G4USP

Page last updated: 14/07/2014

 

Simple sensitive MSF receiver

 

    Detailed here within is a simple to construct whilst very sensitive 60KHz MSF receiver. It can be easily adapted to operate at 77.kKHz to receive DCF77 in Germany.

 

Design

 

Receiver description TRF  tuned radio frequency receiver.

    L2 / C11 forming an integral tuned ferrite rod type antenna tuned to 60KHz, followed by JFET Q1 providing pre-amplification whilst presenting a very high impedance to the tuned circuit of L2 / C11 and hence not excessively loading it. A further two stages of amplification are provided by IC2a & IC2b respectively before detection by D1. The detected RF signal then further processed by IC1a acting as a differentiator before passing through a low pass filter formed by R7 & C1 and finally being cleaned up by IC1b acting as a comparator.

    The recovered data stream is taken from L1 at TTL compatible levels, whilst a visual indication is provided by LED1.

 

        MSF Receiver schematic:

        MSF Receiver PCB component placement / layout:

          MSF Receiver PCB bottom trace:

            MSF Receiver components listing:

 

Original Files:

    Further to the details of the pages above - the original CAD files created using EAGLE PCB Design software are included below, along with associated PDF files of both schematics and PCB layouts suitable for printing directly.

    To use the original CAD files, they must be opened with EAGLE. Visit the CADsoft web site for more details, the software (including a freeware version), part libraries, tutorials, for EAGLE are available.

    Receiver schematic PDF

    Receiver PCB component layout PDF

    Receiver PCB bottom track pattern PDF

    Receiver EAGLE schematic

    Receiver EAGLE board

 

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