project 25

22 links

Two elements Telescopic Yagi for 2 Meters - A lightweight PVC hand-held telescopic 2 element 2m (145 MHz) yagi using two pairs of TV rabbit ear antennas as the driven and reflector elements. Approximate directional gain is 5dB.
[ Hits: 162 | Votes: 0 | Rating: 0 ]

KO4BB Tower Project - A 50' folding Rohn 25 tower project
[ Hits: 1177 | Votes: 1 | Rating: 9 ]

PL259 Antenna - A simple VHF quarter wave antenna from PL25
[ Hits: 542 | Votes: 2 | Rating: 9 ]

2.4GHz Cubic Quad Antenna ^pop - The Cubic Quad antenna is a commonly homemade antenna in the range of about 150 odd MHz. Our little project was to design one of these for use in the 2.4GHz range for 802.11 wireless LANs.
[ Hits: 37192 | Votes: 70 | Rating: 5.46 ]

The Conet Project - Recordings of shortwave numbers stations
[ Hits: 2167 | Votes: 1 | Rating: 10 ]

Receiving Cubesat Telemetry - How to easily receive and decode CubeSat telemetry
[ Hits: 148 | Votes: 0 | Rating: 0 ]

FT817 Amp Project - How to build a lightweight amplifier that can be backpacked around.
[ Hits: 1273 | Votes: 1 | Rating: 1 ]

Digital Speech Decoder - An open source software decode various xMBE based modes. It support decoding QPSK, C4FM modes such as P25 Phase 2 (TDMA), MotoTRBO, NexEDGE, ProVoice and others more.
[ Hits: 4303 | Votes: 48 | Rating: 5.44 ]

The WhereAVR - The WhereAVR is a small, lightweight, low-power, and low-cost APRS tracker with a full compliment of analog and digital I/O, as well as the ability to decode ax.25 packets. This allows for the reception of remote commands without the need for a real TNC.
[ Hits: 259 | Votes: 0 | Rating: 0 ]
extdigi - APRS Digipeater for Arduino - The project is an AVR ATMega328P based AX-25 1200 AFSK Digital Repeater, suitable for APRS digipeating
[ Hits: 801 | Votes: 3 | Rating: 1.33 ]

Ameritron AL-80A modification - W7TDC modification of the Ameritron AL-80A power amplifier
[ Hits: 11055 | Votes: 19 | Rating: 6.52 ]
HF Amp Project - This is the HF Packer amplifier project. KG9E was able to build this amp and put it on the air in about 25 hours.
[ Hits: 962 | Votes: 3 | Rating: 7 ]

AX.25 on Arduino - AX.25 Packet Modem homebrew project on Arduino
[ Hits: 637 | Votes: 1 | Rating: 1 ]

50Ah LiFePO4 battery - A LiFePO4 battery box build project made with 25Ah 3.2V LiFePO4 prismatic cells, 40A 4s1p BMS with Bluetooth, 10A Buck/Boost converter
[ Hits: 111 | Votes: 1 | Rating: 10 ]

S51KQ paradise - ATV, FM, Ax25 and more. Ham radio projects , pictures,... 80MB online
[ Hits: 3199 | Votes: 12 | Rating: 8 ]

U301 FET preamplifier - This FET preamplifier has been around for almost 25 years. It is extremely reliable and can handle several watts directly into either the input or the output without failure.
[ Hits: 8424 | Votes: 3 | Rating: 6.33 ]

80 meter Ceramic Resonator VXO CW Transmitter - Frequency agile 80 metre CW QRP transmitter. Ceramic resonators vary in the frequency shift obtainable. The one in the prototype of this article gave 3.525 to 3.558 MHz coverage.
[ Hits: 225 | Votes: 1 | Rating: 1 ]

The Fox - a 250mw transmitter - This FOX transmitter is equipped with a timer. It can be set to start transmitting up to 24 hours later by Joe Leggio WB2HOL
[ Hits: 384 | Votes: 1 | Rating: 1 ]

Raspberry Pi - Packet Radio BBS setup howto - This project describe how to setup a Raspberry Pi Linux system with a few AX.25 packet radio applications already installed on.
[ Hits: 691 | Votes: 3 | Rating: 9.33 ]
PiFox - Raspberry pi powered fox hunt transmitter. pifox is a script written by KM4EFP to configure, control, and deploy a Raspberry Pi as a fox hunt transmitter. No external radio needed use your Pi's gpio output as a radio transmitter.
[ Hits: 31 | Votes: 0 | Rating: 0 ]