Audio Quadrature Phase Shift Network

Audio I/Q phasing networks, which is better? | Forum for ...

https://www.edaboard.com/threads/audio-i-q-phasing-networks-which-is-better.354456/#:~:text=The%20transformers%20are%20simply%20there%20to%20split%20the,side%20of%20it%20the%20shift%20starts%20to%20vary.

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Audio Polyphase Quadrature Phase Shift Network - QRZ Forums

https://forums.qrz.com/index.php?threads/audio-polyphase-quadrature-phase-shift-network.228425/

9H1FQ Ham Member QRZ Page. Hi all, We have lots of resources and circuit ideas about the polyphase quadrature audio phase shift network, like HA5WH, Weaver, Gingell Tayloe etc. But which is the ideal ? Which is the one that gives the best sideband rejection ? Which is the most used ? Like to hear from anyone who has built one. 9H1FQ, Dec 8, 2009.

Top 7 Ways to Create a Quadrature (90˚) Phase Shift ...

https://www.markimicrowave.com/blog/top-7-ways-to-create-a-quadrature-90-phase-shift/

This is the gold standard for quadrature signal generation. It can operate across a broad bandwidth (2 to 26 GHz for example), it has excellent balance in both amplitude and phase, and it can be used on the data side of an image reject or single sideband mixer to get better than 20 dB rejection. These are generally built in a tri-plate stripline construction, which has the …

Phasing Quadrature Amplification - Radio World

https://www.radioworld.com/tech-and-gear/phasing-quadrature-amplification

Audio phase-shift network - Red Wave Radio

http://www.redwaveradio.com/5_6a4babd21e577105_1.htm

Audio phase-shift network. by Joe McElvenne » Sun, 13 Apr 2003 21:09:29. Hi, Pin 1 - 2 : 680pF in series with 487k. Pin 2 - 3 : 430pF in parallel with 770k. Pin 5 - 6 : 680pF in series with 125k. Pin 6 - 7 : 430pF in parallel with 198k. Inputs across 1/5 and 3/7 with the quadrature outputs from 2. and 6.

A Wideband Precision Quadrature Phase Shifter

https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=3772&context=etd

precise quadrature phase shift with constant amplitude response in order to achieve a high image rejection ratio (IRR). An RC-CR lter is a popular method of performing the phase shift over a small bandwidth. RC-CR lters have a phase shift of 90 at all frequencies, but can only achieve reasonably constant amplitude response over a narrow bandwidth.

Audio I/Q phasing networks, which is better? | Forum for ...

https://www.edaboard.com/threads/audio-i-q-phasing-networks-which-is-better.354456/

The RC networks produce quadrature output from those two phases. In a simple RC network, the phase shifts are 90 degrees at one frequency and at each side of it the shift starts to vary. In the polyphase network the 90 degrees is accurate at several frequencies in the passband so the variation is smaller and better distributed.

Polyphase network kit PCB Rev 2 - QRP Labs

http://www.qrp-labs.com/images/polyphase/polyphase2a.pdf

This polyphase network module is designed to be used with the QRP Labs receiver module kit. It takes as inputs, four phase audio from the Quadrature Sampling Detector (QSD) on the receiver board. The inputs are fed into a 4-column phase shift network. The output is single-sideband audio. Construction is reasonably straightforward.

Polyphase network kit

http://www.qrp-labs.com/images/polyphase/polyphase.pdf

This polyphase network module is designed to be used with the QRP Labs receiver module kit. It takes as inputs, four phase audio from the Quadrature Sampling Detector (QSD) on the receiver board. The inputs are fed into a 4-column phase shift network. The output is single-sideband audio. Construction is reasonably straightforward.

vk3ye dot com - Phasing SSB experiments

https://vk3ye.com/projects/projssbphasing.htm

The audio transformer used after the audio phase shift circuitry isn't critical. I've had success with either a 3k to 3k, 2k to 10k or 1k to 8 ohm. Selectivity isn't brilliant but is better than a direct conversion receiver that has no audio image suppression. You will be able to hear SSB signals 5 kHz apart and mostly separate them.