May 2020 Blog Posts (6)

Raspberry Pi 4 - remote QRQ CW Keyboard using the AD5DZ recri keyer APPs + ZitaNJbridge

zitaNJbridge provides the near zero latency audio over ip link between the RIG/pi4 interface and the remote OP's desktop https://kokkinizita.linuxaudio.org/linuxaudio/

recri keyer's CW Keyer APPs used from :…

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Added by Chuck aa0hw on May 31, 2020 at 2:04pm — No Comments

Using the LOXJIE A10 60 Watt Class-D Audio Amplifier as an 88Khz LF Band QRQ CW Transmitter AMP

this is a follow video to this one in this series:

https://youtu.be/YCJpS0kCbQ0the PC's native MOBO sound card was set to 192Khz to enable direct 88Khz CW TRANSMIT from the AD5DZ CW KEYBOARD sending a text file

the LF RF 88Khz output of the PC's sound card goes to the input of the LOXJIE A10…

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Added by Chuck aa0hw on May 22, 2020 at 1:43pm — No Comments

QRQ CW test - send CW at 96 Khz on the LF band at 96 wpm and send it to another OP over IP

brief experiment to see if by using the maximum sample rate of a sound card, 192Khz, would allow sending QRQ CW at 96 Khz(the highest frequency possible at 192Khz sample rate) at 96 wpm

Gstreamer scripts are used by the TRANSMITTER and RECEIVER

- TCP CW LF RF over IP -

TRANSMITTER:

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

gst-launch-1.0 -v…

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Added by Chuck aa0hw on May 17, 2020 at 6:58am — No Comments

QRQ CW OPs - minimize CW ELEMENT spectrum splatter when transmitting QRQ CW on your RIG - with this:

1. send AFCW MODE

2. use this GSTREAMER BANDPASS FILTER between your CW KEYER's audio output and the RIG's LINE INPUT

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

gst-launch-1.0 jackaudiosrc ! queue ! audioconvert ! audiowsincband mode=band-pass lower-frequency=600 upper-frequency=800 length=700…

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Added by Chuck aa0hw on May 16, 2020 at 7:43am — No Comments

experimental QRQ CW TRANSMIT FILTER to achieve a very narrow RF bandwidth on QRQ CW TRANSMIT - VLF BAND TEST

VLF BAND TEST on 10101 Hz

20 watt VLF AMP to compact DELTA LOOP ANTENNA

received by a Ferrite rod RX VLF antenna connected directly to this recording laptop's MIC INPUT jack, demodulated from VLF into CW AUDIO by the AD5DZ SDR APPs: LO-MIXER & FILTER modules



CW TRANSMIT VLF RF Gstreamer BANDPASS FILTER script…

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Added by Chuck aa0hw on May 9, 2020 at 4:40pm — No Comments

The AD5DZ MODULAR SDR software - demo of the AD5DZ SDR modules used to receive a VLF band QRQ CW signal

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…

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Added by Chuck aa0hw on May 3, 2020 at 2:30pm — No Comments

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