Binaural CW tuning

[PA3GYU]

Vic Wrote:

>I've always wanted to try some kind of
>crossover device that would distribute the signal between the two
>earphones according to frequency.  Then as I tune through a CW signal,
>it would seem to move.
This has been on my mind too for a long time. I even seem to recall I've
got a schematic saved somewhere for a circuit that does just that, so
somebody beat us to it. I just never came around to built and test it for
myself.... For details, contact me offline and I'll try to dig up the circuit.

I'd expect the hiss that 'll always appear in one ear to cause fatigue.

Anybody 'been there, done that' and willing to tell us about it?

Bart de PA3GUY

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[Mike Scott-7]

Look in "Experimental Methods in RF Design".
The article there also references a lot of QST articles.

Mike Scott
AE6WA
Tarzana, CA (near LA)
Elecraft KX1 4-Watts


-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of pa3gyu
Sent: Thursday, May 25, 2006 12:34 AM
To: [hidden email]
Subject: [Elecraft] Binaural CW tuning

Vic Wrote:

>I've always wanted to try some kind of
>crossover device that would distribute the signal between the two
>earphones according to frequency.  Then as I tune through a CW signal,
>it would seem to move.
This has been on my mind too for a long time. I even seem to recall I've
got a schematic saved somewhere for a circuit that does just that, so
somebody beat us to it. I just never came around to built and test it for
myself.... For details, contact me offline and I'll try to dig up the
circuit.

I'd expect the hiss that 'll always appear in one ear to cause fatigue.

Anybody 'been there, done that' and willing to tell us about it?

Bart de PA3GUY

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[Geoffrey Mackenzie-Kennedy-2]

 Bart PA3GUY wrote:

> This has been on my mind too for a long time. I even seem to recall I've
> got a schematic saved somewhere for a circuit that does just that, so
> somebody beat us to it. I just never came around to built and test it for
> myself.... For details, contact me offline and I'll try to dig up the
> circuit.
>
> I'd expect the hiss that 'll always appear in one ear to cause fatigue.
>
> Anybody 'been there, done that' and willing to tell us about it?

 ----------------------------------------------------------------------

 Back in 1973, G3OTK suggested a high pass - low pass filter scheme to
obtain
 a pseudo-stereo effect for binaural reception, and I believe that his
 filters 'crossed over' at 500Hz.  I would agree that something would have
to
 be done about hiss coming from the 'high frequency' channel, but it might
 have to be something more clever than just adding a low pass 'hiss
filter' -
 I don't know.

 PA0CX came up with a very interesting scheme in 1958 named
 'Frequencieschaar' which split a double sideband AM signal into two halves
 so that a pseudo-stereo audio output could be obtained. This helped to
 overcome the problems of selective fading and QRM. Also in Chapter 9 of
 'Experimental Methods in RF Design' by W7ZOI, KK7B and W7PUA there is an
 example of a simple binaural receiver taken from QST, March 1999.

 Personally I like to use binaural reception. Why is difficult to explain,
 but the effect is like being 'inside' the band with signals on each side
 which helps the a lot when trying to listen to one signal amongst the QRM.

 73,
Geoff
GM4ESD


 



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[David Giles]

Hello all,
An idea for the KDSP2 option?  Use the DSP to generate the 90deg delay for the
I-Q outputs.  Taking these two outputs (at or near the drains of FETs Q6 and
Q7) to an outboard dual pot and stereo headphone amplifier could be a simple
way to experiment with this mode.  

My knowledge of DSP is very limited but I base this idea on KK7B's binaural
receiver in the ARRL handbook.

73 de David VK5DG
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[NR5A]

I was getting a Hi Cur warning on my K2 tonite. Any helpful hints on what to
look for?? I fired my K2 up tonite on PSK and noticed its only putting about
3 watts out. Double checked it and its all modes, and all bands even tho the
power is set to 5 watts. RF leds only go to 3, usually goes to 5. It was
working just fine this afternoon (famous last words). I won't be able to do
any troubleshooting till tomorrow nite, was wonder where to start looking?

Jerry - NR5A - South Dakota

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