G4HUP Direct Frequency Synthesiser Documentation

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General Documentation:

DFS Design Guide

DFS Schema for DEMI Transverters

DFS Schema for DB6NT Transverters

How to rewind Toko 10K coils

Pi Attenuator resistor values

DFS Filter page - Information on all proven frequency schema and approriate filters

Documentation for Issue 1.0 PCB's:

DFS Design Worksheet for developing new DFS implementations

DFS Frequency Calculation worksheet an aid for proving multiplier/divider and mixing products. This example is pre-loaded with the data for the 101.75MHz DFS version, but everything can be overwritten

DFS Construction Notes

DFS Manual, including circuit schematics and parts placement diagrams

Click here for Errata and updated information

Notes on different Frequency Schema versions

DFS Bibliography

Here are some documents and links to other published amateur DFS articles:

WA1ZMS 89.16667MHz DFS

G4DDK 96MHz DFS article from UK Microwave Group 'Scatterpoint' magazine, Feb 2006

WW2R/G4FRE dual output DFS for 90 and 96MHz

F9HX's DFS article from VHF Communications, 2/2005. Published here with Andre's, F9HX, consent

F9HX DFS Manual. Again, published with Andre's consent - an interesting alternative implementation of a DFS.

K3SIW's 122.25MHz DFS for 47GHz Another alternative implementation, using digital mixing for the LF signals. Published with Garry's, K3SIW, permission

Note: Any queries on any of these papers should be directed to the original authors please, not to me!


Page created 20 Oct 2007

Page last updated 18 Mar 2008