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ข้อสอบ US Exam

3rd Public Domain Release of 2016-2020 Extra Class Question Pool

March 5, 2016

The NCVEC Question Pool Committee has released the 3rd version the FCC Element 4,Amateur Extra Class Question Pool originally released originally January 8, 2016

Public Domain Question Pool Files for Download have been replaced with NEW filesthat includes a 2nd […]

โปรแกรม Voice Activate Recorder ที่น่าสนใจ

ที่มา: https://www.snooper.se

LoRa WAN

LoRaWAN is a protocol designed for creating large-scale public networks; the technology allows for sensors to talk to the internet without 3G or WiFi. Community crowdsourced projects, such as The Things Network, aim to provide access to this technology by deploying gateways globally that others can freely connect to.

The purpose of this Instructable […]

ตั้งความถี่ MT1000

CH ความถี่ อธิบาย Power 1 144.725 ศรีสะเกษ H 2 144.9375 E20AE,RAST L 3 145.7125 Repeater SSK H 4 144.900 แจ้งเหตุ H 5 145.000 ช่องเรียกขาน H 6 145.7750 Echolink SSK L 7 144.625 ศรีสะเกษ-กล้วยไม้ H 8 144.850 ศรีสะเกษ850 H 9 147.000 ศรีสะเกษ7 H 10 162.800 อพปร. H 11 152.850 โพธิ์ทอง H 12 144.425 SSTV L […]

Raspberry Pi เป็น Mumble Client

ทำ Raspberry Pi เป็น Mumble Client และมีปุ่ม Push-to-Talk ในตัว

ที่มา:

https://github.com/dchote/talkiepi http://projectable.me/i-built-a-wifi-walkie-talkie-for-my-kids-now-you-can-too/ http://projectable.me/building-an-internet-walkie-talkie-using-a-raspberry-pi-v3/

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.

[…]

Building an APRS iGate using a Raspberry Pi and a TV tuner dongle

I’ve been messing around with APRS – the Automatic Packet Reporting System – for some time now and had noticed an absence of coverage in my local area. The end goal of APRS is to feed packets (which might be position data, weather reports, messages or other information) to the APRS-IS (which can be […]

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

[…]

VHF BEACON AND APRS TRACKER

VHF BEACON AND APRS TRACKER (ENGLISH VERSION) 29/06/2015f4goh

This little low cost FM transmitting card can be used for different applications, like:

APRS Tracker APRS WX station APRS for sounding balloon Fox hunt Beacon for emergency exercice

Most of the time , the transmission of an APRS signal is AFSK , that is […]