Message-ID: <422A476EC5844326842C18BCC62D032D@PcMinto>
From: Minto Witteveen <minto.witteveen@gmail.com>
To: <rsgb_lf_group@blacksheep.org>
References: <4E29AB51.1040401@iup.uni-heidelberg.de> <4E29ADE8.6060706@iup.uni-heidelberg.de> <4E29BC6E.8030500@iup.uni-heidelberg.de> <8486B5CCE6EA4804B9957C9C25CEE702@PcMinto> <001101cc4912$8938c5e0$0401a8c0@xphd97xgq27nyf>,<3BEB06475E9047058E91633D4C919360@PcMinto> <BF4A524700075746A6467658DFC7102CA3249A4526@ICTS-S-EXC2-CA.luna.kuleuven.be>
In-Reply-To: <BF4A524700075746A6467658DFC7102CA3249A4526@ICTS-S-EXC2-CA.luna.kuleuven.be>
Date: Mon, 25 Jul 2011 21:34:58 +0200
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Subject: LF: Re: DL6NN on 137
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Hi Rik,
Thanks for the heads-up.
I think your antenna is better than mine, but possibly not by much. I do 
have another concern however, and that is the high voltage at the antenna. 
The capacitance at 136 kHz is (measured) 390 pF. With a total system 
impedance of 150 Ohm and 1 kW this translates to 7.7 kV!!
On 500 I already had some "interesting" phenomena  with 5 kV. The antenna is 
end-fed here in the shack in the attic.
So I will have a fire extinguisher at hand when tx-ing on 136..

Regards,
Minto pa3bca.

--------------------------------------------------------------------------
Ceterum censeo Carthaginem delendam esse
-----Original Message----- 
From: Rik Strobbe
Sent: Sunday, July 24, 2011 20:51
To: rsgb_lf_group@blacksheep.org
Subject: RE: LF: DL6NN on 137

Minto,

I was active on 136kHz with a similar antenna (15m high, 25m long "lazy-L" 
antenna) and in addition the losses were very high (abt. 130-160 Ohm).
Despite that I managed to work distances up to 1600km in regular CW (best DX 
= OH1TN).
So don't dispair.

73, Rik  ON7YD - OR7T