G4HUP Direct Frequency Synthesis

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These pages are devoted to my recent project - a direct frequency synthesiser, to provide a GPS locked output for transverter local oscillators. This replaces the crystal oscillator with a signal source of similar quality, but without the drift associated with temperature variations seen with crystal LO's.



For an outline of the DFS process see August 2007 Midwest VHF-UHF Society Presentation



Currently the work has progressed to a dedicated PCB and a working sample which will be presented at MUD 2007. See this flyer for the latest information.

Click here for October 2007 MUD DFS presentation and here for the Proceedings paper


Here is the November 2007 Martlesham Microwave Round Table paper.


For DFS documentation follow the links at the top of the page. Note that all current DFS supplies are for the Issue 2 PCBs. References include design guides and worksheets, filter and frequency schema information, construction notes, Technical Manuals and bill of materials etc.

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Page created 17 Oct 2007

Page last updated 18 Jun 2009