Message-ID: <006e01cbec17$2c9757f0$8d01a8c0@JAYDELL>
From: <jrusgrove@comcast.net>
To: <rsgb_lf_group@blacksheep.org>
References: <008001cbe71a$472d7b00$0401a8c0@xphd97xgq27nyf> <1300648453.2368.16.camel@gerhard-desktop> <002301cbe74d$385936e0$8d01a8c0@JAYDELL> <1301093963.1739.15.camel@gerhard-desktop>
Date: Sat, 26 Mar 2011 20:37:38 -0400
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Subject: Re: LF: VLF
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Gerhard

Thanks for the info. Nice work!

Jay


----- Original Message ----- 
From: "Gerhard Hickl" <gerhard.hickl@aon.at>
To: <rsgb_lf_group@blacksheep.org>
Sent: Friday, March 25, 2011 6:59 PM
Subject: Re: LF: VLF


> Hello Jay!
> 
> Sorry for my late reply....
> 
> My former is the rest of a 400l barrel made out of an unknown plastics.
> Once it was filled with activated coal and used for filtering air
> contaminated by fuel-vapour. When I got it, it was empty and the coal
> was removed.
> 
> I sawed off the bottom and the top. Still it is heavy but stiff.
> 
> The outer diameter is 725mm, thickness of the material is about 10mm.
> 
> 73
> OE3GHB
> Gerhard
> 
> 
> 
> 
> 
> 
> 
> 
> Am Sonntag, den 20.03.2011, 18:21 -0400 schrieb jrusgrove@comcast.net:
>> Gerhard
>> 
>> Nice looking coil. What are you using for a form?
>> 
>> Jay W1VD  WD2XNS  WE2XGR/2
>> 
>> 
>> ----- Original Message ----- 
>> From: "Gerhard Hickl" <gerhard.hickl@aon.at>
>> To: <rsgb_lf_group@blacksheep.org>
>> Sent: Sunday, March 20, 2011 3:14 PM
>> Subject: Re: LF: VLF
>> 
>> 
>> > Hello Mal, group!
>> > 
>> > As far as I know, Markus and Ossi both use multi layer coils. They are
>> > very compact but with the known problems regarding insulation. I think
>> > Markus meanwhile has also a single-layer "stack"-type...some flower pots
>> > building a stack.
>> > 
>> > My coil is a single layer type with variometer inside. Basically the
>> > same design that Stefan has in use, just a bit bigger.
>> > 
>> > It is calculated for about 100m vertical wire (=roughly 600pf, pretty
>> > much the same as my fixed antenna has) and the inductance is about 450
>> > to 575mH. DC-resistance is about 140R.
>> > 
>> > I will have to make some taps for longer wires (kite) but I had no
>> > chance to give it a try.
>> > 
>> > See the two pictures enclosed.
>> > 
>> > I was transmitting from about 00:00z today until now on 8969.98 with a
>> > break of about 90 minutes in the early afternoon. I switched to full
>> > power roughly at 10z. The power I used before was about 6db lower in
>> > order to maintain safety while the equipment was unattended. This
>> > produced a nice trace on Paul's receiver.
>> > 
>> > 
>> > 73
>> > OE3GHB
>> > Gerhard
>> > 
>> > 
>> > 
>> > 
>> > 
>> > Am Sonntag, den 20.03.2011, 16:17 +0000 schrieb mal hamilton:
>> >> It looks like all VLF acty has ceased today. No indication about what
>> >> is going on.
>> >> Those using large coils to resonate kites and balloons, are these
>> >> coils single layer or pile wound, multi layer etc 
>> >> A lot of turns would be needed for single layer and insulation
>> >> breakdown could be a problem for pile/lump wound.
>> >> de mal/g3kev
>> >>  
>> > 
>> >
>> 
> 
> 
>