From: =?utf-8?B?VklHSUxBTlQgTHVpcyBGZXJuw6FuZGV6?= <luis@vigilant.es>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Thread-Topic: LF: VLF Small magnetic antenna for Tx
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Date: Sat, 3 Feb 2018 19:49:25 +0000
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Subject: RV: LF: VLF Small magnetic antenna for Tx
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Sorry, Typo: I mean I need 2H to resonate the antenna, not 2mH
________________________________________
De: VIGILANT Luis Fernández
Enviado: sábado, 3 de febrero de 2018 20:46
Para: rsgb_lf_group@blacksheep.org
Asunto: Re: LF: VLF Small magnetic antenna for Tx

Thank you all for the very interesting comments. Looks like there is a lot to investigate in this field
and that is good. Wide room for further investigations :-)

Jacek, you mentioned what I was midnight oiling here
" If you want some semi-DX in the H-field, then try coupling into some long
conductors (pipes, power lines, railway tracks etc)"

What about coupling the loop to my 90m vertical ?
Adding another transformer from loop to vertical or just winding some coils of the vertical over the
small loop ring would work ?

Of course a tuned vertical with a huge coil would work better and run more current. But it is very hard
for me to get more than 180pF antenna capacity and that means 2mH coil for 8270Hz :(

Looks like this is something "easier" to test than winding super coils
What do you think about the coupling system ?

73 de Luis
EA5DOM
________________________________________
De: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] en nombre de DK7FC [selberdenken@posteo.de]
Enviado: sábado, 3 de febrero de 2018 17:57
Para: rsgb_lf_group@blacksheep.org
Asunto: Re: LF: VLF Small magnetic antenna for Tx

Or here:
https://de.wikipedia.org/wiki/Nahfeld_und_Fernfeld_(Antennen)#Nahfeld
73, Stefan

Am 03.02.2018 11:24, schrieb Clemens Paul:
> Hi Jim,
>
>
>> At 38kHz the impedance of the transmitting loop’s field at 100
>> meters is ~ 25 ohms,
>>
> I've found a graph showing Z_Wave over D/ʎ.
> Near the loop: Z_wave = 377*(2pi*D) / lambda
>
> 73
> Clemens
> DL4RAJ
>
>
>
>> -----Original Message-----
>> From: owner-rsgb_lf_group@blacksheep.org
>> [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of
>> hvanesce@comcast.net
>> Sent: Thursday, February 1, 2018 11:22 PM
>> To: rsgb_lf_group@blacksheep.org
>> Subject: RE: LF: VLF Small magnetic antenna for Tx
>>