19th March 2011
A simple direct-conversion receiver for the Homebrew Group challenge this year.
30th January 2011
A relatively unconventional but simple design HF spectrum analyser utilising a super-regenerative VHF IF for its log detector. Candidate utility category entry for the March 2011 555 Contest.
14th November 2010
A relatively simple 11 transistor FM broadcast receiver using pulse-integration discrimination.
11th June 2010
A semi-finalised implementation of the passive air-band receiver and field testing while I was travelling in the US.
Parent article: Non-Emissive Airband Receiver.
23rd May 2010
An experimental solid-state Fremodyne AM/FM Receiver for VHF.
12th May 2010
More compatible receivers and a few circuits related to the system.
24th April 2010
The guts of an AFL Sports Ears receiver, what you get for your money and how to build or buy your own compatible receiver for significantly less.
7th February 2010
I build a variant of Roger G3XBM's latest experimental transceiver, the XBM80-2.
4th February 2010
Adventures in measuring the selectivity of MCU-controlled super-regenerative quartz crystal controlled receivers. Resulting in a very useful selective log power meter.
Parent article: MCU Controlled Super-regeneration with Quartz Oscillators.
23rd January 2010
A low-speed data link implemented using Pierce quartz crystal oscillators controlled by a microcontroller.
Contains 1 sub-article.
14th January 2009
Another interesting Burkhard Kainka receiver circuit.
7th December 2008
Burkhard Kainka's super-regenerative FM receiver from Elektor September 2007.
12th October 2008
An absorption wavemeter for HF having fairly good sensitivity.
11th October 2008
I finally get around to writing up the circuit diagrams from this old experiment.
Parent article: AM Walkie-Talkie Experiments.
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!
4th February 2008
I add a front-end and a box to the 30 Metre Autodyne Receiver
Parent article: 30 Metre Autodyne Receiver.
27th January 2008
An interesting and quite useful autodyne receiver that phase locks the remote RF signal.
Contains 1 sub-article.
31st December 2007
A discussion on how non-linear systems produce harmonic and intermodulation distortion.
18th December 2007
I put the regen-o-reflexive receiver on 31 metres and put it in a box.
Parent article: Regenenerative-Reflexive Receiver.
4th November 2007
An interesting detector idea from PA2OHH.
Contains 1 sub-article.
8th September 2007
A simple minimum-component super-regenerative receiver for the FM broadcast band.
17th July 2007
A regenerative receiver based on an emitter-coupled oscillator topology of elegant simplicity but fairly average performance.
14th July 2007
Experiments with Charles Wenzel's "Passive Aircraft Receiver" circuit.
Contains 1 sub-article.
9th June 2007
My experiments with JFET biasing lead to a simple 455 kHz IF module.
19th May 2007
Some experiments with the Foster-Seeley Discriminator and the Ratio Detector.
15th April 2007
An 80 metre super-heterodyne SSB receiver built using BC556 devices only.
24th March 2007
A fairly small MK484 based receiver for the AM broadcast band.
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".
7th February 2007
I start building the RX side of things.
Parent article: "2007 80m Homebrew Challenge".
7th January 2007
A simple direct conversion receiver for 80 metres using a ceramic resonator VXO.
18th November 2006
My go at making a JF1OZL-style spectrum analyser for 40 metres.
13th August 2006
My implementation of Francis Hall's "Euro Set".
6th August 2006
A simple 3-transistor regenerative receiver from the MW broadcast band.
10th May 2003
A new VHF super-regenerative receiver designed specifically for the FM broadcast band. The design is IC-free, built from bipolar and field effect devices only.
6th April 2003
A simple VLF/ULF magnetic field probe for taking a quick aural measure of the local mains noise. It also works well as a cable-in-wall locator.
22nd December 2002
Demodulation of microwave radiation using a Neon plasma.
7th March 2002
A prototype implementation of the Charles Kitchin N1TEV super-regenerative receiver featured in the ARRL handbook.
18th November 2001
Small, peppermint tin sized, 80m receiver. Borrows the elegant WA6OTP PTO VFO.
27th August 2001
A simple tube/solid-state hybrid regenerative receiver for the AM broadcast band.