KB9YIG.com - SoftRock SDR

The SoftRock RX Ensemble II Receiver Kit includes the components for building the kit for LF, 180kHz through 3.0 MHz, operation or for HF, 1.8 MHz through 30 MHz operation. A second 74AC74 position provided on the circuit board gives an additional division by 4 on the Si570 clock signal for LF operation. For HF operation the second 74AC74 is not mounted on the board and an HF jumper is installed to route the Si570 clock signal directly to the 74AC74 that is used for quadrature clock generation.

The SoftRock RXTX Ensemble Transceiver Kit provides a 1 watt SDR transceiver that can be built for one of the following four band groups: 160m, 80m/40m, 30m/20m/17m or 15m/12m/10m. Components are included for all four options and can be assembled at the builders choice. The kit combines the functionality of the prior SoftRock v6.3 RXTX+Xtall Transceiver Kit, the USB I2C Interface Kit and the PA Filter Kit on a single circuit board with connectors along one edge for easy access.

20m SoftRock_40_R receiver Kit   

The 20m version of the revived SoftRock-40 design is a small SDR receiver powered via a PC USB port. An active filter on the SoftRock_40_R circuit board greatly reduces center frequency noise that would otherwise be present due to the USB port power source.

The Delta 44 Interface Module plugs into to the Delta 44's 15-pin connector and provides four 1/8" stereo jacks for audio inputs and outputs to/from the sound card. RF filtering is included on the module board and jumper positions are available on the module board for experimenting with channel ground connections to minimize center frequency noise.