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Date: Tue, 13 Jan 2009 18:36:25 +0100
From: uwe-jannsen@versanet.de
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: Antenna Diversity
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Hi Mal,

pse see also

http://home.versanet.de/~uwe-jannsen/two.htm

regards
Uwe/dj8wx



Zitat von mal hamilton <g3kevmal@talktalk.net>:

> LF/MF
> I am experimenting at present with antenna (space diversity) using 
> two loops. Loop A is 40 metres perimeter vertical orientation, Loop B 
> is 190 metres perimeter also vertical.  Both loops optimum E/W.
> I am using two receivers in this experiment Ant A to Siemens D2155 
> level meter, BW 20 Hz and vy stable, Ant B to Datong up converter and 
> IC746 250 Hz BW. Both audio outputs to soundcard/ARGO display 
> allowing 50 hz separation for observation.
> Observing DI2AM at present and having calibrared this signal on both 
> RX outputs at a point in time, both signals are fairly constant but 
> more variations have been observed on Ant A - 40m loop, the signal 
> surges in strength and then fades down, whereas Ant B has a more 
> constant output with less fade.
> More time is needed for a proper assessment and DI2AM is also a 
> strong signal. I would need a few long haul signals for a proper test 
> like Russian or USA .
> Interested in MF signals at present.
> This method would also work with a couple of small loops or a loop 
> and probe type antenna, then at a glance one would know how each was 
> performing, of course with the loop in the optimum direction for 
> target signal.
>
> This is just a simple setup, it works well and no audio cross mod 
> noticed, nice clean signals on display in spite of the fact that the 
> separation is only 50hz.
> A nice balanced mixer would be a more sophisticated approach, that 
> might come later.
>
> 73 mal/g3kev
>
>