From: "Mike Dennison" <mike.dennison@rsgb.org.uk>
To: rsgb_lf_group@blacksheep.org
Date: Tue, 6 Jun 2000 13:30:36 +0100
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Subject: Re: LF: Re: Copying CW
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Dick, PA0SE wrote:
> I have tested "pseudo-stereophonic" reception of CW by feeding the halves
> of a stereo headphone via series tuned circuits resonating at  1002 and
> 842Hz (922 ą 80Hz)  respectively. At first the result  was pleasant; it
> sounded like being in a room with the wanted 922Hz signal in the centre.
> But it did not take me long to find out that it contributed absolutely
> nothing to the readibility of signals under difficult conditions.
> It proved again that our sophisticated ear/brain system cannot be helped
> by such primitive contraptions.

Yes, I'm aware of this but am keeping an open mind. I have already 
done some interesting tests that combine some of the advantages 
of both analogue and digital techniques. One crude test last 
weekend produced significantly better readability of a weak station 
in heavy static than was available either direct from my radio, or via 
a DSP unit.

What sparked off this idea was the number of people who agreed 
that listening to a pair of headphones on the bench gave them 
better reception than when the phones were on the head. Therefore 
there appears to be at least one uninvestigated way of enhancing 
reception which at present relies on chance and acoustics.

I agree that all theoretical work tends to ignore the colossal 
advantage of using the brain, but I am not a theorist and would like 
to find ways of helping the brain along a bit.

Thanks very much to all those who replied re time delays.

As soon as I have reached some conclusions I will report my 
results - or that Dick is indeed right and the brain can't be helped at 
all!


Mike, G3XDV (IO91VT)
http://www.dennison.demon.co.uk/activity.htm