From: Roman <rw3adb@YANDEX.ru>
To: rsgb_lf_group@blacksheep.org
In-Reply-To: <6DB8451D7F3D3947A5918808A59621EA08524F3A@servigilant.vigilant.local>
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Date: Thu, 05 Jul 2018 22:32:13 +0300
Message-Id: <854051530819133@web37o.yandex.ru>
Subject: Re: LF: RE: Summer games / EARTH ANTENNAS
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Practic baloon antenna for 160m - 39m high.

https://youtu.be/dgnseC-IJcA

731
Roman

> Mmmm. Kite antennas are for summer ;-)
> 
> Have a look at this technique. Mixing Kite aerodynamics with hellium lift-off push you get a real stable system to keep a wire up for long time and
> 
> dealing with wind. Probably not cheap, I’m afraid. They have a distributor in DL
> 
> http://www.allsopp.co.uk/index.php?mod=page&id_pag=58
> 
> 73 de Luis
> 
> EA5DOM
> 
> De: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org]
> En nombre de DK7FC
> 
> Enviado el: martes, 03 de julio de 2018 23:42
> 
> Para: rsgb_lf_group@blacksheep.org
> 
> Asunto: Re: LF: RE: Summer games / EARTH ANTENNAS
> 
> Hi Marcin,
> 
> Keep us informed about your experiments. For you it may be more useful to try kite antennas! Give it a try, it is very easy a nd exciting!
> 
> For power generation i used such a cheap generator:
> https://www.amazon.de/dp/B000QD1EHY/
> 
> For 500W it was running quite well, until i made the mistake to mix the oil and fuel BEFORE filling it into the tank.
> 
> It is cheap and not very high quality but it is possible to carry it on your own, which was essential for my kite experiments.
> 
> If you want quality, then by a Honda generator...
> 
> 73, Stefan
> 
> Am 03.07.2018 21:26, schrieb Marcin:
> 
>> Hello Stefan!
>>
>> From my experience, erth dipole work best on 630m. Unfortunately, in the north of Poland, the soil is well or very conductive. In rocky ground you can get much better results.
>> I am waiting for autumn to continue my experiments.
>>
>> https://klubnl.pl/wpr/en/index.php/2018/01/09/most-na-wisle-elementem-anteny-czyli-eksperymentow-z-dipolami-ziemnymi-ciag-dalszy/
>>
>> https://klubnl.pl/wpr/en/index.php/2017/11/26/kolejne-proby-z-antena-dipol-ziemny/
>>
>> I am looking for a power generator for power supply in the field.
>> Can anyone recommend something?
>>
>> 73! Marcin SQ2BXI
>>
>> From:
>> owner-rsgb_lf_group@blacksheep.org
>> <owner-rsgb_lf_group@blacksheep.org>
>> On Behalf Of DK7FC
>>
>> Sent: Tuesday, July 3, 2018 7:50 PM
>>
>> To: rsgb_lf_group@blacksheep.org
>>
>> Subject: LF: Summer games / EARTH ANTENNAS
>>
>> Hi Joe, VLF,
>>
>> You seem to like to 'play' on the very low frequencies during the sunny days :-)
>>
>> Same here! My YL bought a house in JN39XI and we are spending almost each weekend there in the peaceful silence. The forest is really great! I guess you know that, as a Canadian.
>>
>> Now i'm planning to receive some signals in
>> JN39XI07 . BTW a most useful distance for analysing my own signals from Heidelberg (about 55 km QRB).
>>
>> Oh and i think about playing with earth antennas again, you know!
>>
>> BTW did someone (of the group) ever tried to build a full size dipole for 137 kHz? I mean for transmitting! On a stony mountain/hill it could be better than expected. With a Raspi + GPS module one could build up a simple WSPR beacon and a ICL7667, which can
>> be driven by the 3.3 V GPIO output voltage could make a simple and effective 5W PA running at 12V.
>>
>> The wire just needs to be 1000m long or so. In a low frequented forest it could lay there for some days...
>>
>> I remeber experimenting with a full size dipole on 630m in 2012, when the band was quite young. It worked well although the antenna was just 4m above the ground and the soil conductivity was not ideal (medium conductivity). A few CW QSOs were done out of a
>> 7 Ah gel battery and just 50W or so, in July!
>>
>> And what about VLF and ULF using earth antennas? I remember making 45 km distance on 8.97 kHz from the 700m long wire antenna, grounded at each end (250W RF power if i remember correctly). That was about 15 dB in 3.8 mHz. But what would be possible on lower
>> frequencies if the far end of the wire is well grounded?
>>
>> Time to fill that summer hole (activity)!
>>
>> 73, Stefan
>>
>> Am 03.07.2018 14:03, schrieb jcraig@mun.ca:
>>
>>> This was the first time SAQ was heard here using a mobile RX. It was in a quiet location, a km from mains lines and other RF pollution. SAQ became quite weak when
>>>
>>> the RX was in the forest however. The trees must be good conductors at VLF.
>>>
>>> Is the low-power miniwhip mentioned below the same new one designed with
>>>
>>> help from G4COL with a J310, Rs= 47-270 ohm and the FT-37-43 xfmr? I'd like
>>>
>>> to try that at VLF.
-- 
73!
Roman, RW3ADB