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SSB Transmission - Filter Method, Phase Shift ... - D&E Notes
https://www.daenotes.com/electronics/communication-system/ssb-transmission#:~:text=SSB%20Single%20Sideband%20Transmission%20Phase%20Shift%20Method%20It,balanced%20modulator%20along%20with%20the%20audio%20modulating%20signal.
Phasing_SSB_Transmitter
https://www.n6qwradiogenius.us/Phasing_SSB.html
Below is a typical 1950's style Phasing Transmitter with the 90 Degree Audio Phase Shift Network typically being deisgnated as the 2Q4. The theory of phasing generation of SSB signals involves mathematical relationships that take advantage of phase differences in signals to cancel the carrier, diminish one sideband and to embellish the other.
SSB Transmission - Filter Method, Phase Shift ... - D&E …
https://www.daenotes.com/electronics/communication-system/ssb-transmission
The phaseing method of SSB generation uses a phase shift technique that causes one of the side bands to be conceled out. A block diagram of a phasing type SSB generator is shown in fig. SSB Single Sideband Transmission Phase Shift Method It uses two balanced modulators instead of one. The balanced modulators effectively eliminate the carrier.
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.
Audio phase-shift network - Red Wave Radio
http://www.redwaveradio.com/5_6a4babd21e577105_1.htm
Hi, Anyone have the basic circuitry for an audio phase-shift network for use in a phasing type SSB e***r. What I am interested in is the old B&W Model 350 2Q4. I have the circuits for the modern phase-shift networks, but I have never seen the layout for the older (1950's) networks. The 2Q4 has been
W4NEQ SSB audio
http://w4neq.com/htm/hamaudio.htm
Dynamic processing for ssb and fm will be more exacting and efficient with improved symmetry - that's why virtually all modern broadcast audio processors use some means of phase-rotation. The technique imparts variable phase shift across the audio passband, particularly in the bass-midrange region - about 500-700 Hertz.
I and Q Phasing - QSL.net
https://www.qsl.net/zl1wtt/I&Q.htm
For SSB one of the inputs is shifted by 90 degrees compared to the other. Over a frequency range of 300 Hz to 3 kHz, this is done with in a polyphase network. Most software programs take an IF approach. The IF frequency is normally adjustable around the centre frequency of 12 kHz.
Challenges of SSB: the development of the QSX all-mode HF ...
https://www.qrp-labs.com/images/news/dayton2019/FDIM2019ConfProceedings.pdf
frequency range over which the 90-degree phase shift is accurately maintained need not be large since CW is received at 700Hz audio with a ~200Hz wide filter. However, in an SSB receiver, the 90-degree phase shift needs to be accurate over a much wider range, for example 300-3000Hz. To do this with the “active all-pass” network requires a larger
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