MUFFIN2 was piggybacked on SERVET III, a heavy balloon sended by Ibercivis in 2018 the Saturday 14th of July at 0930 UTC.
Frequency 433.882Mhz. 25mW.
The CW was sended at 24 WPM.
MUFFIN2 the first Satellite Prototype launched.
MUFFIN2 was piggybacked on SERVET III, a heavy balloon sended by Ibercivis in 2018 the Saturday 14th of July at 0930 UTC.
Frequency 433.882Mhz. 25mW.
The CW was sended at 24 WPM.
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An ATtiny of Atmel running at 1 Mhz is our controller. Using a square wave of 800 Hz and a 80 ms dot sending a CW message.
The sound sended is a 800Hz robotic CW due to the square wave instead of a sinus wave but Attiny can not use the tone() function of Arduino and we use a DIY simple function: maintaining 625 Microseconds High and 625 Microseconds Low a digital pin.
Below at Software you can find the scketch and instructions of programming the Attiny
WLC-TX1 433 Mhz ASK transmitter
Working voltage: 1.3V-9V
Current: 9mA (1.3V). 135mA (9V)
Working temperature: -30 to 75 degrees
Working frequency: 433.882MHz
Transmit power: 7dBm (1.3V)
17dBM(3.3V)
27dBm(9V)
Data rates: 0-10Kbps
Dimensions and Weight: 15 x 11.6 mm and 0.52 gram
A unipole antenna made by Aluminum Tig welding filler
Diameter: 1.6 mm
Lenght: 330mm
3V CR2450 Li-Mn battery.
"CQ CQ MUFFIN2 FROM SERVET3. RX? PSE SND QHA QTH QTR INFO@AIRBOX.SPACE, TNX 73, AR"
That means "General call, General Call MUFFIN2 from SERVET3, if received please send your id, position and time to info@airbox.space, thank you and best regards, message end"
Pulsando este link os podéis descargar el scketch del aTtiny muffindos.ino que grabamos en el microcontrolador. Tambien podéis encontrar las instrucciones de cómo instalar el scketch en el Attiny usando de pasarela un Arduino.
Scketch
Instrucciones de instalación
Just a UHF Yagi vertical antenna with SDR or UHF receiver and FLdigi or similar Software to read CW.
La señal a 433 mhz tiene el problema de ser una frecuencia muy congestionada, por lo que solo con antenas muy direccionales y apuntando en vertical se puede apreciar la señal emitida.
En general los resultados demostraron que no hubo una buena señal de salida.
Por lo que para próximas misiones se probará de mejorar la antena.
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