+++++++++++++++++++++
Date: Tue, 12 Mar 2002 08:10:14 -0500
From: David Hinerman <WD8CIV at worldnet.att.net>
To: qrp-l at lehigh.edu
Subject: [121895] Re: Binaural Receiver

At 07:24 PM 3/11/2002 -0700, you wrote:
> > It seems to me a Tayloe detector would be ideal for a binaral receiver.
> > Anybody tried it?
>
>I've heard good things about Tayloe's detector. But I haven't seen this
>circuit ...is it public?

Steve,

I just found out Dan Tayloe has been granted a patent for it (#6,230,000 - 
look it up at http://patft.uspto.gov/netahtml/srchnum.htm) but it's been 
talked about here, and in an e-mail I got from Dan he said it was okay to 
experiment with it. The online patent has figures that show the basic 
circuit pretty well.

Here's a link to some info on it from Dan:

http://www.extremezone.com/~nk7m/tayloe.htm

It requires a VFO that is 4x the operating frequency, but it sounds like it 
gives good performance for its simplicity. Dan used a high-speed 1-of-4 
analog multiplexer and a fast 2-bit counter to select among the 4 channels. 
I've done some experiments with a similar circuit but using a much slower 
chip (74HC4053), and it seems like it'll work for maybe 80 meters or below. 
(Maybe)

While Dan's design included the audio phase shift and summing circuits to 
make a single-signal receiver, it should be possible to omit those and 
simply feed the two audio signals to matching amplifiers.

Here's a similar detector circuit - it's connected backwards, so to speak, 
but it still gives the I and Q audio signals:

http://ham.te.hik.se/~sm5bsz/linuxdsp/iqmixer.htm

This is from the Web page for LINRAD, a software radio for Linux that 
samples I and Q audio with a sound card and combines it to make a 
single-signal receiver. There's another, much more elaborate detector at:

http://ham.te.hik.se/~sm5bsz/linuxdsp/rxiq/mixer.htm

The author claims this one has "extreme dynamic range." For the parts 
count, it better. (Grin)

Dave

++++++++++++++++++
Date: Tue, 12 Mar 2002 08:27:01 -0500
From: thomasr2 at gdls.com
To: leatham1 at juno.com, qrp-l at Lehigh.EDU
Subject: [121896] Re: Binaural Receiver
Message-ID: <OFA798FED3.1EB33E07-ON85256B7A.00499177 at gdls.com>
MIME-Version: 1.0
Content-type: text/plain; charset=us-ascii


If you want to listen to binaural CW quickly, without having to build your
own receiver, pick up a Timewave DSP-599zx with version 5.0 software.  It
has this feature and another neat DSP trick called "CW spotlight."  I have
one that I use on my Century 21 and the binaural CW works great!

73,

Ron  N4RT

+++++++++++++++++++