- 2N3055 TRANSISTOR GAP 73 HOW TO
- 2N3055 TRANSISTOR GAP 73 FOR MAC OS
- 2N3055 TRANSISTOR GAP 73 SERIAL
- 2N3055 TRANSISTOR GAP 73 DRIVER
Excluding the Arduino-based interface and the use of an Si570 for the local oscillator, all other components are common and easy to find. However, I guess Ashhar Farhan, VU2ESE (of BITX fame), was thinking of “minimal” when he chose the name for his new design. The word “minima” in Greek stands for “message”. I sent a beacon from my VX-8GE and it instantly showed up in aprs.fi. After installation, I connected the modem to my Yaesu FT-60E and configured Aprx to forward all received packets to one of the APRS-IS Tier 2 servers. PA0ESH also has Aprx packages for more OpenWrt versions here. You can find it here, and in case you want to create one yourself, here are the necessary files. There was no “official” package readily available for OpenWrt 15.05, so I made one. Next, I needed Aprx – an IGate designed for embedded devices.
2N3055 TRANSISTOR GAP 73 DRIVER
The OpenTracker USB was recognized by the cdc_acm driver (part of the kmod-usb-acm package), which created a /dev/ttyACM0 device (as mentioned here). As a bonus, the modem could be powered by the USB port of the router (if I had the TL-MR3040 everything could run off batteries). A handheld radio, the modem, and the router would still make a very small package. However, this could be the smallest setup. A quick search revealed that KI6PSP, YP0NXX, DK7XE, and PA0ESH have done it already. I had to connect the OpenTracker USB to the USB port and run some APRS application on it. Running an IGate seemed a nice idea and I was not the first one to think so. Even better? The computer store across the street had one available in stock. For about 35 € you get Ethernet and wireless interfaces, a USB port, an enclosure, a power supply, and enough RAM to run OpenWrt. This modern-day incarnation of the WRT54G is smaller and cheaper than the Raspberry Pi. Of course they are supporting the Raspberry Pi as well, but one of their main platforms is the TP-Link TL-MR3020 (and its sibling, the TL-MR3040). Until a few weeks ago, I thought that everyone was using a Raspberry Pi for generic embedded applications nowadays, when I stumbled upon the PirateBox project. They were perfect for hundreds of applications – and it turns out that they still are. More than 10 years ago, these two devices cost less than $100, ran Linux, and were supported by a large community of users. It dates back to the Linksys WRT54G and NSLU2. The cheap embedded Linux device craze did not start with the Raspberry Pi. With an Arduino, you can also build a MicroModem. M0PZT has used an Arduino UNO clone to build the Mobilinkd TNC and has made a video showing it working at his site. A similar BeRTOS-based TNC is investigated by KI4MCW here, while a comprehensive list of Arduino-based TNCs and various implementations is provided by M1GEO here. A quick look at it’s source code reveals it is based on BeRTOS. The Mobilinkd TNC supports 1200-baud AFSK only. This time the TNC would hear incoming packets as well! I set Aprx to act as an IGate and set off on a car ride with my VX-8GE and a small external magnet antenna, to see if it could track me far enough. I changed cables to interface with the radio’s front headphone and microphone sockets. (Mobilinkd also provide a tool to monitor the input level.) I either needed some kind of amplifier, or to connect the input to the headphone or speaker output. I searched around the Internet and found that the output level of the radio’s data port is 100 mVolts peak-to-peak. I could send packets, but not receive a thing. On the other side of the TNC, I connected the TP-Link TL-MR3020 running Aprx, as described here. The first test was with the TNC connected to my Yaesu FT-897D’s data port.
2N3055 TRANSISTOR GAP 73 SERIAL
To flash the firmware, I used the avrdude binary included in the Arduino application and the following commands (adjust the serial port and firmware location if you use these): cd /Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin
2N3055 TRANSISTOR GAP 73 FOR MAC OS
The Arduino Nano clone uses the CH340G chip for serial communication, which required a driver for Mac OS X. I first sketched out a simple layout for the adapter board (the “shield” in Arduino nomenclature), and then soldered all the components on perforated board. While an original one costs over 30 € in Greece, I found a shop selling a clone for 5.5 €! If I had all the other parts required for interfacing with the radio, this project would cost me even less than 10 €. What is even more interesting, is that the Arduino Nano board, used in the example implementation, can be found at extremely cheap prices.
2N3055 TRANSISTOR GAP 73 HOW TO
At their site, one can also find the firmware for a simple, Arduino-based TNC, along with detailed instructions on how to interface the Arduino board with a radio. Mobilinkd make a nice Bluetooth-enabled TNC.
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