RE: LF: EA5DOM <crazy> vertical

[Markus Vester <markusvester@aol.com>]

Hi Luis,

 

> May be it affects the radiation pattern a bit.

 

This might make some sense. A slant loop could be seen as a superposition of a big horizontal loop (which doesn't radiate), plus a low vertical loop (which weakly radiates in a figure-eight pattern, with lobes to east and west). But perhaps one shouldn't try to draw too many quantitative conclusions from successful vs unsuccessful WSPR receptions as other parameters (eg local RX noise) may play a large role.

 

Best 73,

Markus

 

-----Ursprüngliche Mitteilung----- 
Von: VIGILANT Luis Fernán   dez <luis@vigilant.es>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Fr, 12 Jun 2015 10:54 am
Betreff: RE: LF: EA5DOM <crazy> vertical

Hi Stefan

 

Yes. I can completely remove the cable for the motor at the antenna. It uses a connector

But then I wouldn't be able to retract it quickly (or remotely) in case of storm

I would have to access the top terrace and plug the motor cable

 

The other option is to disconnect the motor cable from the antenna controller down on the shack. So, easier to reconnect

The cable should be left "floating" whith any HV picked or I can even connect it to a gas discharge tube to GND

 

I keep transmitting WSPR + Opera + QRSS10 every 15 minutes

So far got reports from stations located North, but EA1FBU can't see my signal being NW and no reports from Italy at NE either

The loop is not completely horizontal. It is about 4m higer in the north, than in the sides and south. May be it affects the radiation

pattern a bit. But there are (still) not so many monitors with good Rx to confirm this 

 

73 de Luis

EA5DOM

---

De: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] En nombre de DK7FC
Enviado el: jueves, 11 de junio de 2015 16:45
Para: rsgb_lf_group@blacksheep.org
Asunto: Re: LF: EA5DOM <crazy> vertical

Hi Luis,

BTW. Those 24kV at 800 W can explain some pictures shown in this reflector ;-)

I know someone who has up to 45 kV rms on his LF antenna... 
 

Will test it at low power first and see what happens. Think I can measure induced voltage on motor coils and this will show the risk of increasing power

Can't you remove the cable of the motor so it is floating at high potential too?

I'm still in the process of getting access to the fire extiguish pipe to clamp a wire up to the antenna. It is not easy, but can be done

That sounds fine!

73, Stefan

 

73 de Luis

EA5DOM