Message-ID: <002301cbe74d$385936e0$8d01a8c0@JAYDELL>
From: <jrusgrove@comcast.net>
To: <rsgb_lf_group@blacksheep.org>
References: <008001cbe71a$472d7b00$0401a8c0@xphd97xgq27nyf> <1300648453.2368.16.camel@gerhard-desktop>
Date: Sun, 20 Mar 2011 18:21:52 -0400
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Subject: Re: LF: VLF
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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
>>  
> 
>