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Re: LF: LF antenna progress at DK7FC

from [Roger Lapthorn] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: LF antenna progress at DK7FC
From: Roger Lapthorn <[email protected]>
Date: Fri, 1 Apr 2011 22:44:30 +0100
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Is this for VLF Stefan or 137kHz?

73s
Roger G3XBM

2011/4/1 Stefan Schäfer <[email protected]>
LF,

I'm happy to have my LF "office" antenna almost finished. Today i connected the coil in its end position to the 90m wire in 35m height. A massive isolator fixes the feedes which is out of copper tube.
See some photos at

http://dl.dropbox.com/u/19882028/feeder.JPG
http://dl.dropbox.com/u/19882028/little%20isolator.JPG
http://dl.dropbox.com/u/19882028/hidden%20coil.JPG

BTW, matching is done by using a galvanic decoupled primary coil (10 cm diameter) inside the main LF coil (20 cm diameter) and the cable to the PA is CAT5 LAN cable! This is because i will chosse a H bridge as the PA which which have main potential and i want to shield both wires which are 2x 4insulated wires now. This may be even better than RG58 regarding skin losses :-)

73, Stefan/DK7FC

PS: I can see the antenna wire out of 800m distance :-)






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