Several days ago I devised a WSPR beacon which operates on 40 meter shortwave band. I had managed to devise it completely on the Raspberry Pi Pico microcontroller board, so precise frequency synthesis was carried out in C and Assembler programming languages. This...
I got my hands on an RTL-SDR a couple of years ago, and was thrilled at the amazing utility of these little devices. A simple $20 device and some free software (along with my desktop computer) gave me some of the functionality of much, much more expensive...
SBHT is based on the Analog Devices ADF7021-N Transciever and controlled by a STM32F4. Speaker and MIC circuits are on board to allow this data modem to also digitally transmit audio with various codecs either placed on the STM32F4 or off board AMBE...
With amateur radio, reaching out to people on the other side of the planet is no big deal. With the right antenna and favorable propagation conditions, hams can chat over thousands of miles using less power than a 40-watt light bulb. This relies on using...
Information on each of the stages: Bandpass Filter: three coupled parallel LC circuits based on W8DIZ BP filter design. RF Amplifier: 2N3904 single RC-coupled feedback amp based on VU2ESE BITX amplifiers. Mixer: Standard...
Motivation: I want to play with amateur radio digital modes (like FT8, WSPR, etc.). There are several software tools that can manage all the encoding/decoding, which use the soundcard to generate/receive audio waveforms, but I don't have a rig capable...
These days I came across an old Trio JR-500S ham radio receiver that was selling for $50 and bought it. According to the data I found on the internet, the device was manufactured in 1966 by the company "Trio", which after 1986 was known as Kenwood...
Royal Raymond Rife was a scientist, inventor and medical researcher. He is known for his microscopes, which he claimed could observe live microorganisms but also by an electronic device constructed by him called the Rife Machine, which according...
Tampa Hackerspace is a non-profit, membership-driven workshop. If you like making stuff, we’re the place for you. We provide equipment, classes, and mentoring for many types of projects. Some of the projects our members work on: aquaponics,...
Radu Motisan will be hosting the Hack Chat on Friday, September 7th, 2018 at noon PDT. Time zones got you down? Here's a handy time converter! Environmental conditions have a major impact on our well-being and productivity. Environmental...
NPR modems FOR SALE: https://www.elekitsorparts.com/product/npr-70 Low prices (79$ fully assembled). International shipping. Note for USA: Due to CFR 47 Part 97 FCC regulations, for the 70cm amateur radio band (restriction to 100kHz and 56kBaud),...
Step 1: find the datasheet for the PL2303. Not hard. It did occur to me that this is probably a counterfeit PL2303, because it was so ridiculously cheap, and it was possible that it didn't have a real DTR line. (Fortunately, it does.) Pray that it's...
I like flying high altitude balloons (HABs) . The normal mode of operation is APRS on 144.390 MHz and sometimes a secondary UHF APRS beacon is used. This is limited to 1200 baud and the available beacons can be heavy and/or expensive. ...
The CubeSat-class Spacecraft hardware has volume, mass, and power limitations more extreme than in other satellites. In fact, the CubeSat-class spacecraft is a Cube with dimensions 10cm x 10cm x 10cm, mass one kilogram maximum and the available power...
MorseMode is a hardware translator between (a subset of) ascii and international Morse code. It is mostly a "just for fun" project, but might have some limited practical application. A zipped copy of the current version of the project source code is...