet connected to the ground side of the vertical

BUT the actual radial counterpoise runs parallel to this wire for about 5m

Seems like this can be the cause of 3dB looses.

...but maybe the situation is different when matching the PA properly. In the moment you don't know at all what the feed point impedance is. ...and how the PA behaves at that impedance connected.

 Keep tuned !

RR. GL,

73, Stefan