Murray Greenman CSc ZL1BPU/ZL1EE
Waiuku, Franklin, New Zealand [RF72is]

This web site is mostly about new, different, and specialized radio communication modes. The emphasis is on modes which I have influenced in some way during development. There are digital chat modes and visually readable modes for LF, HF and VHF.

There is also a section on propagation studies, and some fascinating micro-controller projects to build. The site also hosts Amateur PC software developed by Con Wassilieff ZL2AFP/ZL2EE.

New - My Comms Receiver Collection, with photos! <- Click here

- CMSK for LF/MF -

LF/MF CMSK reception
A specialized weak signal system for the lower phase stable bands (2200m, 600m and 160m), where QRN and man-made interference are the biggest problems. This is a sophisticated high performance narrow-band DX system.

- Fuzzy Modes -

Hellschreiber reception
The modes described here are visually readable, rather than interpreted by electronics or computer. Although some of the modes are new, the idea isn't, and all are fascinating. This is the acknowledged premier site for Hellschreiber techniques.
Introduction     Feld-Hell     PSK- & FM-Hell     MT-Hell

- MFSK Modes -

A robust multi-tone FSK mode
Most of these modes are for conversation between two or more Amateurs. The emphasis is on performance, especially with low power or under poor radio conditions. This is the official source of MFSK16, DominoEX, EXChat and WSQ documentation.
Introduction     MFSK16     DominoEX     EXChat     WSQ     FSQ & FSQCALL     MEPT-JT

- NBTV Modes -

Narrow Band TV is similar to SSTV, except that sequential frames are transmitted, and the emphasis is generally on speed (in order to provide realistic motion) rather than image resolution. Several different and highly successful full colour modes are presented.
Introduction     Analog OFDM NBTV     Digital NBTV     Hybrid FM NBTV

- The Ionosphere -

Peter G3PLX's Chorp Sounding
An extensive introduction to ionospheric propagation. A small collection of techniques and ideas to assist understanding and monitoring of ionospheric propagation. The techniques include passive chirp sounding, PN ranging, narrow-band digital and carrier frequency Doppler analysis.
Introduction     Chirp Sounding     Precision Carrier Analysis     Ranging Techniques     Digital Propagation Logging

- Software -

ZL2AFP and Zl1BPU software
Here you will find the most complete collection of radio software from Con ZL2AFP, including CMSK, DominoEX, the Narrow Band TV modes, and a collection of useful utilities. There is also a selection of utilities by Murray ZL1BPU.
Introduction     Clicklock     CMSK for LF/MF     DominoEX
    MSK-Hell for LF/MF     Narrow Band TV     PSK Sounder     MEPT Tools     FSQCALL

- Other Projects -

ZL2AFP and Zl1BPU software
My Communications Receiver Collection - receivers from 1924 to the present day, a collection you can browse on-line or visit in person!
Receiver Collection

Adaptations for surplus high stability Rb references; recycling crystal-controlled HF SSB radios for Amateur bands; transmissions for investigating radio propagation; my MEPTs in detail.

Rubidium Synthesizers     Recycled Radios     ZL1EE MEPT Transmitters
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- Documents and Publications -

Selected Amateur Radio related documents by ZL1BPU.

To visit any of these areas, click on the titles, links or pictures.

Copyright Murray Greenman 1997-2017. All rights reserved. Contact the author before using any of this material.

These pages have been written using a simple text editor, for minimum file size and maximum speed.
I believe web pages should be simple, clear, quick to load and easy to use. For bells and whistles look elsewhere.
Most recent update 26th March 2017.

My thanks to the folks at QSL.NET for hosting my stuff.