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Posts Tagged ‘radio’

Two transistor superheterodyne shortwave receiver

Tuesday, March 3rd, 2015

Dilshan Jayakody writes: This is two transistor and two IF transformer based superheterodyne receiver which is designed to receive 13m to 41m bands. With quiet good external antenna this receiver performs similar to commercially available shortwave receiver and its audio quality is in very satisfactory level. This receiver can be...

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Posted in hacks | 7 Comments »

VHF Aircraft radio communications receiver

Monday, December 8th, 2014

Dilshan Jayakody published a new build, a VHF Aircraft radio communications receiver: This is simple radio receiver project which is capable to receive aviation radio voice signals which are transmit between 118MHz to 138MHz in AM (A3E). We got initial idea of this project by reading Sverre Holm’s (LA3ZA) article about...

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Posted in DIY | No Comments »

FBI radio teardown – Motorola Spectra

Tuesday, September 9th, 2014

KF5OBS did a teardown of a former FBI radio a Motorola Spectra: Tearing down a former FBI Radio, a 110 Watt FM / APCO25 (P25) VHF Motorola Spectra T99DX with DES hardware encryption module.

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Posted in Teardowns | No Comments »

RadioduinoWRT – a do it yourself webradio

Tuesday, November 5th, 2013

Raffael Herrmann wrote in to let us know about his latest project the RadioduinoWRT – a do it yourself webradio: In the last weeks I built a webradio by myself. It made from an Arduino, an hacked TP-Link WR703N router and some interface parts. It's fitted into a beautiful Yamaha enclosing and...

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Posted in Arduino, Interface | No Comments »

Bus Pirate script to recover bricked radio

Wednesday, July 17th, 2013

Koolatron over at the Bitcraze forum  re-program the Crazyradio over SPI using the BusPirate and this script, available at github:  I've knocked together a perl script to reflash a busted crazyradio over SPI using a Bus Pirate. This saved me from a firmware upgrade gone bad. Get an assembled Bus Pirate for $30, including world-wide...

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Posted in Bus Pirate | No Comments »

Futaba 10C radio hacked to accept a Spektrum DSM module

Tuesday, March 5th, 2013

Futaba 10C radio hacked to accept a Spektrum DSM module: Tom from Damage Designs has Hacked his Futaba 10C Radio to accept a Spektrum DSM Module. Turns out these were not designed to function together but with a bit of effort Tom got them to work just fine. The actual...

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Posted in hacks | No Comments »

iPod FM transmiter

Tuesday, December 6th, 2011

Electronics-DIY has instructions on how to build a simple portable FM transmitter that would allow your iPod to broadcast music over radio waves. It is simple to build and fits into a mouse case. It works quite easy, there is a power switch on the bottom to turn it on...

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Posted in DIY | No Comments »

7400 competition entry: AM radio

Friday, October 21st, 2011

Jason entered his AM radio into the Open 7400 Logic Competition: One unusual use for a logic chip is as an analog amplifier. Most logic with inverting outputs can be used this way. In order to demonstrate this functionality, I've built an AM radio with a 74HCU04 inverter. The inverters...

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Posted in 7400 contest | 1 Comment »

App note: Intro to digital communications systems

Saturday, March 12th, 2011

Digital modulation techniques are seeing increasing use worldwide. In the US, the FCC is actually mandating narrowband digital mobile radio (DMR) for certain Land Mobile Radio (LMR) users as explained in this Digital Mobile Radio Association white paper. Datasheets for various chips increasingly made reference to acronyms like GMSK, FSK...

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Posted in app notes, RF | No Comments »

Barcode challenge for radio operators

Monday, December 27th, 2010

Clearing out old posts before the new year, some of these might seem ancient. How to hand decode a QR code transmitted over HAM radio slow scan TV. Via Hack a Day. http://www.swharden.com/blog/2010-11-11-deciphering-qr-code-from-radio-spectrograph/

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Posted in hacks | 2 Comments »

Marine AIS data transmissions

Sunday, December 12th, 2010

If you live near naviagable waterways, you may want to tune your FM monitor receiver to 161.975 MHz and 162.025 MHz FM. If you hear data bursts, you are able to receive ships sending messages using the Automatic Identification System (AIS). These data transmissions are sent using GMSK modulation, and...

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Posted in RF | 1 Comment »

Peer to peer control network uses TV spectrum white space

Friday, December 10th, 2010

New patent application #20100309806 describes a peer to peer radio system designed to utilize the "white space" between TV channels. The system receives data from RF and geolocation sensors and processes them along with information from the FCC's white space database to assign operating frequencies on a dynamic basis.

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Posted in documentation, RF | 2 Comments »

Recent Comments

  • KH: So Romanians use old ICs too, a bit reminiscent of Dilshan's projects. I'm vaguely disappointed by the liberal use of float data and float calculations....
  • Max: This is of course no "0-30V" supply - the single-supply standard LM723 schematic can't go all the way down to zero, which is why I...
  • KH: A power-off current draw of 4mA for the Sony A6000 is a defect, product recall territory. It hits the camera battery with unacceptable wear and...
  • Olav Storstrøm: Please add 9-pin D-sub RJ45 and RJ12 connectors! Thanks!
  • KH: Hydroponics is like home automation. Every year you have folks who start projects like these and think it will take off and become a big...