форум Радиолюбительского ДВ портала > Технический раздел
QRSS Keyer и частные вопросы синтезаторостроения. Arduino. Rapsberry pi.
rw3adb:
> QRSS-30 will be possible?
Of course!
We are building the CW/QRSS/DFCW keyer with Arduino.
And the exiter should be QRG oven stabilized, long term drift about 2*10^-8
The 475 kHz generator should be a PLL synthetizer with an external BCD coded
connector programming frequency.
http://www.k7jrl.com/pub/manuals/adret/cs201/
73 de Claudio IK2PII
rw3adb:
до кучи, на тему.
http://www.hanssummers.com/ultimate3.html
rw3adb:
мда, 3.5 года прошло до начала попыток использования сего:
LF: TXing WSPR on 630m on a Raspberry Pi, Stefan in QRPPPP...
Hi MF,
Today i've got i 3rd Raspberry Pi. I quickly installed the WSPR softaware and since a few minutes i am transmitting WSPR-2 on 630m, my usual frequency 475.685 kHz.
I'm directly using the GPIO output pin, without an amp stage behind! The rectangular 3.3V output voltage is passing a cap and an isolation transformer (FT50-77) as well as a simple pi-filter, because it is a Raspberry pi! ;-)
See: https://dl.dropboxusercontent.com/u/19882028/MF/Raspberry%20Pi%20B%2B%20WSPR%20TX.jpg
I measured an output power of about 10 mW at 50 Ohm. It is now connected to my MF antenna and transmits in a 100% duty cycle. I still have to learn how to reduce it but this will not take long.
With 10 mW TX power i managed decodes by 3 stations now.
3 spots:
Timestamp Call MHz SNR Drift Grid Pwr Reporter RGrid km az
2015-03-18 20:32 DK7FC 0.475684 -21 0 JN49ik 0.01 DH5RAE JN68qv 345 98
2015-03-18 20:12 DK7FC 0.475685 -24 0 JN49ik 0.01 F1AFJ JN06ht 667 247
2015-03-18 20:06 DK7FC 0.475683 -27 0 JN49ik 0.01 DL1DBC JO41bi 217 349
Does someone have good ears to get a decode from me? :-) It is a challenge! :-)
73, Stefan/DK7FC
PS: The signal is so weak that my RX antenna frontend is not overloaded, so at that power level i can transmit and receive to the same time :-)
PPS: A small amp stage will follow soon, i intend to use an BS170 running at 5 V.
rw3adb:
да, на всякий случай, малоль кто-то не в курсе.
выпустили, оказывается, такую приблуду к малине:
http://www.suptronics.com/Xseries/x300.html
нормальная звуковуха на борту... ну-с, сеньоры линуксоиды, ау!
rw3adb:
случайно набрёл, может кому из наших будет полезно.
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