Publications
Weak signal modes on the Microwave and 3400 MHz Bands
Presentation at Martlesham Microwave Roundtable 2009 -
6dB Better than CW Weak signal modes and how they work. A updated version of the
presentation given at the RSGB Convention 2012
Using GPS in Amateur Radio
GPSRadiotalk
Software Defined Radio
The basics behind SDR techniques.
Using PICs in Am Radio Presentation at Finningley Microwave Roundtable July 2011
21st_Century_Radios Presentation at Martlesham Microwave Roundtable April 2012
Modern Synthesizers Presentation at RSGB Convention, 12 October 2014
137 and 475kHz, The Experimenters' Bands Presention first given to Itchen Valley Club March 2016
Third Method Upconverter for LF/MF Presentation at RSGB Convention October 2017
Sites, Heights and Locators. Presentation at Crawley Microwave Roundtable Sept 2018
24GHz Beacon using Direct I/Q Upconversion.Presentation at Crawley Microwave Roundtable Sept 2019
Several good articles on SDRs, I/Q processing and DSP can be found on the links page
Problems often Encountered with USB Soundcards on a PC
10GHz PLL Low Noise Block phase noise tests on a new generation
LNB suited to narrow band modes
The WSPR ,
JT4 ,
JT9 and
and ISCAT Coding Processes
Position Reporting using WSJT Modes Using Weak signal modes to
transmit high resolution positional data. Lat/long from GPS data is compressed into a WSJT compatible message
and sent using JT4 or JT9 modulation. This article appeared in RadCom Plus September 2015
WSPR S/N Test Results
Too low a receiver bandwidth gives false reported S/N values.
Index to RadCom Data columns
List of Maximal Length Shift Register taps
KST2ME Primer for Microwave Talkback
Tutorial on Galois Fields and Binary Polynomials If you're confused by these trying to understand CRCs, Error Correction and coding theory, this might help.
How GPS derived timing can be used for new data modes and for accurate frequency control.
This article first appeared in Radio Communication April 2006
Presentation given at the RSGB HF Convention October 2005
A presentation given at the HF Convention in 2002
(Some hardware details are a bit are out of date now)
SDR-IQ Linearity Tests
A short note describing the results of some two and three tone measurements on the RF Space SDR-IQ wideband
digital receiver. Alhough only a quick and simple measurement, they show clearly that the concept of Third Order
Intermodulation Product (TOIP) applied to wideband receivers is completely flawed.
First published in Scatterpoint April 2013
Amateur Use of Novel Signalling Methods at Low Frequencies
A poster presented at The IEE Conference, London on 24/25 October 2002 entitled
"Getting the Most out of the Radio Spectrum"
Wolf Coding Process Weak Signal mode based around strong error corrected BPSK
Index to RadCom Design Notes and Short Circuits columns
Really ought to credit someone with this, but can't remember where it came from, or find the URL