G0MRF Projects
Web-Site
Amateur radio projects from 73kHz to 447THz
Left: An
old favourite revised with modern SMD coils. Ready built preamp for 136kHz
and a new version for the 472kHz band.
Middle: A
300W Class D Amplifier for 630m. Includes over current and hi ref
power protection
Right: A 5W
linear amplifier for 136 or 475kHz. (70k - 2MHz)
England
to Canada on 136k 4300km crossband
Quarter kilowatt linear amplifier
for L.F.
A 100W
LF Class D Amplifier from 13.8V
500kHz experiments.
LF
- HF Reflection Coefficient Bridge
300 Watts on
136kHz. A class D TX. (Jan/Feb
2003 Rad Com)
300 Watts on 472kHz
/630m with over current and SWR protection Kit
available
A broadband 5Watt
linear amplifier for 136 and 475kHz
Kit now available
09/2018
AMSAT
Oscar 40. Worldwide satellite communication
Helix dish
feed kit for 2.4GHz
Gemini :
S Band to 10m converter with 0.6dB NF
Laser
transmitters / Receivers - 6 pages updated
LF
PreAmp and BPF. Make your black box work on
LF and MF. New
Version. Feb 14
LF
On-the-Air Antennas,
Photo's, Coil's etc
L.F. Dx-pedition to the Isle of Man.
VSWR Bridge for LF
Forward and reverse power at a glance
Where a project has been published, the original
text is reproduced.
Up to-date developments / modifications to circuits are also included.
Recent additions:
300W Amplifier for 472kHz / 630m - A
2016 design using 2 FETs in push pull. Ideal for WSPR beacons and CW QSOs
A 5Watt linear amplifier that works from 70kHz to 2MHz. Ideal for that low
level from your Kenwood Icom or SDR Radio
The ESEO project. An inside view from an AMSAT perspective on this 49kg
satellite from ESA Education
Thanks for visiting the site, I hope you
enjoy it.
If you have any questions or comments please e-mail
73
David Bowman G0MRF Site last updated 19th/November/2018