I'm happy to report that my Lite+Xtall v8.3 receiver kit is up and running, both with the 12F683 on-board controller and with a "modification" to allow parallel-port control. Actually no modification to the v8.3 board is required -- the parallel-port control interface is on an 8-pin header that gets plugged into the socket in place of the 12F683. In addition to the header, the only components required are two FETs and a DB25 connector. A schematic of the interface is included in Guido's PowerSDR-sr40 Installation Manual (http://powersdr-sr40.sourceforge.net/). I used 2N7000 transistors in place of the BS170 parts shown in Guido's diagram. The 10k pullup resistors R1 and R2 are not required, because there are already pullups on the v8.3 board. Here is a verbal description of the interface wiring which will have to suffice until I get around to posting a diagram to the Files section.
The source leads of both FETs are tied to ground (pin 8 of the header). One FET has its drain connected to pin 2 of the header and its gate going to pin 3 of the DB25 connector. The other FET has its drain connected to pin 3 of the header and the gate tied to pin 2 of the DB25 connector. Pins 12, 13 and 25 of the DB25 connector are connected to pin 8 of the header. With the 80/40 BPF filter board plugged into the v8.3, I'm able to listen anywhere on 80 or 40 and to everything in between, using PowerSDR-sr40. In addition, I can check WWV at 10 MHz or listen to the stronger AM broadcast stations. So far the 80/40 BPF is the only one I've completed, but conditions on all the bands are lousy today anyway1 Lyle, K0LR
