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Date: Sun, 10 Sep 2017 12:51:30 +0200
From: DK7FC <selberdenken@posteo.de>
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Subject: Re: VLF: Carrier on 8270.00709 Hz
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Status: RO

Hi Joe,

As Jacek told, there are of course several more distributors for that 
module, not just amazon. Try to find another source and you will have it 
in a few days. Maybe it will be a bit more expensive. Even in amazon i 
can click "Lieferung morgen" (delivery tomorrow), and i will find 
distributors that seem to be in-land.

Am 09.09.2017 18:46, schrieb jcraig@mun.ca:
> Hi Stefan,
>
> Your sliding bucket VLF coil is making me envious.  Markus uses this
> method as well.  I am using the pies configuration and limiting my 
> current
> to 1/4 amp to prevent high voltage problems.

250 mA is already respectable. I thought you have much less.
>
> After some tinkering I managed to get 1/3A with 2 large pies (~100mH) and
> one small one.  The total was 500mH at 150 ohm DC so very low loss,
> but very difficult to find the shorted turns when it arcs out.
Same problem here. My large coil had just 680 Ohm at 6.1 H! But as soon 
as there was a short cutted stack, it is a lot of work to repair it. 
With the stracked buckets you can reach the faulty windings at once. 
When deciding for that concept last year, it didn't expect critical 
field strengths at all.
>
> You are correct that winding VLF coils is relaxing.  There is one motor
> to twist the 24 0.08mm wires together and another to wind them on the
> lexan spindles. The next step is to use 3 or 4 spindles and think about
> how reduce the voltage gradients.  It is relaxing watch this action.  
> When I get bored  watching, I go in the back yard and work on aerials 
> for a while and check the winding later as it progresses.
Well said :-) That the easy way to do it. Just wind a few hours, when it 
gets boring just make a break and continue the next day. Listen to some 
good music, e.g. https://www.youtube.com/watch?v=W4ga_M5Zdn4 and think 
about gigantic DX and deepest frequecies.
>
> You mentioned I should set a goal of 150 uW.
At least. I would try to reach the voltage limit of the antenna 
wire/isolators.
>   The big RL is up again
> and I'm looking out for cheap car audio amps so progress is being
> made towards higher ERP.
How much power are you running presently?
And who is the next receiving station to you? Is it really Paul? No one 
else in a 4000 km radius???

73, Stefan