Re: VLF: in EA?

[VIGILANT Luis Fernández <luis@vigilant.es>]

Hi VLF

No gardening at all. Just following the way Stefan and others paved so clearly ;-)

This is a motorized table to make winding an easier task. The pot is 50cm diameter but don't trust the

quality and resistance to UV light. Will test a different model more rugged and about the same size

Another picture showing the details of this "tricotosa"

https://www.dropbox.com/s/05pgt96om2meqwb/IMG_20190210_104538_802.jpg?dl=0

Got a 7Kg x 0.20mm coil of wire from a company which used to wind their own motors (time ago)

Yes Stefan, I plan to use the double side bonding tape and kapton. One question about it:

Do you place kapton over the plastic as a base layer ? or just covering the coil as end layer ?

73 de Luis

EA5DOM

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De: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] en nombre de DK7FC [selberdenken@posteo.de]
Enviado: domingo, 10 de febrero de 2019 14:01
Para: rsgb_lf_group@blacksheep.org
Asunto: Re: VLF: in EA?

Hi Luis,

Great! I somehow know that plastic pot :-)
What is the wire diameter?
Make sure to use double-sided bonding tape between the pot and the wire, otherwise the winding will move when becoming warm and cold and warm and cold again. Also i would really recommend to use that Kapton tape, the cheap version from China is fully OK, for example: https://www.amazon.de/dp/B00CAMEB4W

Good luck :-)

73, Stefan

Am 10.02.2019 13:41, schrieb VIGILANT Luis Fernández:

Hi VLF

Congratulations Dimitris :-)

Anybody mentioned an activity rush in VLF ? I'm working on this right now

https://www.dropbox.com/s/1vkmlm8kn80688l/IMG_20190210_104522_952.jpg?dl=0

73 de Luis

EA5DOM

El 9 feb. 2019 1:26 p. m., DK7FC <selberdenken@posteo.de> escribió:

Hi Dimitris,

My congrats! That is a good success and progress!

Can you tell more details?
How much power was used?
How much antenna current?
Was it the 3 turn loop?
What type of receiver was used on the RX site?
Is that site in a quiet location?
Which bandwidth or mode?
Was it actually QRSS-10 (Which i would watch in 122 mHz)?
What was the SNR?
Is there a screenshot for us to see?
What is your plan for today? :-)
Who is the next distant station?

This could be the beginning of a growing worldwide VLF activity, if you
can 'mobilise' a team of stations who build up RX and TX systems arround
VK.

73, Stefan


Am 08.02.2019 23:01, schrieb Dimitrios Tsifakis:
> Hi Stefan and VLF,
>
> well, I am now officially hooked! My signal on 29.5 kHz (VLF's edge)
> has been detected 22.3 km away in Canberra by Dale VK1DSH. Only
> casualty is the russian mica capacitors (K31-11-3) which got really
> hot (I was focusing on the amplifier and neglected the poor caps). I
> had 4 of them in parallel, each 4700 pF.  Maybe they will recover if I
> let them cool down :-)
>
> That's probably a first for Australia, I haven't heard anyone else
> doing tests like this.
>