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.
Right: A preamp kit for 432 to 1296 MHz. Suitable for applications above 432MHz.
to Canada on 136k 4300km crossband
Quarter kilowatt linear amplifier for L.F.
A 100W LF Class D Amplifier from 13.8V
LF - HF Reflection Coefficient Bridge
300 Watts on 136kHz. A class D TX. (Jan/Feb 2003 Rad Com)
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
Kits and components Index.
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.
Wideband pre-amp (70cms - 2.4GHz) New PCB design with green solder mask and grounded source inductors.
AMSAT-UK signal source. New version PCB with soldermask. - Ideal accessory for your FUNcube dongle SDR
Coke bottle rocket. A nice demo using alcohol vapour to turn a coke bottle into a rocket.
136kHz. A new version of the LF preamp. SMD coils and a double sided PCB
Thanks for visiting the site, I hope you
If you have any questions or comments please e-mail
David Bowman G0MRF Site last updated 10th/February/2014