Murray Greenman CSc ZL1BPU/ZL1EE
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.
Waiuku, Franklin, New Zealand [RF72is]
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 weak signal mode for LF/MF!
<- Click here
My Comms Receiver Collection
A collection of classic receivers from 1924 to today, with descriptions, photographs and other information.
- CMSK for LF/MF -
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 -
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.
PSK- & FM-Hell
- MFSK Modes -
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.
WSQ & WSQCall
FSQ & FSQCall
- 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.
Analog OFDM NBTV
Hybrid FM NBTV
- The Ionosphere -
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.
Precision Carrier Analysis
Digital Propagation Logging
- 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.
CMSK for LF/MF
MSK-Hell for LF/MF
Narrow Band TV
- Other Projects -
My Communications Receiver Collection - receivers from 1924 to the present day, a collection you can browse on-line or visit in person!
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.
ZL1EE MEPT Transmitters
- 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 20th November 2017.
My thanks to the folks at for hosting my stuff.