All Blog Posts Tagged 'qrqcw' (114)

resonant cw speaker test by placing a 45 degree, PVC ELBOW over a small speaker

NOTE: the audio you hear on this video is coming straight from the WEBCAM's MICROPHONE

brief demo of QRQ CW on the LF BAND @ 77.5Khz using soundcard SDR modules for both the TRANSMITTER and the RECEIVER from RECRI KEYER https://github.com/recri/keyer

FERRITE BOBBIN CORE HI-Q antenna 1.8mH, with about .002uF cap across the 2 ends of the core winding -…

follow up from the previous video where the iphone is sending cw...

https://youtu.be/9Hmk_AHes6Y

this time, the iPHONE is receiving CW over its own MUMBLE VOICE CHAT iphone APP - but instead of using wifi, the iphone is using The 5G NETWORK...

to test and see how well you can send and receive…

iCW example, to send CW with a QRQ CW Keyboard on the iCW Mumble Server

https://sites.google.com/site/icwoip/

concept - @8Khz was found to be a peak iPHONE MIC frequency pick-up from the EMF COIL by using an audio oscillator to test which frequency is…

FILTA LV2 PLUGINS - http://openavproductions.com/doc/artyfx.html

NOTE:  The delay from start to finish - going through 4 instances of FILTA LV2 cw audio filter modules, being connected in series, measured to be only 2.5…

brief rundown of using a large FERRITE CORE LOOPSTICK tuned ANTENNA to hook up directly to the sound card input...and then use some SDR software modules to get rid of HUM, NOISE, HISS and other EMF QRM from the house wiring emf'N into the RX antenna etc...

the ULF CW TRANSMITTER is a PI 4's audio output - going to a 30…

this is a follow up from the first video here - https://youtu.be/pfWvh82Qh20

in this video....QRQ CW is being transmitted out on the ULF band at 797 hz and at 75 wpm to a small horizontal wire loop antenna @ about 30 watts from an audio amp/4 to 1…

go to keyer.elf.org

uses a remote RASPBERRY PI 4 that hosts the LINUX CW KEYBOARD from AD5DZ - RECRI KEYER - https://github.com/recri/keyer using SSH -X on windows to bring up the PI4 CW KEYBOARD on the WINDOWS 10 DESKTOP (uses REALvnc to attach the connections from the CW KEYBOARD MIDI…

https://github.com/duggabe/gr-morse-code-gen

using the PATCH above... the first test of using the GNU RADIO CW KEYBOARD is done at a QRQ CW speed of 99 wpm... and GNU RADIO's modular SETUP for this CW KEYBOARD really did a great job - excellent sounding QRQ CW…

Jacktrip just came out with a new 1.2 version...it has been under heavy development recently... https://groups.google.com/forum/#!topic/jacktrip-users/8XahxQ92_XE…

sending a TEXT FILE at 60 wpm, from the REMOTE OP's PC, to a RASPBERRY PI 4 that is using the RIG's internal USB SOUND CARD as its own sound card....this test uses an RTSP SERVER:CLIENT audio over ip setup... the CW AUDIO you hear during this test is from the PI 4's TRANSMIT AUDIO MONITOR feed - going back to the REMOTE OP to get the PTT to…

using all AD5DZ SDR software MODULES to capture & demodulate a QRQ CW signal heard on the VLF BAND at 10101 Hz...this video also shows one special adjustment made to a RECRI KEYER FILTER file setting to create a custom CW AUDIO BANDPASS FILTER for QRQ CW RX copy

a VLF RX ANTENNA - tuned bi-coil ferrite rod - brings in the VLF SIGNAL…

brief demo of picking up a QRQ CW signal on the VLF BAND @ 12 Khz, using this VLF RX - bi-coil Ferrite Mass Antenna(FMA) - https://youtu.be/ZKVurZ2KzDA

in this demo, 2 specialized Gstreamer bandpass scripts are used:

1. one to match the VLF BANDWIDTH of QUISK SDR

2. another one to filter…

Experimental Morse Code QRQ CW setup over ip to send VLF RF CW at 17Khz using the OPUS AUDIO CODEC - to a remote TRANSMIT ANTENNA located at the other OP's QTH... the other OP receives the VLF TX RF using a small FERRITE BOBBIN CORE INDUCTOR COIL antenna hooked directly to their PC Mic or Line, soundcard input

the 17Khz CW TX/RX by the…

Brief experimental setup using the AD5DZ CW KEYER, to directly send 18.200 Khz CW AUDIO to a 20 watt audio amp...from the audio amp output to a large BLUE IRON POWDER TOROID 4 to 1 balun - then to the input of a compact 21 foot long DELTA LOOP wire antenna with one leg of the delta loop connected to a series resonant capacitor(6uF)

This 4 to…

this is a follow up video to the first one:

https://youtu.be/ON-tZWiCCPQ...

everything is the same in this video, except, this time we send QRQ CW at 80 wpm to test how it will sound over VLF and using SAQrx by itself - using its 300 hz wide bandpass filter - centered at 700 hz

and with…

Several Gstreamer scripts are used to perform REMOTE QRQ CW KEYING of a RIG(afcw mode) from the REMOTE OP's location using TCP audio over ip network packets through a router and network switches in the pathway(WIRED ETHERNET)

there are 2 Gstreamer BANDPASS filters applied before audio goes to rig for transmit:

1. 680 hz BPF Gstreamer…

Gstreamer has its own RTSP server::client scripts...

Gstreamer also has a way to interleave and deinterleave a 2 channel audio pipeline...in order to apply a different tone to each channel for transmit and then de-interleave them at the destination location and... just before going into the RIG's LINE INPUT For TRANSMIT, Gstreamer has…

this video demoS using GSTREAMER's audiointerleave and deinterleave plugins for a Gstreamer OPUS CODEC AUDIO OVER IP remote rig audio operations use...

CONCEPT:

break the 2 channel audio over ip pipelines into 2 individual pathways that can contain their own individual Gstreamer audio DSP plugins...

in this case....2 different…