Hans Summers

P.S. Correction to the link I typed wrongly: the VFO page is on

73 Hans G0UPL

On Sun, Jul 16, 2017 at 8:40 AM, Hans Summers <hans.summers@...> wrote:
A small correction...

The Tayloe Detector (a.k.a. Quadrature Sampling Detector) uses a 2-phase clock AT the operating frequency. Not at 4x The operating frequency. 

An oscillator signal at 4x the operating frequency is often used to generate the correct 90-degree phase offset 2nd phase clock signal. For example the QRP Labs receiver module 

It is also possible to use an oscillator like the Si5351A synthesizer chip, which has multiple outputs. You can configure two of these outputs to be at the operating frequency with a 90-degree phase offset between them. See

73 Hans G0UPL 

On Jul 15, 2017 23:04, "Bob Macklin" <macklinbob@...> wrote:
You might be better off to start with a Softrock Ensemble kit. Or buy an assembled Softrock Ensemble. Then learn how to make it work with available software.
The Tyloe Detector works on a 2 phase clock operating at 4 times the frequency.
There is also a Softrock Yahoo group.
Bob Macklin
Seattle, Wa.
"Real Radios Glow In The Dark"
----- Original Message -----
Sent: Saturday, July 15, 2017 9:50 AM

Thank you for letting me join QRPLabs.  I would like to learn more about the Tayloe detector.  I have done some reading on the Tayloe detector, but there are some things that I don't understand fully.  I am having trouble with how the detector captures the 0, 90, 180, 270 degree segments of the input signal at 4 times the frequency.  My guess is that I need to review RC time constants. 

I originally wanted to build my own Tayloe detector using discrete parts in order to see how it works.  I found the QRPLabs website and found the information on the SDR receiver module and the VFO Signal Generator.  I think that I would have better results with the kits rather than building my own Tayloe detector.  I would appreciate any advice from the QRPLabs members. 

I hope to understand IQ modulation works with both transmitting and receiving and explain the principles of IQ modulation in an intuitive way to members of my Amateur Radio club. 

Thank you,

Richard Phillips

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