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Building an Operating Impedance Bridge   -  -  -  -  -  -  -  -  -  -  
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Building a RF Injection Generator for the Drake R4C Receiver -  
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Building an Operating Impedance Bridge for 160 to 6 Meters

This is a 1981 to 1985 Radio Amateur's handbook construction
project.
A Variable Speed Code Study Program --  QST Magazine
An audio tape recorder speed controller and audio regeneration
circuit.
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