[sdiy] frequency shifter

Gordonjcp gordonjcp at gjcp.net
Sat Mar 14 13:51:56 CET 2020

On Wed, Mar 11, 2020 at 09:58:36PM -0700, David G Dixon wrote:
> Also, the phase displacement network is not protected material.  It is well known.  That’s why there is a nice piece of software on the web for designing them (QuadNet from Tonne Software: www.tonnesoftware.com <http://www.tonnesoftware.com/>  ).  Also, there is a very good writeup of the whole Bode frequency shifter concept in Electronotes, although I’m not sure if it’s in the “public-domain” part of Electronotes or the part you have to buy from Bernie.  I had a complete collection of Electronotes for a while, and read all about it.  I chose not to use most of the suggested circuitry, but the concepts and ideas were all there. 

If you want to see how to use a dome filter and some ring modulators to make a frquency shifter, any 1970s-1980s RSGB handbook will give you a fine set of circuit diagrams for a phasing-type SSB exciter.


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