Re: LF: FIRE,Tyre, trailer from DK 8 ND

["Hans-Albrecht Haffa" <dk8nd@web.de>]

Dear Mal,
for my impression the capacity between antenna base and groundplane is pretty 
big for LF operation. The trailer will have about 4 m2 or so as surface to 
ground.  On shortwave a spacing between vertical and support mast of about one 
ore mor diameters
of the vertical is recomended.  This means: Put Your trailer on empty boxes of 
beer  to reduce ground capacity of the vertical element.


55,
Hans-Albrecht DK 8 ND  (cba)


-----Ursprüngliche Nachricht (HTML) wurde als Anlage beigefügt.-----
Von:      rsgb_lf_group@blacksheep.org
Gesendet: 05.01.05 18:47:54
An:       "Hans-Albrecht Haffa" <dk8nd@web.de>
Betreff:  Re: LF: FIRE


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-----Ursprüngliche Nachricht wurde als Attachment angehängt.-----

Von:	rsgb_lf_group@blacksheep.org
Gesendet:	05.01.05 18:47:54
An:	"Hans-Albrecht Haffa" <dk8nd@web.de>
Betreff:	Re: LF: FIRE

Hi Mal

 

tyres today are filled with a bit of carbon which reduces the static build up

and shock when leaving the car . I never measured the resistance and it doesnt have

to be high to allow for bleed off. However, I suspect they dont work well as a LF base

HAR

 

Bob K3DJC  

 

On Wed, 5 Jan 2005 16:22:58 -0000 "hamilton mal" <g3kev.ham@virgin.net> writes:

Hi All

I have a trailer mounted telescopic lattice mast that might be useful for LF work. The trailer has two wheels with pneumatic tyres insulating it from the ground. I thought I might load this mast with a suitable loading coil in series for 137 khz but because of the high voltages the tyres might catch fire. Has anyone tried this before. 

73 de Mal/G3KEV