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Date: Sun, 13 May 2012 22:37:32 +0200
From: Hartmut Wolff <h-wolff@gmx.de>
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Content preview: Am 2012-05-13 19:08, schrieb Stefan Schäfer: > Any ideas,
experiance or advice? Stefan, your model shows a lot of thermal noise and
the gain is very low. Outer Ring below 70dBi is not useable. Attached is a
Eznec file with a cardiod antenna I used with good results. The additional
preamp had about 20dB gain. [...]
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Subject: Re: LF: Cardioid RX antenna for LF...
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Am 2012-05-13 19:08, schrieb Stefan Schäfer:
> Any ideas, experiance or advice?
Stefan,
your model shows a lot of thermal noise and the gain is very low.
Outer Ring below 70dBi is not useable.
Attached is a Eznec file with a cardiod antenna I used with good
results. The additional preamp had about 20dB gain.
The here mentioned antennas from Dallas Lankford are mostly Flag arrays
which are working great down to 0,5MHz! But for 137kHz the gain is to low.
--
73
Hartmut
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