26th April 2011
Circuit diagram of the wireless power TX used in the video demonstration.
Parent article: Wireless Power Experiments.
12th May 2010
More compatible receivers and a few circuits related to the system.
7th February 2010
I build a variant of Roger G3XBM's latest experimental transceiver, the XBM80-2.
23rd January 2010
A low-speed data link implemented using Pierce quartz crystal oscillators controlled by a microcontroller.
Contains 1 sub-article.
6th March 2009
I implement sequential multi-tone Hellschreiber modulation in the 30 metre QRSS beacon.
Parent article: 30 Metre QRSS Beacon.
24th February 2009
I finally sit down and calibrate the front-panel controls of the QRSS beacon.
Parent article: 30 Metre QRSS Beacon.
11th October 2008
I finally get around to writing up the circuit diagrams from this old experiment.
Parent article: AM Walkie-Talkie Experiments.
16th August 2008
I complete and box-up the QRSS beacon, and experiment with a vertical antenna.
Parent article: 30 Metre QRSS Beacon.
10th August 2008
I get a basic QRSS beacon going on 30 metres.
Contains 3 sub-articles.
13th July 2008
I finally rig up a vertical antenna for my 80 metre CW beacon.
Parent article: 80 Metre CW Beacon.
29th June 2008
I put the 80 metre beacon in a box and do some more work towards an antenna for it.
Parent article: 80 Metre CW Beacon.
21st June 2008
A simple 1.5 Watt Morse beacon for 80 Metres.
Contains 3 sub-articles.
27th April 2008
More progress on the PSK-31 beacon.
Parent article: PSK-31 Beacon Mark 1.
20th April 2008
Prototype PSK-31 Beacon Keyer.
Contains 1 sub-article.
29th March 2008
A prototype tone-coded multi-channel remote control system.
23rd March 2008
Various toy AM transceiver circuits on 11 metres.
Contains 1 sub-article.
1st March 2008
Building a toy VHF phone transceiver for 3 metres using only one transistor for both TX and RX!
26th May 2007
A very simple 2 metre AM transceiver from Roger Lapthorn G3XBM.
3rd March 2007
The circuit diagram for the transmitter so far.
Parent article: "2007 80m Homebrew Challenge".
25th February 2007
I put the 4 Watt exciter in an Aluminium box.
Parent article: "2007 80m Homebrew Challenge".
24th February 2007
IRF510s arrive and I build a TX power-chain.
Parent article: "2007 80m Homebrew Challenge".
18th February 2007
I go to the CCARC field day and think about different RX topologies.
Parent article: "2007 80m Homebrew Challenge".
17th February 2007
I get the TX talking to the RX and true First-Light for the Receiver.
Parent article: "2007 80m Homebrew Challenge".
5th February 2007
I build the AM exciter, including crystal oscillator and speech amp.
Parent article: "2007 80m Homebrew Challenge".
31st January 2007
I decide on low-level AM modulation, design and breadboard an AM modulator.
Parent article: "2007 80m Homebrew Challenge".
28th January 2007
Clarification on the Challenge requirements means a completely different approach.
Parent article: "2007 80m Homebrew Challenge".
24th January 2007
I complete a 1 Watt DSB transmitter lash-up.
Parent article: "2007 80m Homebrew Challenge".
22nd January 2007
My study of the VE7GC "Wee Willy" 80 metre DSB transmitter power amplifier.
13th January 2007
My work towards the ARNSW Homebrew Group's "2007 80m Homebrew Challenge" transmitter project.
Contains 11 sub-articles.
13th January 2007
I first read about the challenge on the ARNSW website.
Parent article: "2007 80m Homebrew Challenge".
11th November 2006
A simple filter-based SSB exciter. Still work in progress, but will some day become an SSB transceiver.
19th October 2002
My implementation of SM0VPO's cute little QRP linear amplifier.
25th November 2001
Harking back to my old days as a FM broadcast pirate, I whipped up this very simple 500mW transmitter.
25th March 2000
2HoT FM, my pirate radio station in high school.