Si5351A 160m-17m VFO Kit for the QRPGuys DSB Digital Transceivers
Si5351A VFO Kit – $30
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Add this module for additional digital modes without buying crystals!
Steve Weber (KD1JV) has designed a PLL synthesized vfo kit (160m-17m) the popular DSB Digital Transceiver kit that utilizes the Si5351A PLL clock generator chip, with a single chip Atmega328P µP for control, featuring a five digit LED frequency readout to 10Hz resolution. Simply set the band and frequency with the onboard push buttons. No need to source crystals for communicating using the digital modes. This kit contains all the components and hardware for the vfo to mount on our existing digital transceiver pcb, or if desired using the four corner holes, mount remotely in your custom chassis. The Si5351A clock chip is the only SMD component, all others are through hole. The pcb is 3.95″ (100.3mm) x 1.55″ (39.4mm), and mounts directly on top of the existing transceiver board, with the included hardware, still retaining the access for the band modules. Power consumption is about 40mA. With the addition of the vfo, you remove the crystal from your current band module, but retain the needed low pass filter components, then connect the minimal power needed for the module, and output of the Si5351A via pads on the main board. As a starting point, the VFO is programmed with the FT8 frequency for 160m-17m so that additional bands can be added beyond the 40-30-20 mix currently supported using crystals. To use, power up and set the digital readout to the specific frequency for your mode. On a scale of 1 to 5, 5 being the most difficult, this is rated as a 3-4 due to the SMD chip. The normal tools required are a soldering iron with a small tip, rosin core solder, small side cutters, small phillips screwdriver, and some Solder Wick® if needed. Allow a couple of hours to build, depending on your experience.