What’s On

We meet Tuesday evenings 19:45 for 20:00, Thursday mornings 10:00 and Sundays 14:00. Tuesdays and Sundays are hybrid in person and Zoom meetings (Join us in person or using zoom, code 867 3049 5863) Thursday mornings are exclusively in person, see schedule below or  contact us for more details.

Event Information:

  • CDG2000 Front End Board

    The CDG2000 Front End Board

    This is the first module in the transceiver, and one of the critical ones. It contains the attenuators, switched bandpass filters, H mode mixer, roofing filters and TX/RX switching. It is controlled by means of an I2C interface, details of which are available from Philips semiconductors.

    Here you can download an early version of the article submitted to RadCom, the PCB artwork, pictures of the performance and supporting material.

    Note that this version of the front end uses a 74AC74 in the mixer to generate the clock.

    Early version of article Hi res picture of top of board Hi res picture of bottom of board
    Performance data PCB  Parts List
    Schematic part 1  Schematic
    part 2    		   Schematic
    part 3
     Schematic
    part 4    		    

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