All Blog Posts Tagged 'qrqcw' (114)

https://github.com/gordonjcp/lysdr

i/q encoding of CW Signals from -3kHZ to -30kHZ & +3kHZ to +30kHZ was done with 12 CW KEYBOARD from RECRI KEYER…

http://www.4sqrp.com/hipermite.php

to reduce the unwanted harmonics & QRQ CW edge noise generated by a keyed TWIN-T's CW audio output...the HI-PER-MITE active audio cw filter is tested to see how well it cleans it up

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this setup uses the following hardware:

1. raspberry pi 4

2. TLC555 that is keyed by a CW KEYER's RIG KEYING jack...(the TLC555 is powered by the PI's own 3.3v power supply via its GPiO pins

3. usb sound card with LINE INPUT - this demo uses a Behringer UCA222 the keyed 555's audio…

this video is a follow up to the first video here: https://youtu.be/RQh_4JW6adw

this video adds a CW KEYBOARD, and straight key to the Raspberry PI 4 iambic CW keyer shown in the first video... by using a 2nd keyed CPO at a different PITCH than the 1st keyed CPO in…

TLC555 timer chip square wave oscillator is being 'keyed' (pin 4/pos rail) by a CW KEYER & its iambic paddles AND also being keyed by FLdigi using FLdigi's serial port keying setup via a usb serial port adapter and keying the serial port's RTS PIN Both the CW KEYER and FLDIGI are keying the diode side of an H11F1 FET OPTOisolator chip and…

the Gstreamer Script used in this video example:

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gst-launch-1.0 -v alsasrc device=hw:4 ! "audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)48000, channels=(int)2, channel-mask=(bitmask)0x0000000000000003" ! tee name=t !…

SDR RECEIVER built from RECRI KEYER's SDR MODULES: https://github.com/recri/keyer

several common CW Transmit/RX issues show up on iCW

1. keyclicks/square wave on OP's signal

2. CW pitch/keying too soft on OP's…

using the dummy sound card JACK set to 800Khz, a Raspberry PI 4 transmitter sends LongWave CW to a laptop receiver over ip using these Gstreamer scripts:

/Pi4 TRANSMITTER:\

qrq@pi4b:~ $

gst-launch-1.0 -v jackaudiosrc ! "audio/x-raw, channels=1" ! audioconvert ! rtpL24pay ! udpsink…

FLdigi is keying a TLC555's pin 4/POS rail to send out a square wave CW NOTE at 1850 hertz - goes to a PI4 usb sound card's LINE INPUT...goes to a HILBERT CELL, then a BANDPASS FILTER(centered at 1850hz) then to a GAIN MODULE(+3db) then to an LO-MIXER that allows you to choose ANY CW PITCH and still keep the bandpass audio filtering bandwidth…

this video demo's a RASPBERRY PI 4, SETUP as a high performance morse code practice oscillator using RECRI KEYER CW modules

https://github.com/recri/keyer

TEENSY-LC usb midi board with recri midi-keys embed firmware…

RECRI KEYER sdr modules from AD5DZ:

https://github.com/recri/keyer

SETUP:

a square wave from a TCL555 655 hertz oscillator is being keyed by FLdidi's serial port RTS PIN feature.... the 655hz SQUARE WAVE goes to the input of the sound…

testing out CARLA's plugin host, using an alsa USB sound card directly, on a Raspberry PI 4...also testing CARLA's experimental feature, 'ADD JACK APPLICATION' to include MUMBLE and a RECRI KEYER CW AUDIO BANDPASS FILTER into the CARLA CONNECTION BAY

FLdigi is keying a 555 square wave oscillator and sending into the PI's…

DEMO OF FLdigi QRQ CW sending at 80 wpm, using its SERIAL PORT RTS pin keying feature, keys an H11F1 fet opto isolator which keys a 555's (pin 4/pos) which sends its output square wave at @2600 hertz to the MIC INPUT of a laptop...which sends that 2600 555 square wave to the input of an AUDIO to MIDI app called TRIGGER MIDI MONO(TMM) TRIGGER…

KXstudio's CARLA

https://kx.studio/Applications:Carla

CARLA allows you to add a Gstreamer script in its JACK APPLICATION feature...then once the script is loaded, you can export the Gstreamer script as an LV2 plugin on Carla's RACK where it shows…

USES a RADIO SHACK 3 way speaker crossover(woofer/BASS) that has added un-polarized electrolytic CAPs - to 'tune' it to peak signal at 700 hertz

REALISTIC 3-WAY UNIVERSAL CROSSOVER 40-1299…

when using FLdigi 's serial port KEYING function....it seems to change whatever the CW PITCH was before, and move it up to 1500 hertz... to get it back to a desired PITCH 3 plugins are used to RE-CREATE the FLdigi CW audio note output...

SINE WAVE GENERATOR

ZAMGATE (in sidechain…

CALF STUDIO GEAR

https://calf-studio-gear.org/

ZAMGATE

https://www.zamaudio.com/

setup

FLdigi is keying the PI 4's usb serial port's RTS PINs the RTS pin is…

GSTREAMER SCRIPT used in this example on the PI 4:

*******************************************************

pi@raspberrypi:~ $ gst-launch-1.0 -v alsasrc device=hw:3 ! "audio/x-raw, layout=(string)interleaved, rate=(int)48000, format=(string)S16LE, channels=(int)2,…

CARLA

https://kx.studio/Applications:Carla

SETUP: A FET H11F1 OPTOisolator is being 'keyed' by the serial RTS PIN from FLdigi's CW KEYBOARD... the output of a 555 square wave oscillator is running continuously and attached to the output pins of…

This Gstreamer Script has the internal BandPass Filter used by the PI to take the QRQ CW SQUARE WAVE notes(@84wpm) from a 555 timer chip CPO's audio output, that is being keyed by a CW KEYBOARD, with the 555 output going to the PI's usb mic jack input...this Gstreamer Script filters out all of the harmonics AND puts a raised cosine edge on it…