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W6REK QRSS DTCW

Transmitting from San Jose, Calif (CM97ah): W6REK

Thanks to VE1VDM, ZL2IK, W4HBK, and WA5DJJ for the spectrum grabs.

Grabbed in Nova Scotia by VE1VDM on 30 meter:

Grabbed in New Mexico, USA:

Grabbed in New Zealand by ZL2IK:

My attempt to enhance the signal in that previous image:

Nested (fractal) DTCW:

the inner DTCW with 5 Hz deviation takes under 3 minutes, and is reused multiple times to create the outer DTCW, with 15 Hz deviation, that transmits in about an hour.

Here's the relevant part of that image:

Barely making it to Greensboro NC on 30m:

  • 
    pi@raspberrypi:~ $ cat -n /usr/local/bin/with-gpio-22.py
         1        import gpiozero, os, sys
         2
         3        # Transmit gpio pin 22 is Active Low for Transmit.
         4        rx = gpiozero.LED(22)
         5
         6        def Transmit():
         7          rx.off()
         8
         9        def Receive():
        10          rx.on()
        11
        12        if len(sys.argv) != 2:
        13          raise Exception('Bad len(sys.argv): %d' % len(sys.argv))
        14
        15        try:
        16                Transmit()
        17                os.system(sys.argv[1])
        18        finally:
        19                Receive()
    pi@raspberrypi:~ $
    
    

    W6REK/4 transmitting from Edgefield County South Carolina

    pi@raspberrypi:~ $ cat -n qrss-slashup-sept2018.sh
         1        #!/bin/bash
         2        set -x
         3
         4        function rig() {
         5          rigctl -m 313 -s 9600 -r /dev/serial/by-id/usb-FTDI* "$@"
         6        }
         7
         8        while date
         9        do
        10            set +x
        11            echo WAITING FOR 9/2/5 -- $(date)
        12            while sleep 0.1; do
        13              case $(date +%M) in
        14                *9 | *2 | *5 ) break ;;
        15              esac
        16            done
        17            echo GOT 9/2/5, WAITING FOR 0/3/6 -- $(date)
        18            while sleep 0.1; do
        19              case $(date +%M) in
        20                *0 | *3 | *6 ) break ;;
        21              esac
        22            done
        23            echo GOT IT -- $(date)
        24
        25            case $(date +%M) in
        26              *0 )  F=7038770 ;;
        27              *3 ) F=10138970 ;;
        28              *6 )  F=14095770 ;;
        29              *  )  continue ;;
        30            esac
        31
        32            set -x
        33            rig M USB 2800
        34            sleep 0.2
        35            rig L RFPOWER 0.02
        36            sleep 0.2
        37            rig F $F
        38            sleep 0.2
        39            [ $F = $(rig f) ]
        40
        41            python2 /usr/local/bin/with-gpio-22.py 'set -x;
        42              GOMAXPROCS=1 /usr/local/bin/qrss -gain=0.10 -mode=slashup -secs=8.5 -ramp=1.0 -rate=48000 -base=1000 -base_rand=0 -step=4' |
        43            pacat --format=s16be --channels=1 --channel-map=mono  --rate=48000 \
        44              --device=alsa_output.usb-C-Media_Electronics_Inc._USB_Audio_Device-00-Device.analog-stereo
        45        done
    pi@raspberrypi:~ $
    
    2018-09-18:
    
    pi@raspberrypi:~ $ cat -n qrss-slashup-sept2018.sh.3
         1        #!/bin/bash
         2        set -x
         3
         4        function rig() {
         5          rigctl -m 313 -s 9600 -r /dev/serial/by-id/usb-FTDI* "$@"
         6        }
         7
         8        while date
         9        do
        10            set +x
        11            echo WAITING FOR 9/2/5 -- $(date)
        12            while sleep 0.1; do
        13              case $(date +%M) in
        14                *9 | *2 | *5 ) break ;;
        15              esac
        16            done
        17            echo GOT 9/2/5, WAITING FOR 0/3/6 -- $(date)
        18            while sleep 0.1; do
        19              case $(date +%M/%S) in
        20                *0/1? | *3/1? | *6/1? ) break ;;
        21              esac
        22            done
        23            echo GOT IT -- $(date)
        24
        25            case $(date +%M) in
        26              *0 )  F=7038770 ;;
        27              *3 ) F=10138970 ;;
        28              *6 )  F=14095770 ;;
        29              *  )  continue ;;
        30            esac
        31
        32            set -x
        33            rig M USB 2800
        34            sleep 0.2
        35            rig L RFPOWER 0.01
        36            sleep 0.2
        37            rig F $F
        38            sleep 0.2
        39            [ $F = $(rig f) ]
        40
        41            case $(date -u +%d) in
        42             02 | 03 | 05 | 07 | 11 | 13 | 17 | 19 | 23 | 29 | 31 )
        43               python2 /usr/local/bin/with-gpio-22.py 'set -x;
        44                 GOMAXPROCS=1 /usr/local/bin/qrss -gain=0.10 -mode=duo -secs=3.9 -ramp=0.1 -rate=48000 -base=1000 -base_rand=0 -step=3'
        45               ;;
        46             * )
        47               python2 /usr/local/bin/with-gpio-22.py 'set -x;
        48                 GOMAXPROCS=1 /usr/local/bin/qrss -gain=0.10 -mode=slashup -secs=8.5 -ramp=1.0 -rate=48000 -base=1000 -base_rand=0 -step=4'
        49               ;;
        50            esac |
        51            pacat --format=s16be --channels=1 --channel-map=mono  --rate=48000 \
        52              --device=alsa_output.usb-C-Media_Electronics_Inc._USB_Audio_Device-00-Device.analog-stereo
        53        done
        54
        55        # GOMAXPROCS=1 /usr/local/bin/qrss -gain=0.10 -mode=slashup -secs=8.5 -ramp=1.0 -rate=48000 -base=1000 -base_rand=0 -step=4' |
        56        # GOMAXPROCS=1 /usr/local/bin/qrss -gain=0.10 -mode=duo -secs=4.0 -ramp=0.2 -rate=48000 -base=1000 -base_rand=0 -step=3' |
    
    
    
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