December 2021 Blog Posts (11)

Gstreamer provides the TCP/ip audio over ip streams to and from the RIG's connected interfaced Pi2b and the remote OP's PC https://gstreamer.freedesktop.org/download/ here are the scripts used on the PI2B, the laptop's scripts would be the same with the…

using different configurations of PVC PIPE(2 INCH Diam) to create a device that will be resonant, increase volume & the sound stage area, and just sit on top of one small speaker, (a radio shack communications speaker)

experimental BiPolar Tesla Coil with a large massive ferrite core, that resonates at 30Khz, to act as a CW transmitter antenna...

CW is sent from a CW KEYBOARD that can send directly at 30Khz, goes out of a sound card that has a sample rate of at least 96Khz...the 30Khz CW output goes to the audio input of a cheap class D…

ZAMGATE PLUGIN INFO HERE:

http://www.zamaudio.com/?p=976

SQUARE WAVE to SINE WAVE by a 3 stage CW AUDIO BANDPASS FILTER setup using 3 sets of tuned ferrite rods,  tuned similar in the way that an antique crystal wireless set would be tuned at the antenna stage, the passive bandpass filter middle stage, and the 3rd filter going to the 1st stage of detection...

GO FROM THIS:…

USES TWO CLi Terminal command line APPs

1. chucK programming language for the CW Keyer, and CW Keyboard

https://chuck.cs.princeton.edu/…

see previous video for this telecoil transmitter for more info in the 1st video description notes https://youtu.be/L1OmVx4mxU8

uses 2 ferrite bobbin core inductor [telecoil transmitter] coils... something like one of these from:…

HAMFEST HELMET PORTABLE VLF RF CW COMMUNICATOR PROTOTYPE - FERRITE ROD LOOPSTick VLF RF 3.8Khz Vertical Transmit Antenna - powered by a portable 12 Volt Class D amp. (ferrite rod = 7 inch long & 1/2 inch diameter TUNED to series resonance at the VLF RF frequency of interest by the appropriate CAPACITOR)

A simple…

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

https://github.com/billythehippo/vban-1 (this open source VBAN project has Jack Audio Connection Kit support)

BRIEF demo of someone sending 14.4Khz QRQ CW VLF RF over IP to a Remote RASPBERRY PI 4 and the Pi-4 RE-Transmits the incoming signal over to an indoor VLF Transmit antenna... a local VLF soundcard SDR Receiver Antenna picks up the signal from the PI 4 RE-Transmitter and mixes the 14.4Khz down to 780 hz QRQ CW Morse Code audio tones…