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Binaural and phasing SSB receiver experiments

The maths can be hard to understand but there is a certain beauty about the way that phasing (as opposed to filter) method single signal SSB receivers work. And the experience of listening to a binaural receiver can be pretty amazing as well, giving an audio sensation few hams encounter.

Here I start with a binaural direct conversion recever and then add parts to allow single signal reception as a phasing receiver.


Binaural direct conversion receiver

Describing a simple binaural receiver. Note that the effect is not audible in the video as the audio is only mono.


A phasing direct conversion SSB receiver

Here I modify the above binaural receiver to allow single signal reception.
The receiver requires its VFO to be four times the receive frequency (described next).


DDS VFO for the above

Describing an Arduino-controlled DDS VFO for the above receiver.


Almost all discrete component phasing direct conversion receiver

A very simple receiver derived from two QRSS designs by PA2OHH. Whereas PA2OHH used an IF of roughly 10 or 20 kHz for feeding into a computer, I changed the audio phase shift network to do all that at around 1kHz. The very simple audio phase shift network has maximum audio image rejection at just one frequency but the effect is still worthwhile, especially for CW reception. If you want to experiment with this approach I suggest starting with the 2020 3.5 and 7 MHz designs on PA2OHH's website.


Further information

See elsewhere on my website for description of another type of phasing receiver,
how it became a transceiver and links to many old and new resources on phasing SSB techniques.



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(c) Peter Parker VK3YE 1997 - 2020.

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