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Re: LF: RE: Earth antenna transmissions on a guide rail?!??

To: [email protected]
Subject: Re: LF: RE: Earth antenna transmissions on a guide rail?!??
From: Roman <[email protected]>
Date: Fri, 27 Jul 2018 21:24:42 +0300
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TNX Marcin!

> Roman!
> 
> 2km in mobile magnetic loop RX station.
> 
> 73! Marcin
> 
> -----Original Message-----
> From: [email protected] <[email protected]> 
> On Behalf Of Roman
> Sent: Tuesday, July 24, 2018 9:38 PM
> To: [email protected]
> Subject: Re: LF: RE: Earth antenna transmissions on a guide rail?!??
> 
> Hi Marcin!
> 
> Whats QRB?
> 
> Roman
> 
>> Hello Stefan!
>>
>> The signal-to-noise ratio of the movie is very good. The experiment is 
>> interesting and inspired me.
>>
>> In January we tried to transmit on 8.27 kHz from a horizontal loop antenna. 
>> Team SP5WPK, SQ5BPF and SQ2BXI stretch the 500m wire. Ground was very good, 
>> by the river. The effect was not good. Information about the experiment in 
>> Polish:
>>
>> https://klubnl.pl/wpr/en/index.php/2018/02/10/nadawczy-eksperyment-z-duza-pozioma-antena-petlowa-na-827khz/
>>
>> 73! Marcin SQ2BXI
>>
>> From: [email protected] 
>> <[email protected]> On Behalf Of DK7FC
>> Sent: Monday, July 23, 2018 11:18 PM
>> To: [email protected]
>> Subject: Re: LF: RE: Earth antenna transmissions on a guide rail?!??
>>
>> Hello Marcin,
>>
>> Oh, from LA3EQ, we know that man, at least from the LF/MF WSPR database. If 
>> i remember correctly he has been here ion the list some years ago.
>>
>> Listening from an antenna which is so close to the road? Should sound funny.
>> But i've been a bit disappointed, he just connected the coax between two 
>> very close disconnected parts of the guard rail. First i thought he 
>> installed an isolated (!) wire of 8 km length. These two segemnts should 
>> form a very small ground loop only. Of course it will generate some signal 
>> voltage. The Alphas were visible too. But what about ZEVS and the 
>> Schumann's, if he's talking about 10 Hz?
>>
>> Meanwhile i thought a bit more about the preparations. I think i'm going to 
>> use that 0.4 mm diameter enameled cu wire that i have laying arround here, 
>> about 2000m is available from the unwound part of the 2.97 kHz coil. For the 
>> first test on the 450m distant guide rails this should work reasonably. The 
>> DC resistance will be about 65 Ohm which could be a significant part of the 
>> overall loss, hopefully :-) But then i'll have an impression of the earth 
>> electrodes resistance.
>> So i need to prepare a GPS locked signal generator and PA and a suitable 
>> output transformer providing something between 50...350V at 8.27 kHz...
>>
>> 73, Stefan
>>
>> Am 23.07.2018 21:28, schrieb Marcin:
>>
>>> Hello Stefan
>>> A very interesting idea for an experiment.
>>> Looking at the video below should get good results.
>>>
>>> https://www.youtube.com/watch?v=sWsdaSmWg7E
>>>
>>> 73! Marcin SQ2BXI
>>>
>>> From: [email protected] 
>>> <[email protected]> On Behalf Of DK7FC
>>> Sent: Sunday, July 22, 2018 8:28 PM
>>> To: [email protected]
>>> Subject: VLF: Earth antenna transmissions on a guide rail?!??
>>>
>>> Hi all,
>>>
>>> During the weekend i am in the Pfälzer Wald again which is such a nice 
>>> place to be! I already installed a fixed E field antenna for VLF/ULF 
>>> reception in JN39XI06 :-)
>>>
>>> Now i have the idea to use a guide rail (attachment!) as an electrode for a 
>>> earth electrode antenna! There is a perfect road which is not much 
>>> frequented and where no way is crossing so i could temporary install a long 
>>> wire on the ground between two of these guide rails. I would assume they 
>>> provide a good grounding. They are located on a relatively high 
>>> hill/mountain with stony ground. The mountain is very steep there and in 
>>> some distance, 200m deeper, there is a brook..
>>>
>>> With some luck the ground losses can be near 200 Ohm? Maybe rather 300 Ohm. 
>>> I'm going to prepare things and plan to transmit for some time next 
>>> weekend. If the ground loop actually acts like a loop, the bearing should 
>>> be 135 deg, so it will be in a 45 deg angle towards my QTH where my grabber 
>>> is listening in 55 km distance. That's quite a good distance for testing! 
>>> I'd like to try LF and VLF, maybe ULF it all works well.
>>>
>>> A BTW the wire length will be 860 m! However there are two guide rails in a 
>>> shorther distance, about 450 m. I will try the shorter length first, to get 
>>> an impression of the loss resistance and to see if something is visible at 
>>> all :-)
>>>
>>> 73, Stefan
> 
> --
> 73!
> Roman, RW3ADB
-- 
73!
Roman, RW3ADB

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