Hi Lyle, I was looking at this. I think the files are also in Files > Si570 > LPT1. This is Guido's (PE1NNZ) parallel interface.
However, I would think a better parallel port interface would employ opto-isolators. Opto-isolators will prevent a potential source of ground loops. I took a quick look for opto-isolators and found some parts that are logic level compatible at the output at-least and fast enough to handle 400kbps I2C, I think they were from NEC. Can anyone suggest ideal parts for isolating the parallel port for Guido's interface? 73's, David --- In [email protected], "Lyle Koehler, K0LR" <[EMAIL PROTECTED]> wrote: > > 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 >
