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An Introduction to PSK31
https://mtnarc.org/index_htm_files/PSK31%20intro.pdf
zPSK31 is a digital mode ideally suited for use in the HF bands. zThe “PSK” means Phase Shift Keying. z“31” means 31.5 baud. zPSK31 rivals the weak-signal performance of CW, and is a vast improvement over RTTY. The bandwidth of a proper PSK31 signal is only 31 Hz – narrower than the average CW signal!!!
PSK31 - Wikipedia
https://wiki-mirror.cla.umn.edu/wiki/PSK31
PSK31's symbol rate of 31.25 Hz was chosen because a normal typing speed of about 50 words per minute requires a bit rate of about 32 bits per second, and specifically because 31.25 Hz could easily be derived from the 8 kHz sample rate used in many DSP systems, including those used in the computer sound cards commonly used for PSK31 operation (31.25 Hz is 8 kHz divided by …
PSK31 Setup and Operation - bpsk31.com
https://bpsk31.com/operation/
Next, tune your radio to a common PSK31 frequency; two are 7.070 MHz and 14.070 MHz (see a full list of frequencies below). Make sure your radio is set to SSB mode on the upper sideband (USB). Your will not have to change frequencies after that, since PSK31 signals are so narrow (31 Hz), all the transmissions will be picked up by the receiver without changing frequencies.
WM2U's PSK31 Page - QSL.net
https://qsl.net/wm2u/psk31.html
All audio levels are equalized when running either the computer, the SSTV program or PSK31. To adjust this circuit, tune to a strong carrier and adjust the Rig Volume until the red overload lines disappear. At this point simply tweak RV1 to give the required output power from the transmitter.
lpsk31 Manual - QSL.net
https://www.qsl.net/5b4az/pkg/psk31/lpsk31/lpsk31.html
For PSK31 transmission, the DSP output level needs to be set up for minimum distortion in the transmitter. The Volume/PCM level setting in ~/lpsk31/lpsk31rc can be edited to adjust the audio output level but if the setting needs to be below approximately 20% then a simple resistive attenuator will be needed ahead of the transmitter's audio input.
Setting up for PSK31 and other digi modes Question. | QRZ ...
https://forums.qrz.com/index.php?threads/setting-up-for-psk31-and-other-digi-modes-question.317712/
These same sources say audio output level should commonly be between 1/4 and 3/4. Well this is where my confusion is. To get my power down on PSK31 to 25 watts I have to set the audio output level to 1-3 (almost non-existent) along with the mic gain turned to 10-15% at the most (which I thought could remain around normal levels, about 50-60% for me).
PSK31 Operations - c2.com
http://c2.com/~ward/morse/psk31/
I use the very simple interface described in the help file of my psk31 program. Here is what it says ... Connect a shielded audio cable between the transceiver MIC input and the sound card LINE OUT jack through a 40 db attenuator, consisting of a …
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https://peer.asee.org/a-psk31-audio-beacon-project-provides-a-laboratory-capstone-design-experience-in-digital-communications.pdf
PSK31 Audio Beacon via an RS232 interface. The Audio Beacon features PSK31 encoding and audio waveform generation using a single-chip SX28 RISC microcontroller operat ing at 50 MHz. The beacon has a choice of three base carrier audio …
Phase Shift Keying (PSK) Radio - Larkfield
http://www.larkfield.org/pdf/psk31.pdf
crowded digital band. PSK31 operates in a much narrower bandwidth than FSK (Frequency Shift Keying). PSK63 is a variation of PSK31. It has a bandwidth of 63 Hz. and a speed of 100 wpm. RTTY has a speed of 60 wpm. PSK63 has improved polar path performance over PSK31. The difference between a CW filter of 500 Hz and the bandwidth of PSK31 of 31 Hz
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