Key CW on ur RIG REMOTELY by pi, Carla, JackTrip, Recri Keyer, Zamgate, glame & a sinewave generator

[Chuck aa0hw]

pi2b is really too weak for this kind of work... however, pi2b is tested anyway to see how it would perform under the stress.

- a pi4b does quite well at this though, using the same setup....

once setup , CARLA is able to save not only all the APPs and their positions, but also the wires that connect everything together...         https://kx.studio/Applications:Carla

RECRI KEYER

https://github.com/recri/keyer

ZAMGATE

https://www.zamaudio.com/ 

JACKTRIP

https://ccrma.stanford.edu/software/jacktrip/

[Chuck aa0hw]

hERE IS THE PI4B doing much better using the same setup as above for keying CW remotely on the RIG

[Chuck aa0hw]

Key CW on ur RIG REMOTELY using a 4Khz VLF TESLA COIL TX antenna & a Raspberry pi VLF CW receiver

SETUP:

a rapsberry pi 4b is sending CW directly at 4Khz - outputs to a CLASS D audio amp...output of AMP goes to input of a bipolar tesla coil TX antenna with a large ferrite core... sends the 4Khz CW to another room in the house about 10 feet away to a pi2b, which has a smaller ferrite rod loopstick antenna connected to its usb mic adapter input.... the software has an AUDIO DERIVED CW KEYING SWITCH that takes the 4Khz signal and converts it to a 690hz CW signal that keys the RIG via AFCW mode... another tone is also sent to the RIG's line input, a PTT tone at 5555hz that's only purpose is to activate the RIG's TX VOX PTT circuit to get it into the TX MODE before the CW tone arrives to its line input... the RIG has an internal USB SOUND CARD that the pi2b is also using as its sound card

HERE IS A QRQ CW EXAMPLE of the same setup here:

[Chuck aa0hw]

Key CW on ur RIG REMOTELY using 2 pi SoundCard VLF SDRs - TX by remote OP, RX by RIG in another room

[Chuck aa0hw]

Key QRQ CW on your RIG's CW JACK using a 4Khz TESLA coil VLF transmitter & Raspberry Pi SDR Receiver

the pi sdr receiver/ferrite antenna, picks up the 4khz CW signal from the VLF TESLA COIL transmit antenna and sends it to an AUDIO DERIVED CW KEYING CIRCUIT ...see here for more info on the various circuits to use: https://qrqcwnet.ning.com/forum/topics/what-circuit-for-computer?

3 ALSA sounds cards are setup on the pi2b for this operation...

1. usb mic adapter that has a ferrite rod loopstick antenna connected to it, tuned to peak resonance by a CAP, to 4Khz...

2. the RIG's own internal USB SOUND CARD, which is also the Pi2b's usb sound card for taking the audio output from the RIG, and sending it to the remote laptop station in the other room over TCP/ip

3. the pi2b's own analogue headphone jack output that connects to the audio derived CW KEYING circuit to key the RIG's CW JACK

this GSTREAMER SCRIPT captures the 4Khz signal from the FERRITE ANTENNA connected to the USB MIC ADAPTER, filters it, amplifies it, and then sends it to the pi's HEADPHONE JACK

for connection to the audio derived CW KEYING circuit...which keys the RIG's CW JACK:

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gst-launch-1.0 -v alsasrc device=hw:2 ! queue ! audioconvert ! audiowsincband mode=band-pass lower-frequency=3900 upper-frequency=4100 length=128 window=3 low-latency=true ! audioconvert ! audioamplify amplification=12 ! alsasink device=hw:0 buffer-time=40000 sync=false async=false

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[Chuck aa0hw]

Key CW on your RIG's CW JACK with a VLF SDR transmitter\\receiver & 2 Ferrite Rod Loopstick antennas

2 raspberry pi's are used, one for 4Khz CW XMIT, the other for sending RIG audio back to the REMOTE OP

at the remote op's location is a RASPBERRY PI 4b CW KEYING setup... CW PADDLES, STRAIGHT KEY and KEYBOARD are used to send 4Khz VLF output out of the PI4's usb sound card's line output...to a class D audio amp...output of the class D audio amp goes to the input primary winding of a tesla coil transmit antenna, operating on the VLF band at 4Khz connected to the RIG's internal USB SOUND CARD is a pi2b, which only is used to send RIG audio back to the REMOTE OP over ip / LAN

by the RIG in the RIG ROOM is a RX ferrite rod loopstick antenna that is tuned to 4Khz for max signal strength...by adding a parallel CAP of the correct value to resonate at 4Khz.... output of the antenna goes to the input of another audio amp..... output of this audio amp goes to the input of an AUDIO DERIVED CW KEYING SWITCH circuit that KEYs the RIG's CW JACK

https://qrqcwnet.ning.com/forum/topics/what-circuit-for-computer?

NOTE: this Remote CW RiG KEYING setup operates at NEAR ZERO DELAY, very low latency