Amateur radio projects from 73kHz to 447THz

FUNcube: An exciting cubesat project from AMSAT-UK

          I'm Rachel, read about how you can help Wimbledon Greyhound Welfare            

Special feature: Not amateur radio, but a charity that finds homes for retired greyhounds. Click the picture of Rachel to read a little more about these affectionate animals and the work of Wimbledon Greyhound Welfare.

Crossing the Atlantic the hard way     England to Canada on 136k    4300km crossband 
A linear amp for LF     Quarter kilowatt linear amplifier for L.F. 
More LF transmitters       A 100W  LF Class D Amplifier  from 13.8V
 CW / PSK beacon and antennas        500kHz experiments.
Match that antenna in seconds       LF - HF  Reflection Coefficient Bridge
As shown on the RSGB LF source book        300 Watts on 136kHz. A class D TX. (Jan/Feb 2003 Rad Com)
Oscar 40        AMSAT  Oscar 40.  Worldwide satellite communication
Build a dish feed the easy way        Helix dish feed kit for 2.4GHz
Gemini        Gemini :  S Band to 10m converter with 0.6dB NF
No long antennas at 670nm !       Laser transmitters / Receivers - 6 pages updated
Kit and component pricelist     Kits and components Index.
LF FET preamp        LF PreAmp and BPF. Make your  Japanese black box work on LF. New Version
LF in practice     LF  On-the-Air   Antennas,   Photo's,  Coil's etc
Winter by the Irish Sea       L.F. Dx-pedition to the Isle of Man.
VSWR       VSWR Bridge for LF    Forward and reverse power at a glance
direct digital synthesis       DDS Drive for 136k    AD9832 from  SM6LKM - (Mk2)
Build your own rocket       Coke Bottle Rocket Demo   A nice demo to turn a Coca-cola bottle into a rocket.
QRSS slowww CW       Slow CW    Work signals under the noise with your P.C.
Build a variable inductor       Variometer  250 - 400uH  built on standard fibreglass tubes. 
Drake 2880 modifications     Drake Mod's  A Series of modifications for the Drake 2880 S-Band converter
Receive converter 2.4G to 432 MHz    Satellites     An S-Band to 70cms converter for Phase 3D
satellites    Satellites      C Band transverter and dish feed for Phase 3D - Ooops!  No RX.....or AO-40
satellites    Satellites      AMSAT-UK and the SSETI Express project. U/S transponder
satellites    Satellites      A demonstration mode U/V transponder   7/05
Poor performance receiving U Band? - This is for you.    Satellites      High performance pre-amp for 70cms++  8/05
A rainy night in London......another satellite idea.    Satellites      Crazy satellite idea:  Medium Earth  Orbit at 7400km   10/05
2.4G source in 15 minutes    2.4 GHz Source    An all new source with a kit from AMSAT-UK. 
Where's my airline ticket?    DX-peditions.    Did you work us?    See the cards here

Where a project has been published, the original text is reproduced.
Up to-date developments / modifications to circuits are also included.

Recent additions:
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.
500kHz : An experimenters band in the UK.  - See pages on a 3 mode beacon and antenna experiments.
      

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If you have any questions or comments please            e-mail     

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David Bowman   G0MRF                           Site last updated                    24th/February/2011