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Re:LF: Cardioid RX antenna for LF...

from [manginbenoit.pro] [Permanent Link][Original]
To: [email protected]
Subject: Re:LF: Cardioid RX antenna for LF...
From: "manginbenoit.pro" <[email protected]>
Date: Sun, 13 May 2012 19:41:34 +0200
In-reply-to: <[email protected]>
References: <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
GE Stefan and all,

Try and see Jean-Pierre / F1AFJ 's page, he built and modeled a 2-turn K9AY, the one he uses for his grabber.

Nothing to say about performance, it seems. Judge it by the summer T/A captures... Plus, (I did not test it) his QSD RX es MMIC preamp seems to work VY FB.

I tried a 2-turn K9AY for 160, but it is definetely too long, there is too much wire. 0,2 lambdas seems to be a maximum. Voltage levels are correct but directionnal properties degrade seriously.

Nevermind on 137, we will never reach a quarter-wave long RX antenna !!!

Maybe a 2-turn Flag should be tested ? Does anybody use MMANA ? I can try and model one using this software.

I don't use EZNEC at all.

de F8GRY/Ben




> Message du 13/05/12 19:12
> De : "Stefan Schäfer"
> A : [email protected]
> Copie à :
> Objet : LF: Cardioid RX antenna for LF...
>
> Hello Group,
>
> I've just started to play a bit in EZNEC, trying to simulate a receive
> loop antenna for the new YV7MAE grabber.
> http://dl.dropbox.com/u/74746618/LF/YV7MAE_LF_Grabber.html ... still
> using a wire receive antenna with excellent results but now a
> directional antenna is needed.
>
> So i modelled a loop with a possible shape and a ground connection. Then
> i added a R on the far end of the source. The results of the elevation
> and 3D plot are surprising good. Maybe i have done a mistake in
> modelling? Optimal performance was obtained at R = 8 kOhm. This resulted
> in the best F/B and beamwidth... Results of ZENEC are here:
> http://dl.dropbox.com/u/19882028/LF/Cardioid%20for%20LF.png
>
> Any ideas, experiance or advice?
>
> I guess a preamp is needed when such a antenna is used. The typical 1:9
> un-un does not look useful for me...
>
> 73, Stefan/DK7FC
>
>
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