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
|
