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TRANSMITTING FM, AM, SSB, SSTV AND FSQ WITH JUST A RASPBERRY PI

Previously we posted about the Raspberry Pi’s ability to modulate one of its pins to produce FM transmissions with PiFM. A developer (F5OEO) has recently expanded on this idea, and now the Raspberry Pi is capable of modulating and transmitting FM, AM, SSB, SSTV and FSQ signals anywhere between 130 kHz to 750 MHz.

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KISS TNC by m0pzt

Projects : KISS TNC Most of this project is based-upon the firmware from Mobilinkd but some discrete parts and some soldering (or breadboard) is required to get things working. By re-flashing an Arduino-compatible microcontroller, it’s possible to turn it into a KISS TNC for use with APRS/AX25. Depending upon where you get your ‘duino […]

Arduino Multiband Beacon

Arduino Multiband Beacon INTRO http://blog.dxers.info/2016/01/been-playing-around-with-39usd-arduino.html 144 MHz (2 meters) http://blog.dxers.info/2016/01/arduino-uno-si5351a-breakout-as-144.html 432 MHz (70cm) http://blog.dxers.info/2016/01/arduino-uno-si5351a-breakout-as-432mhz.html 902 MHz http://blog.dxers.info/2016/02/arduino-uno-si5351a-breakout-as-902mhz.html TESTS http://blog.dxers.info/2016/02/etherkit-si5351a-beacon-and-another.html MULTI-BAND Operation (successful) http://blog.dxers.info/2016/02/arduino-tinkerkit-etherkit-si5351a.html 5-BAND Operation (TESTING) http://blog.dxers.info/2016/02/arduino-tinkerkit-etherkit-si5351a_9.html

 

ที่มา: http://blog.dxers.info/p/arduino-multiband-beacon.html

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แปลง Raspberry PI ให้เป็น เครื่องส่งวิทยุ

Learn how to build a FM Radio Transmitter using a Raspberry Pi. This little hack doesn’t need anything much other than the Raspberry Pi and a Jumper cable. It allows you to transmit any audio content through the Raspberry Pi. Building this Raspberry Pi Radio Transmitter wouldn’t take more than 15-20 minutes to set up […]

Raspberry Pi ส่งภาพจากกล้อง ด้วย SSTV

ติดตั้งกล้อง

 

การ Capture รูปจากกล้อง (โปรแกรม raspistill ติดตั้งมาแล้ว)

raspistill -t 1 –width 320 –height 256 -e png -o /tmp/image.png

 

การเพื่ม Callsign ลงในรูป

mogrify -pointsize 24 -draw “text 10,40 ‘E27AF’” /tmp/image.png

ต้องติดตั้ง mogrify ด้วยคำสั่ง

$ sudo apt-get install imagemagick

 

เตรียมการส่ง

./pisstv /tmp/image.png 22050

จะได้ไฟล์ .wav สำหรับส่งออกด้วยเสียง

 

ต้องติดตั้งโปรแกรม pisstv เพื่อทำการแปลงรูปให้เป็นสัญญาณเสียงในรูปแบบของ sstv ก่อน

download ได้จาก […]

D-Star Repeater

Converting a D-Star Hotspot to a Full Duplex Repeater

If you have a gmsk modem and put up a D-Star Compatible Hotspot, it is quite easy to convert this simplex system to a full duplex repeater that supports DPlus linking to other repeaters, reflectors and often to Hotspots, DVAPs and DV Dongles. With other […]

D-star Hotspot

What is it?

D-STAR Hot Spot is software for Windows that creates a D-STAR ‘point of presence’ (or hot spot) utilizing an analog radio and a GMSK node adapter. The hot spot creates RF access to the D-STAR network where none previously existed. With a hot spot set up, you can use your D-STAR […]

D-Star UT118

UT-118 สำหรับ IC2200T

ที่มา: http://www.hamsiam.com/smf/index.php?topic=211474.0